KR102134458B1 - All solid state battery and a polymer electrolyte for the same - Google Patents

Abstract

The present invention relates to a polymer electrolyte and an all-solid-state battery comprising the polymer electrolyte. The polymer electrolyte includes two or more unit polymer electrolyte layers (unit layers), and among the plurality of unit layers included in the polymer electrolyte, the negative electrode facing layer facing the negative electrode is relatively compared to the positive electrode facing layer facing the positive electrode. High ionic conductivity. In addition, the cathode facing layer has a lower mechanical strength than the anode facing layer.

Description

All solid state battery and a polymer electrolyte for the same}

The present invention relates to a polymer electrolyte and an all-solid-state battery comprising the polymer electrolyte.

Much research has been conducted to focus on alternative energy and alternative power sources, that is, electrochemical energy production methods, in order to respond to rapidly increasing energy consumption and to change into an environmentally friendly form of consumption. There are secondary batteries, fuel cells, and capacitors in the method of storing and converting electrochemical energy, and many studies have been conducted on lithium secondary batteries known to have the best discharge performance.

Secondary batteries are the three core strategic products that will lead the domestic electronic information device industry along with semiconductors and displays, and influence the performance of future mobile IT products closely related to the lives of humans in the 21st century, such as mobile phones, laptops, computers, camcorders, MP3s, and PDAs. Of course, it is adding importance as a power source for electric vehicles.

Among them, lithium polymer batteries are most frequently studied due to their high energy density and discharge voltage, and are currently commercialized in cell phones and camcorders.

At present, polyethylene oxide [poly(ethylene oxide), PEO]-based polymer electrolytes are known as one of the largest commercially available polymer electrolytes as electrolytes used in lithium polymer batteries. However, in the case of a polymer electrolyte using PEO, a relatively high ionic conductivity of 10 ^-4 S/cm is exhibited at a high temperature of 60°C or higher, but there is a problem that the ionic conductivity is lowered to 10 ^-8 s/cm at room temperature. This problem is due to the high crystallinity (up to 80%) at room temperature of PEO. The movement of ions in the electrolyte is caused by the segmental motion of the polymer, and such movement is limited in the crystal region. Therefore, research has been conducted to develop a polymer electrolyte having high ionic conductivity and mechanical strength at relatively low and normal temperatures by suppressing the crystallinity of the polymer electrolyte.

In order to secure ion conductivity at room temperature, the existing solid polymer electrolyte for lithium secondary batteries has introduced various additives for the purpose of controlling the crystallinity of the polymer matrix PEO. For example, Korean Patent Registration No. 10-2722834 discloses "a method for manufacturing a polymer electrolyte composite material and a lithium polymer battery provided with the solid polymer electrolyte composite material". In most cases, however, the crystallinity is controlled when the additive is introduced, but at the same time, a problem occurs in that mechanical properties are weakened. In addition, since the size of the additives themselves affects the mobility of the PEO chain, it suffers from the disadvantage of causing an increase in the glass transition temperature (T _g ), which is a very important factor in ion conduction at room temperature and low temperature. have. In addition, when an additive is introduced to improve the strength of the solid polymer electrolyte, the strength of the solid polymer electrolyte is improved, but at the same time, the elongation is lowered. Therefore, there is a need to develop an additive capable of simultaneously improving the strength and elongation of the solid polymer electrolyte.

In addition, an all-solid-state battery in which lithium metal is applied as a negative electrode easily causes an internal short circuit due to the growth of dendrites of lithium, and causes a decrease in battery life or a decrease in safety. In order to suppress the dendrite growth of lithium, research has been conducted to increase the strength of the solid polymer electrolyte. However, the polymer electrolyte tends to have low ionic conductivity when the strength is increased, so the interface resistance with lithium is not good, thereby increasing the battery resistance.

In addition to increasing the strength of the polymer electrolyte in terms of energy density and lifetime of the all-solid-state battery, other strategies are needed.

An object of the present invention is to provide a polymer electrolyte for an all-solid-state battery having high ion conductivity and mechanical strength. It will be readily appreciated that other objects and advantages of the present invention can be realized by means of the claims and combinations thereof.

