WO2013035519A1

WO2013035519A1 - All solid-state battery and method of manufacturing same

Info

Publication number: WO2013035519A1
Application number: PCT/JP2012/071047
Authority: WO
Inventors: 武郎石倉; 倍太尾内
Original assignee: 株式会社村田製作所
Priority date: 2011-09-09
Filing date: 2012-08-21
Publication date: 2013-03-14
Also published as: JPWO2013035519A1

Abstract

Provided are a method of manufacturing an all solid-state battery with which it is possible to cut a layered body with burr in a cutting face being alleviated, and an all solid-state battery which is manufactured by the method. The method of manufacturing the all solid-state battery comprises: a layered body forming step of forming a layered body of a non-sintered electrode layer which is a non-sintered body of at least either a positive electrode layer (1) or a negative electrode layer (3), and a non-sintered solid-state electrolyte layer which is a non-sintered body of a solid-state electrolyte layer (2); and a cutting step of cutting the layered body by projecting a laser having a wavelength of 266nm-810nm.

Description

All-solid battery and method for manufacturing the same

The present invention relates to an all-solid battery and a method for manufacturing the same.

In recent years, the demand for batteries as a power source for portable electronic devices such as mobile phones and portable personal computers has greatly increased. In a battery used for such an application, an electrolyte (electrolytic solution) such as an organic solvent has been conventionally used as a medium for moving ions.

However, the battery having the above configuration has a risk of leakage of the electrolyte. Moreover, the organic solvent etc. which are used for electrolyte solution are combustible substances. For this reason, it is required to further increase the safety of the battery.

Therefore, as one countermeasure for improving the safety of the battery, it has been proposed to use a solid electrolyte as the electrolyte instead of the electrolytic solution. Furthermore, development of an all-solid battery in which a solid electrolyte is used as an electrolyte and the other constituent elements are also made of solid is being promoted.

For example, Japanese Patent Laid-Open No. 2001-15153 (hereinafter referred to as Patent Document 1) discloses an all-solid state in which a plurality of battery elements formed by sequentially laminating a positive electrode made of an inorganic compound, a solid electrolyte, and a negative electrode are provided on a current collector. In the secondary battery manufacturing method, after the battery element is formed on the current collector, the battery element is dicing, laser ablation, chemical etching, plasma etching, ion etching, electron beam, or a combination thereof. Is disclosed. Specifically, an example in which a battery element is disposed on an aluminum current collector and the battery element is cut using a YAG laser is disclosed.

Japanese Patent Laid-Open No. 2001-15153

As a result of various investigations by the inventors on the production method of an all-solid-state battery as described in Patent Document 1, depending on the type (wavelength) of the laser used, absorption of the laser into the laminate constituting the battery element It has been found that the laminate may not be cut due to the occurrence of large burrs on the cut surface because the rate is insufficient. The present invention has been made based on the above findings.

Therefore, an object of the present invention is to provide a manufacturing method of an all-solid battery capable of suppressing the generation of burrs on a cut surface and cutting a laminate, and an all-solid battery manufactured by the method.

As a result of various studies conducted by the inventors to solve the above problems, the generation of burrs on the cut surface is suppressed and the laminate is cut by limiting the wavelength of the laser to be used within a specific range. I found that I can do it. Based on such knowledge of the inventors, the present invention has the following features.

The manufacturing method of the all-solid-state battery according to the present invention includes the following steps.

(A) A laminate in which a green electrode layer that is a green body of at least one of a positive electrode layer and a negative electrode layer and a green solid electrolyte layer that is a green body of a solid electrolyte layer are stacked. Laminate formation process for forming

(B) A cutting step of cutting the laminate by irradiating a laser having a wavelength of 266 nm or more and 810 nm or less.

The method for producing an all solid state battery of the present invention may further include a firing step of firing the laminate after the cutting step, and may further include a firing step of firing the laminate before the cutting step.

In the all-solid-state battery manufacturing method of the present invention, the laser is preferably one type of laser selected from the group consisting of FHG laser, THG laser, SHG laser, and semiconductor laser.

In the laminated body formation step, the green body may be formed by laminating the green body of the positive electrode layer, the solid electrolyte layer, and the negative electrode layer, or the green body of the current collector layer. A laminate may be formed by laminating a plurality of laminates having the above single cell structure with the intervening layer.

In the method for producing an all solid state battery of the present invention, it is preferable that at least one material of the positive electrode layer, the solid electrolyte layer, or the negative electrode layer includes a solid electrolyte made of a lithium-containing phosphate compound having a NASICON structure.

In the method for producing an all solid state battery of the present invention, it is preferable that at least one material of the positive electrode layer or the negative electrode layer includes an electrode active material made of a lithium-containing phosphate compound.

In addition, in the manufacturing method of the all-solid-state battery of this invention, a non-sintered electrode layer and a non-sintered solid electrolyte layer should just have the form of a green sheet or a printing layer.

The all solid state battery according to the present invention is manufactured by a manufacturing method having the above-described features.

An all solid state battery according to the present invention is an all solid state battery comprising a laminate including a positive electrode layer, a solid electrolyte layer, and a negative electrode layer, wherein at least a part of the end surface of the laminate is melted by the solid electrolyte layer. The insulating film formed in this way is covered.

In the method for producing an all solid state battery of the present invention, by limiting the wavelength of the laser to be used within a specific range, generation of burrs on the cut surface can be suppressed, and the laminate can be efficiently cut.

It is sectional drawing which shows typically the cross-section of the all-solid-state battery as one embodiment with which the manufacturing method of this invention is applied. It is sectional drawing which shows typically the cross-section of the all-solid-state battery as another embodiment with which the manufacturing method of this invention is applied. It is a perspective view which shows the irradiation direction of the laser used in order to cut | disconnect a laminated body in the Example of the manufacturing method of this invention, and the observation direction of a cut part. It is the photograph of the cut part observed in the Example and comparative example of this invention. It is the photograph which observed the cut surface of the laminated body before baking after baking in the Example of this invention with the scanning electron microscope.

As shown in FIG. 1, a laminate 10 of an all-solid battery as one embodiment to which the manufacturing method of the present invention is applied is a single battery composed of a positive electrode layer 1, a solid electrolyte layer 2, and a negative electrode layer 3. Composed. The positive electrode layer 1 is disposed on one surface of the solid electrolyte layer 2, and the negative electrode layer 3 is disposed on the other surface opposite to the one surface of the solid electrolyte layer 2. In other words, the positive electrode layer 1 and the negative electrode layer 3 are provided at positions facing each other via the solid electrolyte layer 2, and a pair of the positive electrode layer 1 and the negative electrode layer 3 are laminated via the solid electrolyte layer 2. A current collector layer 4 is disposed on the other surface opposite to the one surface of the positive electrode layer 1 facing the solid electrolyte layer 2. A current collector layer 4 is disposed on one surface of the negative electrode layer 3 facing the solid electrolyte layer 2 and the other surface on the opposite side.

As shown in FIG. 2, an all-solid battery laminate 20 as another embodiment to which the manufacturing method of the present invention is applied includes a positive electrode layer 1, a solid electrolyte layer 2, and a negative electrode layer 3. A plurality of, for example, two unit cells are connected in series via the current collector layer 4. The current collector layer 4 disposed inside the laminate 20 of the all solid state battery is provided between the positive electrode layer 1 and the negative electrode layer 3. A current collector layer 4 is disposed on the other surface opposite to the one surface of the positive electrode layer 1 facing the solid electrolyte layer 2. A current collector layer 4 is disposed on one surface of the negative electrode layer 3 facing the solid electrolyte layer 2 and the other surface on the opposite side.

Note that each of the positive electrode layer 1 and the negative electrode layer 3 includes a solid electrolyte and an electrode active material, and the solid electrolyte layer 2 includes a solid electrolyte. Each of the positive electrode layer 1 and the negative electrode layer 3 may include a carbon material, a metal material, or the like as an electron conductive material.