The present invention relates to a polymer electrolyte and an all-solid-state battery comprising the polymer electrolyte. The first aspect of the present invention relates to the polymer electrolyte, wherein the polymer electrolyte includes two or more unit polymer electrolyte layers, and the polymer electrolyte includes a cathode facing layer and an anode facing layer on the outermost surface, respectively, and the cathode. The facing layer has a relatively high ion conductivity and a low mechanical strength compared to the anode facing layer.

In the second aspect of the present invention, in the first aspect, the cathode facing layer has an ion conductivity of 3×10 ^-4 S/cm to 1×10 ^-2 S/cm, and a shear modulus of 1 It is Pa to 1x10 ⁵ Pa.

The polymer electrolyte according to the present invention can suppress dendrite growth and improve battery performance by applying two or more polymer electrolyte layers having different characteristics.

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and the present invention serves to further understand the technical idea of the present invention together with the detailed description of the invention described below. It is not limited to interpretation. Meanwhile, the shape, size, scale, or ratio of elements in the drawings included in the present specification may be exaggerated to emphasize a clearer description.
1 is a cross-sectional view of an electrode assembly including a polymer electrolyte according to the present invention.
Figure 2 is a schematic view showing the shape of lithium dendride formed in a battery comprising a polymer electrolyte according to the present invention.
3 is a diagram showing the shape of lithium dendride formed in a battery including a polymer electrolyte according to a comparative example.
4 is a graph showing the comparison of cycle characteristics of the batteries prepared in Examples and Comparative Examples.

The terms used in the present specification and claims should not be interpreted as being limited to ordinary or lexical meanings, and the inventor can appropriately define the concept of terms in order to explain his or her invention in the best way. Based on the principles, it should be interpreted as meanings and concepts consistent with the technical spirit of the present invention. Therefore, the configuration shown in the embodiments described herein is only one of the most preferred embodiments of the present invention and does not represent all of the technical spirit of the present invention, and various equivalents that can replace them at the time of this application It should be understood that there may be water and variations.

Throughout the present specification, when a part is said to be'connected' to another part, this includes not only'directly connected' but also'electrically connected with other elements in between'. .

Throughout the present specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless otherwise stated.

The terms'about','substantially', and the like used throughout this specification are used in or as close to the numerical values when manufacturing and material tolerances unique to the stated meaning are used, and are used to help understand the present application. Or an absolute value is used to prevent unconscionable exploitation of the disclosed content by unscrupulous intruders.

Throughout this specification, when one member is positioned “on” another member, this includes not only the case where one member abuts another member, but also the case where another member exists between the two members.

Throughout the present specification, the term “combination(s)” included on the surface of a marki form means one or more mixtures or combinations selected from the group consisting of elements described in the marki form. It means to include one or more selected from the group consisting of the above components.

Throughout this specification, the description of “A and/or B” means “A or B or both”.

Hereinafter, embodiments of the present invention have been described in detail, but the present application may not be limited to the following specific embodiments.

The present invention relates to a polymer electrolyte for an all-solid-state battery. The polymer electrolyte includes two or more unit polymer electrolyte layers (unit layers), and among the plurality of unit layers included in the polymer electrolyte, the negative electrode facing layer facing the negative electrode is relatively compared to the positive electrode facing layer facing the positive electrode. High ionic conductivity. In addition, the cathode facing layer has a lower mechanical strength than the anode facing layer.

In the present invention, the all-solid-state battery is a lithium ion secondary battery using a solid electrolyte as an electrolyte.

The negative electrode facing layer and the positive electrode facing layer refer to unit layers disposed on both outermost surface layers of the polymer electrolyte, respectively. In addition, throughout the present specification, the unit polymer electrolyte layer may be abbreviated as a unit layer.

In one specific embodiment of the present invention, the cathode facing layer has an ion conductivity of 3×10 ^-4 S/cm or more and 1×10 ^-2 S/cm or less. In addition, the shear modulus of the cathode facing layer is 1 Pa to 10 ⁵ Pa. On the other hand, the positive electrode facing layer has an ion conductivity lower than that of the negative electrode facing layer in the range of 1×10 ^-5 S/cm to 1×10 ^-3 S/cm. Alternatively, the ionic conductivity of the anode facing layer is 1×10 ^-5 S/cm or more and less than 3×10 ^-4 S/cm or 1×10 ^-5 S/cm or more and less than 1×10 ^-4 S/cm. In addition, the shear modulus of the positive electrode facing layer is more than 10 ⁵ Pa and 10 ¹⁰ Pa or less.