In order to manufacture the laminated

bodies

10 and 20 of the all-solid-state battery configured as described above, in the present invention, first, an unsintered body that is an unsintered body of at least one of the positive electrode layer 1 and the negative electrode layer 3 An electrode layer, a green solid electrolyte layer that is a green body of the solid electrolyte layer 2, and a green current collector layer that is a green body of the current collector layer 4 are prepared. Thereafter, the produced unsintered electrode layer, unsintered solid electrolyte layer, and unsintered current collector layer are laminated to form laminates 10 and 20 (laminate formation step). Next, the laminated

bodies

10 and 20 are cut into a predetermined size by irradiating a laser having a wavelength of 266 nm or more and 810 nm or less (cutting step). And the laminated

bodies

10 and 20 are baked (baking process).

By limiting the wavelength of the laser used in this way to a specific range, the generation of burrs on the cut surface can be suppressed, and the

laminates

10 and 20 can be cut efficiently.

In addition, although the baking process which bakes the laminated

bodies

10 and 20 is performed after the cutting process as mentioned above, you may perform the baking process which bakes the laminated

bodies

10 and 20 before a cutting process.

As the laser having a wavelength of 266 nm or more and 810 nm or less, an FHG laser, a THG laser, an SHG laser, or a semiconductor laser can be used. Further, the laser irradiation output can be appropriately changed according to the type of laser used or the laser oscillator. Generally, the shorter the laser wavelength is used, the lower the laser irradiation output tends to be. However, when the

laminates

10 and 20 are cut using a laser having a wavelength of 266 nm or more and 810 nm or less, Preferably, the

stacked bodies

10 and 20 can be cut more efficiently by setting the laser irradiation output to 5 W or more and 50 W or less.

In the laminated body forming step, the green body 10 shown in FIG. 1 may be formed by laminating the green body of the positive electrode layer 1, the solid electrolyte layer 2, and the negative electrode layer 3. In the process, the laminate 20 may be formed by laminating a plurality of the laminates 10 having the single cell structure with a green body of the current collector layer 4 interposed therebetween. In this case, a plurality of laminates 10 having a single cell structure may be laminated in series electrically or in parallel.

The unsintered electrode layer, unsintered solid electrolyte layer, and unsintered current collector layer only have to be in the form of a green sheet or a printed layer.

In the firing step, the laminate is preferably fired under pressure. By firing the

laminates

10 and 20 in a state where pressure is applied, the positive electrode layer 1 or the negative electrode layer 3 and the solid electrolyte layer 2 are easily joined by sintering without any gap.

The method of forming the green electrode layer, the green solid electrolyte layer, and the green current collector layer is not particularly limited, but a doctor blade method, a die coater, a comma coater, etc. are used to form a green sheet. Screen printing or the like can be used to form a print layer. The method for laminating the green electrode layer, green solid electrolyte layer and green current collector layer is not particularly limited, but hot isostatic pressing, cold isostatic pressing, isostatic pressing, etc. It can be used to laminate a green layer.

A slurry for forming a green sheet or printed layer is prepared by wet-mixing an organic vehicle in which a polymer material is dissolved in a solvent and a positive electrode active material, a negative electrode active material, a solid electrolyte, or a current collector material. can do. Media can be used in wet mixing, and specifically, a ball mill method, a viscomill method, or the like can be used. On the other hand, a wet mixing method that does not use media may be used, and a sand mill method, a high-pressure homogenizer method, a kneader dispersion method, or the like can be used.

The slurry may contain a plasticizer. Although the kind of plasticizer is not particularly limited, phthalic acid esters such as dioctyl phthalate and diisononyl phthalate may be used.

In the firing step, the atmosphere is not particularly limited, but it is preferably performed under conditions that do not change the valence of the transition metal contained in the electrode active material.

In addition, although the kind of electrode active material contained in the positive electrode layer 1 or the negative electrode layer 3 of the

laminated bodies

10 and 20 of the all-solid-state battery to which the manufacturing method of the present invention is applied is not limited, as the positive electrode active material, Li ₃ V ₂ (PO ₄ ) _{3 and} other lithium-containing phosphate compounds having NASICON type structure, LiFePO ₄ and LiMnPO _{4 and} other lithium-containing phosphate compounds, LiCoO ₂ , LiCo _1/3 Ni _1/3 Mn ₁ A layered compound such as _{/ 3} O ₂ and a lithium-containing compound having a spinel structure such as LiMn ₂ O ₄ and LiNi _0.5 Mn _1.5 O ₄ can be used.