In one specific embodiment of the present invention, the polymer electrolyte may be composed of a double layer of an anode facing layer and an anode facing layer. If one or more unit layers are additionally included between the cathode facing layer and the anode facing layer, the ionic conductivity decreases linearly or stepwise from the cathode facing layer toward the anode facing layer, and the mechanical strength is conversely linear or stepped. It is desirable to have a rising pattern.

Typically, the dendrites formed on the surface of the cathode can grow linearly and penetrate the polymer electrolyte. At this time, when the dendrites contact the anode, an electrical short circuit may occur (see FIG. 3). However, in the case of a polymer electrolyte comprising a double layer of the negative electrode facing layer and the positive electrode facing layer having the above-described characteristics, even if the negative electrode facing layer is penetrated by the growth of dendrites formed on the lithium surface, the mechanical strength of the positive electrode facing layer is high and dendrites The vertical growth of is controlled. In addition, since the positive electrode facing layer has a lower ionic conductivity than the negative electrode facing layer, the kinetics of the electrolyte is faster in the vicinity of the lithium negative electrode surface than the positive electrode facing portion. Therefore, since lithium plating is directed toward the lithium metal surface, dendrites are formed horizontally along the lithium metal surface rather than vertically growing (see FIG. 2).

In one specific embodiment of the present invention, the negative electrode facing layer includes a polymer resin and a lithium salt.

The polymer resin (A) included in the cathode facing layer preferably has a minimum ion conductivity of 5×10 ^-4 S/cm. In addition, its glass transition temperature (Tg) is a maximum of 80 ℃. The minimum value of the glass transition temperature may be -30 ℃, -20 ℃, -10 ℃, 0 ℃, 10 ℃ or 20 ℃.

The polymer resin (A) included in the negative electrode facing layer includes linear poly(ethylene oxide) (PEO); Comb-like PEO having a crosslinking moiety of 0 to 10%; A comb-shaped, star-shaped or branched polysiloxane having a crosslinking moiety of 0 to 20%, and polysilsesquioxane; Polyphosphazene; And polypropylene oxide; or a mixture comprising at least one selected from the group consisting of copolymers.

In the entire specification of the present invention, the crosslinking moiety is a ratio of a crosslinkable moiety in a side chain bonded to a polymer main chain, and a unit is a molar ratio (mol%).

In addition, in one specific embodiment of the present invention, the positive electrode facing layer includes a polymer resin (C) and a lithium salt.

The polymer resin (C) included in the positive electrode facing layer preferably has a minimum ion conductivity of 5×10 ^-5 S/cm at a battery operating temperature. In addition, its glass transition temperature (Tg) is more than 80 ℃ 120 ℃, 150 ℃, 200 ℃, or 250 ℃ or less.

The polymer resin (C) included in the positive electrode facing layer includes polyacrylonitrile (PAN); Poly(methyl methacrylate) (PMMA); Polyvinylpyrrolidone (PVP); Polyacrylic acid (PAA); Polyvinyl chloride (PVC); Polystyrene (PS); Comb-like PEO having a crosslinking moiety of 20% or more; Comb, star or branched polysiloxanes and polysilsesquioxanes having a crosslinking moiety greater than 20%; Polyphosphazene having a crosslinking degree of 20% or more; And a polypropylene oxide having a crosslinking degree of 20% or more; It comprises one or two or more mixtures selected from the group consisting of, or copolymers comprising at least one of them.

In addition, in one specific embodiment of the present invention, the polymer resin (C) may be in the form of polymer alloys of the following C1 and C2:

C1) is a linear poly(ethylene oxide) (PEO); Comb-like PEO having a crosslinking moiety of 0 to 10%; A comb-shaped, star-shaped or branched polysiloxane having a crosslinking moiety of 0 to 20%, and polysilsesquioxane; Polyphosphazene; And polypropylene oxide; is one or more mixtures selected from the group consisting of or a copolymer comprising at least one of them,

C2 is a crosslinkable oligomer.

In the present invention, the crosslinkable oligomer C2 may be exemplified by substituted acrylates, unsubstituted acrylates, methacrylates, epoxy groups, silanes, etc., and in addition, any oligomer capable of crosslinking itself may be applied without particular limitation. .