As the negative electrode active material, MOx (M is at least one element selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb and Mo, and x is 0.9 ≦ x ≦ 2.0. A compound having a composition represented by the following formula can be used. For example, a mixture obtained by mixing two or more active materials having a composition represented by MOx containing different elements M such as TiO ₂ and SiO ₂ may be used. As the negative electrode active material, graphite-lithium compounds, lithium alloys such as Li-Al, oxidation of Li ₃ V ₂ (PO ₄ ) ₃ , Li ₃ Fe ₂ (PO ₄ ) ₃ , Li ₄ Ti ₅ O _12, etc. A thing etc. can be used.

Moreover, although the kind of solid electrolyte contained in the positive electrode layer 1, the negative electrode layer 3, or the solid electrolyte layer 2 of the

laminates

10 and 20 of the all-solid battery to which the manufacturing method of the present invention is applied is not limited, Can use a lithium-containing phosphate compound having a NASICON structure. Lithium-containing phosphoric acid compound having a NASICON-type structure, the chemical formula _{_{_{Li x M y (PO 4)}}} 3 ( Formula, x 1 ≦ x ≦ 2, y is a number in the range of 1 ≦ y ≦ 2, M Is one or more elements selected from the group consisting of Ti, Ge, Al, Ga and Zr). In this case, part of P in the above chemical formula may be substituted with B, Si, or the like. For example, a mixture obtained by mixing two or more Nasicon-type lithium-containing phosphate compounds having different compositions such as Li _1.5 Al _0.5 Ge _1.5 (PO ₄ ) ₃ and Li _1.2 Al _0.2 Ti _1.8 (PO ₄ ) ₃ is used. It may be used.

The lithium-containing phosphate compound having a NASICON structure used in the solid electrolyte is a compound containing a crystal phase of a lithium-containing phosphate compound having a NASICON structure or a lithium-containing phosphate having a NASICON structure by heat treatment. You may use the glass which precipitates the crystal phase of a phosphoric acid compound.

In addition, as a material used for said solid electrolyte, it is possible to use the material which has ion conductivity and is so small that electronic conductivity can be disregarded other than the lithium-containing phosphate compound which has a NASICON structure. Examples of such a material include lithium halide, lithium nitride, lithium oxyacid salt, and derivatives thereof. In addition, Li—PO compounds such as lithium phosphate (Li ₃ PO ₄ ), LIPON (LiPO _4−x N _x ) in which nitrogen is introduced into lithium phosphate, Li—Si— such as Li ₄ SiO ₄ O-based compounds, Li-P-Si-O based compounds, Li-V-Si-O based compounds, La _0.51 Li _0.35 TiO _2.94 , La _0.55 Li _0.35 TiO ₃ , Li _3x La _{2 / 3-x} TiO _3, etc. Examples thereof include compounds having a perovskite structure, compounds having a garnet structure having Li, La, and Zr.

At least one material of the positive electrode layer 1, the solid electrolyte layer 2, or the negative electrode layer 3 of the

laminates

10 and 20 of the all-solid-state battery to which the manufacturing method of the present invention is applied is composed of a lithium-containing phosphate compound having a NASICON structure. It is preferable to contain the solid electrolyte which becomes. In this case, high ion conductivity that is essential for battery operation of an all-solid battery can be obtained. In addition, when glass or glass ceramics having a composition of a lithium-containing phosphate compound having a NASICON type structure is used as a solid electrolyte, a denser sintered body can be easily obtained due to the viscous flow of the glass phase in the firing step. Therefore, it is particularly preferable to prepare the starting material for the solid electrolyte in the form of glass or glass ceramics.

Moreover, it is preferable that at least one material of the positive electrode layer 1 or the negative electrode layer 3 of the

laminates

10 and 20 of the all-solid-state battery to which the manufacturing method of the present invention is applied includes an electrode active material made of a lithium-containing phosphate compound. . In this case, the phase change of the electrode active material in the firing step or the reaction of the electrode active material with the solid electrolyte can be easily suppressed by the high temperature stability of the phosphoric acid skeleton. The capacity can be increased. In addition, when an electrode active material composed of a lithium-containing phosphate compound and a solid electrolyte composed of a lithium-containing phosphate compound having a NASICON structure are used in combination, the reaction between the electrode active material and the solid electrolyte is suppressed in the firing step. It is particularly preferable to use a combination of the electrode active material and the solid electrolyte material as described above, since both of them can be obtained and good contact can be obtained.

Furthermore, the current collector layer 4 of the laminate 20 of the all-solid-state battery to which the manufacturing method of the present invention is applied contains an electron conductive material. The electron conductive material preferably contains at least one selected from the group consisting of conductive oxides, metals, and carbon materials.

Next, specific examples of the present invention will be described. In addition, the Example shown below is an example and this invention is not limited to the following Example.

Hereinafter, an all-solid battery manufactured according to the manufacturing method of the present invention will be described.

First, in order to produce an all-solid battery, the following materials were prepared as starting materials for the solid electrolyte layer, the positive electrode layer, the negative electrode layer, and the current collector layer.

A glass powder having a composition of Li _1.5 Al _0.5 Ge _1.5 (PO ₄ ) ₃ as a solid electrolyte material, and a powder having a crystal phase of NASICON type structure having a composition of Li ₃ V ₂ (PO ₄ ) ₃ as a positive electrode active material, Titanium dioxide (TiO ₂ ) powder having an anatase type crystal structure as a negative electrode active material, carbon powder as an electron conductive material, and glass ceramic powder having a composition of Li _1.0 Ge _2.0 (PO ₄ ) ₃ as a sinterable material Got ready.

Each slurry was prepared by the following method using the above materials.

(Preparation of slurry)

The following main materials, polybutyral resin and alcohol were weighed at a mass ratio of 100: 15: 140. And after melt | dissolving polybutyral resin in alcohol, after enclosing and stirring with a main material and a medium in a container, each slurry was produced by taking out a medium from a container.

Main materials are solid electrolyte material for solid electrolyte slurry, positive electrode active material for positive electrode slurry, powder mixed with electron conductive material and solid electrolyte material in mass ratio of 40:10:50, and negative electrode active material for negative electrode slurry. A powder in which an electron conductive material and a solid electrolyte material are mixed at a mass ratio of 40:10:50, and a powder in which a current collector slurry is a mixture of an electron conductive material and a sinterable material in a mass ratio of 10:90 is used. did.

Each green sheet was produced by the following method using each obtained slurry.

(Green sheet production process)

Each slurry was coated on a polyethylene terephthalate (PET) film using a doctor blade method, dried on a hot plate heated to a temperature of 40 ° C., formed into a sheet having a thickness of 10 μm, and 25 mm × 25 mm Each green sheet was prepared by cutting into a size of.

Using each obtained green sheet, a laminate was formed by the following method.

(Laminate formation process)

Each time the green sheets peeled from the PET film were stacked one by one, the laminate 20 was formed by thermocompression in order. Thermocompression bonding was performed by heating each green sheet to a temperature of 60 ° C. and applying pressure.

Next, in order to sufficiently improve the adhesion between the green sheets constituting the laminate 20, the laminate 20 is sealed in a polyethylene bag in a vacuum state, and the polyethylene bag is placed in water at a temperature of 80 ° C. Immersion and pressure was applied to the water. A pressure of 180 MPa was applied to the water by an isotropic pressure press.

In addition, as shown in FIG. 2, the laminated body 20 has a structure in which two unit cells are laminated so as to be electrically connected in series, and the two unit cells are formed from two current collector green sheets. The current collector layers 4 are connected in series. Further, the two current collector layers 4 are arranged so as to sandwich the outside of the two unit cells. Each unit cell includes a positive electrode layer 1 composed of two positive electrode green sheets, a solid electrolyte layer 2 composed of five solid electrolyte green sheets, and a negative electrode layer 3 composed of one negative electrode sheet.