In the present invention, the polymer alloys have two or more polymer resins of different types having an interpanentrating network (IPN) or a semi-interpanentrating network (Semi-IPN) by dense cross-linking of each other. . Here, the crosslinking includes both chemical covalent bonding and/or simple physical crosslinking of the two polymer resins.

In addition, in one specific embodiment of the present invention, the polymer resin (C) may be the following C3 and C4 block copolymers:

C3) is a linear poly(ethylene oxide) (PEO); Comb-like PEO having a crosslinking moiety of 0 to 10%; A comb-shaped, star-shaped or branched polysiloxane having a crosslinking moiety of 0 to 20%, and polysilsesquioxane; Polyphosphazene; And polypropylene oxide; is one or more mixtures selected from the group consisting of or a copolymer comprising at least one of them,

C4) is not particularly limited to any kind, and a polymer commercialized in the field to which the present invention pertains can be applied without limitation. For example, polystyrene (PS); Polyacrylic acid (PAA); Poly(methyl methacrylate) (PMMA); Polyethylene (PE) may be one or more selected from, but is not particularly limited to these.

Meanwhile, in a specific embodiment of the present invention, the lithium salt contained in the polymer electrolyte is LiFSI, LiCl, LiBr, LiI, LiPF ₆ , LiBF ₄ , LiSbF ₆ , LiAsF ₆ , LiClO ₄ , LiCF ₃ SO ₃ , LiC ₄ F ₉ SO ₃ And LiN (SO ₂ CF ₃ ) ₂ It may include at least one selected from the group consisting of.

In addition, the present invention relates to an all-solid-state battery comprising the polymer electrolyte. The all-solid-state battery includes a negative electrode, a positive electrode, and a polymer electrolyte interposed between the negative electrode and the positive electrode. In the all-solid-state battery, the positive electrode facing layer of the polymer electrolyte faces the positive electrode and the negative electrode facing layer is disposed to face the negative electrode.

The positive electrode includes a current collector and a positive electrode active material layer formed on at least one surface of the current collector. The positive electrode active material layer is a positive electrode active material in the group consisting of lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium manganese-nickel-cobalt composite oxide, lithium metal oxide, lithium iron phosphate, sulfur, oxygen, lithium nickel manganese composite oxide It may include at least one selected. It represents such a positive electrode active material in more detail, as the positive electrode active material formula LiM _y O ₂ (where, M is M _{'1 -} a _k A _k, M' is _{Ni 1 -ab (Ni 1/2 Mn 1/2} ) a Co _b , 0.65≤a+b≤0.85 and 0.1≤b≤0.4, 0≤k≤0.05, and x+y=2, which is 0.95≤y≤1.05) (LNMO); Layered compounds such as lithium cobalt oxide (LiCoO ₂ ) and lithium nickel oxide (LiNiO ₂ ) or compounds substituted with one or more transition metals; Lithium manganese oxides such as the formula Li _{1 + x} Mn _{2 - x} O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO ₂ ; Lithium manganese composite oxide represented by Li ₂ Mn ₃ MO ₈ (where M = Fe, Co, Ni, Cu or Zn); LiMn ₂ O _{4 in} which part of Li in the formula is substituted with alkaline earth metal ions; Disulfide compounds; Fe ₂ (MoO ₄ ) _{3 ,} Or the formula Li _{1 - a} Fe _{1 - x} M _x (PO _4-b )X _b (Where a is -0.5 to 0.5, x is 0 to 0.5, and b is 0 to 0.1) and may further include one or more selected from lithium iron phosphate compounds (LiFePO ₄ ).

The positive electrode current collector is manufactured to a thickness of 3 to 500 μm. The negative electrode current collector may be any one that does not cause a chemical change in the battery and has conductivity. For example, copper, steel, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel surface treated with carbon, nickel, titanium, silver, or the like, aluminum-cadmium alloy, or the like can be used. The negative electrode current collector, like the positive electrode current collector, can form fine irregularities on the surface to increase the adhesion of the negative electrode active material, and various forms such as a film, sheet, foil, net, porous body, foam, and nonwoven fabric are possible.

In one specific embodiment of the present invention, the positive electrode active material layer may further include a conductive material and a binder.

The conductive material may include natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, carbon-based materials such as VGCF; Metal powders such as copper, nickel, aluminum, silver, or metal fibers; Conductive polymers such as polyphenylene derivatives; Or mixtures thereof.

The binder adheres the positive electrode active material particles to each other well, and also serves to adhere the negative electrode active material to the current collector. The binder specifically includes polyimide, polyamideimide, polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide Polymers, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, acrylate-styrene-butadiene rubber, epoxy resin, nylon, etc. However, it is not limited thereto.

The negative electrode includes a current collector and a negative electrode active material layer formed on at least one surface of the current collector, and the negative electrode active material layer includes a negative electrode active material, a conductive material, and a binder.

Lithium metal such as a lithium thin film may be used as the negative electrode active material. Alternatively, a lithium metal powder can be used. When using lithium metal powder, carbon, such as non-graphitized carbon and graphite-based carbon, is additionally used; Li _x Fe ₂ O ₃ (0≤x≤1), Li _x WO ₂ (0≤x≤1), Sn _x Me _{1 -x} Me' _y O _z (Me: Mn, Fe, Pb, Ge; Me' : Al, B, P, Si, group 1, group 2, group 3 elements of the periodic table, halogen; metal composite oxides such as 0<x≤1;1≤y≤3;1≤z≤8); Lithium metal; Lithium alloys; Silicon-based alloys; Tin-based alloys; SnO, SnO ₂ , PbO, PbO ₂ , Pb ₂ O ₃ , Pb ₃ O ₄ , Sb ₂ O ₃ , Sb ₂ O ₄ , Sb ₂ O ₅ , GeO, GeO ₂ , Bi ₂ O ₃ , Bi ₂ O ₄ , and Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni based materials; Titanium oxide; It may further include one or more selected from lithium titanium oxide.

The current collector, the conductive agent, and the binder may be the same as those described above for the positive electrode, but are not limited thereto.

In addition, the present invention provides a battery module including the all-solid-state battery as a unit cell, a battery pack including the battery module, and a device including the battery pack as a power source.

At this time, as a specific example of the device, a power tool (power tool) to move under power by an omnidirectional motor; Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs); Electric two-wheeled vehicles including electric bicycles (E-bikes) and electric scooters (E-scooters); Electric golf carts; And a power storage system, but is not limited thereto.

Hereinafter, the present invention is further described through examples, but the following examples are intended to illustrate the present invention, and the scope of the present invention is not limited thereto.

Example

Preparation of anode

Lithium iron phosphate (LiF ₃ PO ₄ , SUD-CHEMIE), VGCF, and binder (PEO (polyethylene oxide) and LiFSI mixture, EO/Li=9:1) are each DI in a weight ratio (wt%) of 76:20:4 A positive electrode mixture was prepared by adding and mixing in water, and the prepared positive electrode mixture was coated on a 20 μm thick aluminum foil as a positive electrode current collector to a thickness of 60 μm, followed by drying to prepare a positive electrode mixture.

Polymer electrolyte production

Cathode facing layer: A 1′ polymer solution was prepared by mixing polyethylene oxide (PEO) and LiFSI in acetonitrile so that EO/Li=20:1 in a molar ratio. The first polymer solution was cast on a suitable release paper and dried to prepare a cathode facing layer. At this time, the thickness of the cathode facing layer was 5 μm.

Anode facing layer: PEGDA (polyethylene glycol diacrylate, Mn = 575) is mixed with the first polymer solution to make 20 wt% of the total to prepare a second polymer solution, and then the second polymer solution is cast on an appropriate release paper and dried. An anode facing layer was prepared. At this time, the thickness of the positive electrode facing layer was 5 μm. The prepared positive electrode facing layer was cured by heat treatment at 100° C. for 12 hours. At this time, benzoyl peroxide was used as the thermal curing initiator, and was added at a ratio of 1 part by weight to 100 parts by weight of PEGDA.

The ionic conductivity and mechanical strength of the cathode facing layer and the anode facing layer are summarized in Table 1 below.

Battery Manufacturing

A lithium thin film having a thickness of 20 µm was used as the negative electrode.

Next, the positive electrode, the positive electrode facing layer, the negative electrode facing layer and the negative electrode were stacked in this order and cased to prepare an all-solid battery.