Specifically, as shown in FIG. 2, two current collector green sheets constituting the current collector layer 4, one negative green sheet constituting the negative electrode layer 3, and the solid electrolyte layer 2 are constituted from the bottom. 5 solid electrolyte green sheets, 2 positive green sheets constituting

positive electrode layer

1, 2 current collector green sheets constituting

current collector layer

4, 1 negative green sheet constituting negative electrode layer 3, solid electrolyte layer The green sheets are stacked in the order of five solid electrolyte green sheets constituting 2, two positive electrode green sheets constituting the positive electrode layer 1, and two current collector green sheets constituting the current collector layer 4 to form a laminate 20. did.

(Cutting the laminate with a laser and firing the laminate thereafter)

The unsintered laminate 20 was placed on the XY stage with the negative electrode layer 3 side up, and irradiated with lasers of various wavelengths as shown in Examples 1 to 5 and Comparative Examples in Table 1 below. The laminate 20 was cut into a size of 10 mm × 10 mm by moving the XY stage by about 10 mm. Then, the cut part of the laminated body 20 was observed with the optical microscope, and it was confirmed whether it was cut | disconnected. The irradiation direction of the laser and the observation direction of the cut portion are as shown in FIG.

Laser irradiation was performed using a laser oscillator shown in Table 1 or a laser irradiation apparatus. The pulse period of laser irradiation was appropriately adjusted in the range of 10 to 100 kHz. The cutting speed (XY stage moving speed) was appropriately adjusted in the range of 50 to 1000 mm / s.

Table 1 shows the cutting results. FIG. 4 shows a photograph of the cut portion observed. The layer that appears white in FIG. 4 corresponds to the solid electrolyte layer 2 (FIG. 2).

As can be seen from Table 1 and FIG. 4, in Examples 1 to 5, the laminate 20 could be cut by laser irradiation, but in the comparative example, it could not be cut. In particular, in the comparative example using the YAG laser (wavelength 1064 nm), the positive electrode layer 1 positioned above and below the solid electrolyte layer 2 without cutting the solid electrolyte layer 2 (the white layer in FIG. 4) constituting the laminate 20. It was confirmed that the negative electrode layer 3 and the current collector layer 4 were selectively cut. Therefore, in order to cut the unsintered laminate 20 containing a solid electrolyte made of a glassy phosphate compound, it is effective to irradiate a semiconductor laser (wavelength 810 nm) and a laser having a shorter wavelength than the semiconductor laser. It was confirmed that.

Next, the unsintered laminate 20 cut by laser irradiation in Examples 1 to 5 was baked at a temperature of 400 ° C. in a nitrogen gas atmosphere to decompose and remove the polybutyral resin. Thereafter, the laminate 20 is baked at a temperature of 550 ° C. in an oxygen gas atmosphere to remove resin carbide, and further baked at a temperature of 700 ° C. in a nitrogen gas atmosphere. The laminated body 20 was produced.

The all-solid battery stack 20 of Examples 1 to 5 obtained in this way was sealed in a 2032 type coin cell and charged and discharged with a current of 10 μA. And confirmed to operate as a two-series battery having a discharge plateau.

(Lamination of laminate and subsequent cutting of laminate with laser)

The unsintered laminate 20 was fired in a nitrogen gas atmosphere at a temperature of 400 ° C. to decompose and remove the polybutyral resin. Thereafter, the laminate 20 as a sintered body is fired at a temperature of 550 ° C. in an oxygen gas atmosphere to remove the carbide of the resin, and further fired at a temperature of 700 ° C. in a nitrogen gas atmosphere. Produced.

Next, the unsintered laminate 20 was placed on the XY stage with the negative electrode layer 3 side up, and lasers of various wavelengths were irradiated as shown in Examples 1 to 5 and Comparative Example in Table 1. While moving the XY stage about 10 mm, the laminate 20 was cut into a size of 10 mm × 10 mm.

As a result, the sintered body could be cut by irradiating a semiconductor laser (wavelength 810 nm) and a laser having a shorter wavelength than the semiconductor laser, but could not be cut by a YAG laser (wavelength 1064 nm). It was. Therefore, in order to cut the sintered laminate 20 containing a solid electrolyte made of a phosphoric acid compound, it is effective to irradiate a semiconductor laser (wavelength 810 nm) and a laser having a shorter wavelength than the semiconductor laser. Was confirmed.

The all-solid-state battery laminate 20 obtained by cutting after sintering was sealed in a 2032 type coin cell and charged and discharged at a current of 10 μA. In each case, a discharge plateau was applied at a voltage of 2 to 4 V. It confirmed that it operate | moves as a 2 series battery which has.

In the above embodiment, a method of disposing the unsintered or sintered laminate 20 on the XY stage and moving the XY stage to cut the laminate 20 is adopted. The laminate 20 may be cut by fixing 20 and arbitrarily scanning a laser using a galvano scanner.

The photograph which observed the cut surface of the laminated body 20 before and after baking in Example 2 with the scanning electron microscope is shown by (A) and (B) of FIG. As shown in FIG. 5, when the laminated body 20 is cut using a laser having a wavelength of 266 nm or more and 810 nm or less, at least a part of the end surface is covered with an insulating film formed by melting the solid electrolyte layer. Yes. Since the insulating film has electronic insulating properties, a short circuit at the end face can be suppressed. Note that the insulating film formed by melting the solid electrolyte layer may exhibit ionic conduction.

It should be considered that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above embodiments and examples but by the claims, and is intended to include all modifications and variations within the meaning and scope equivalent to the claims.

In the manufacturing method of the all-solid-state battery of the present invention, by limiting the wavelength of the laser to be used within a specific range, it is possible to suppress the generation of burrs on the cut surface and efficiently cut the laminate. The present invention is particularly useful for the production of all-solid secondary batteries.

1: positive electrode layer, 2: solid electrolyte layer, 3: negative electrode layer, 4: current collector layer, 10, 20: laminate.

Claims

A non-sintered electrode layer, which is at least one of a positive electrode layer and a negative electrode layer, and a non-sintered solid electrolyte layer, which is a non-sintered solid electrolyte layer, are stacked to form a laminate. A laminate forming step;
And a cutting step of cutting the laminated body by irradiating a laser having a wavelength of 266 nm or more and 810 nm or less.
The manufacturing method of the all-solid-state battery of Claim 1 further equipped with the baking process which bakes the said laminated body after the said cutting process.
The manufacturing method of the all-solid-state battery of Claim 1 further equipped with the baking process which bakes the said laminated body before the said cutting process.
4. The all solid according to claim 1, wherein the laser is one type of laser selected from the group consisting of an FHG laser, a THG laser, an SHG laser, and a semiconductor laser. Battery manufacturing method.
The said laminated body formation process includes laminating | stacking the non-sintered body of the said positive electrode layer, the said solid electrolyte layer, and the said negative electrode layer, and forms the laminated body of a single cell structure. The manufacturing method of the all-solid-state battery of any one of until.
The said laminated body formation process includes forming the laminated body by laminating | stacking several laminated bodies of the said single battery structure through the non-sintered body of a collector layer. Manufacturing method of all solid state battery.
7. The device according to claim 1, wherein at least one material of the positive electrode layer, the solid electrolyte layer, or the negative electrode layer includes a solid electrolyte made of a lithium-containing phosphate compound having a NASICON structure. The manufacturing method of the all-solid-state battery as described in 1 above.
The method for producing an all-solid-state battery according to any one of claims 1 to 7, wherein at least one material of the positive electrode layer or the negative electrode layer includes an electrode active material made of a lithium-containing phosphate compound.
The method for producing an all solid state battery according to any one of claims 1 to 8, wherein the unsintered electrode layer and the unsintered solid electrolyte layer have a form of a green sheet or a printed layer.
An all-solid-state battery manufactured by the manufacturing method according to any one of claims 1 to 9.
An all-solid battery comprising a laminate comprising a positive electrode layer, a solid electrolyte layer, and a negative electrode layer,
An all-solid battery, wherein at least a part of the end face of the laminate is covered with an insulating film formed by melting the solid electrolyte layer.