Comparative example

Polymer electrolyte production

PEO and LiFSI were mixed with acetonitrile in a molar ratio of EO/Li=20:1 to prepare a first polymer solution. PEGDA (polyethylene glycol diacrylate, Mn=575) is mixed with the first polymer solution to make 20 wt% of the total to prepare a second polymer solution, and then the second polymer solution is cast on a suitable release paper and dried to prepare a polymer electrolyte. Did. At this time, the thickness of the polymer electrolyte was 10 μm.

The ionic conductivity and mechanical strength of the polymer electrolyte are summarized in Table 1 below. The polymer electrolyte has the same physical and chemical properties as the positive electrode facing layer except for the thickness. Therefore, for the polymer electrolyte, refer to Table 1 below.

Battery Manufacturing

Next, the positive electrode, the polymer electrolyte, and the negative electrode were stacked in order, and the casing was prepared to prepare an all-solid-state battery. In addition to the polymer electrolyte, the positive electrode and the negative electrode were the same as in the examples.

Cathode facing layer Anode facing layer
(Comparative example polymer electrolyte) Shear modulus Ionic conductivity Shear modulus Ionic conductivity 60℃ 0.1MPa 2.5×10 ^-4 S/m 55.5MPa 3.5×10 ^-5 S/m 80℃ 0.002MPa 2.3×10 ^-3 S/m 3.9MPa 3.0×10 ^-4 S/m

Battery characteristics evaluation

For the batteries of Example 1 and Comparative Example 1, charging and discharging was repeated 100 times under conditions of charging at a constant current up to 4.2 V at 0.5 C and discharging at a constant current up to 2.5 V at 0.5 C to evaluate the capacity retention rate. This is illustrated in FIG. 4. According to this, it was confirmed that the battery prepared in Example 1 has higher cycle characteristics and coulomb efficiency than the battery prepared in Comparative Example. In the battery of the example, the growth of dendrites was suppressed so that no internal short circuit occurred, and stable life characteristics over 90 cycles were exhibited. On the other hand, it was confirmed that the battery of Comparative Example 1 deteriorated due to an internal short circuit in 20 to 30 cycles.

[Description of codes]

100... electrode assembly

110... anode

120...

130... polymer electrolyte

131... Cathode facing layer

132... Anode facing layer

140... polymer electrolyte of comparative example

Claims (13)

It includes a negative electrode, a positive electrode and a polymer electrolyte interposed between the negative electrode and the positive electrode, the polymer electrolyte includes two or more unit polymer electrolyte layers,
A cathode facing layer and an anode facing layer are respectively included on the outermost layer surface,
The negative electrode facing layer faces the negative electrode, and the positive electrode facing layer faces the positive electrode,
The cathode facing layer has a relatively high ion conductivity and a low mechanical strength compared to the anode facing layer,
The cathode facing layer has an ion conductivity of 3Х10 ^-4 S/cm to 1Х10 ^-2 S/cm, and a shear modulus of 1 Pa to 1Х10 ⁵ Pa,
The positive electrode facing layer is lower than the ion conductivity of the negative electrode facing layer in the range of 1Х10 ^-5 S/m or more and 1Х10 ^-3 S/cm, and the shear modulus is greater than 1Х10 ⁵ Pa and 1Х10 ¹⁰ Pa or less ,
The positive electrode facing layer includes a polymer resin and a lithium salt,
The polymer resin is an all-solid-state battery having a glass transition temperature greater than 80°C and less than 250°C and a crosslinking degree of 20% or more.
delete delete According to claim 1,
The negative electrode facing layer includes a polymer resin and a lithium salt, wherein the polymer resin has a minimum ion conductivity of 5×10 ^-4 s/cm and a maximum glass transition temperature of 80°C.
According to claim 4,
The polymer resin may include linear poly(ethylene oxide) (PEO); Comb-like PEO having a crosslinking moiety of 0 to 10%; A comb-shaped, star-shaped or branched polysiloxane having a crosslinking moiety of 0 to 20%, and polysilsesquioxane; Polyphosphazene; And polypropylene oxide; or a mixture comprising one or more mixtures selected from the group consisting of copolymers comprising one or more of them.
delete delete delete delete delete According to claim 1,
The polymer electrolyte includes a lithium salt, and the lithium salt is at least any one selected from the group consisting of LiFSI, LiCl, LiBr, LiI, LiPF6, LiBF4, LiSbF6, LiAsF6, LiClO4, LiCF3SO3, LiC4F9SO3 and LiN(SO2CF3)2 All-solid-state battery comprising one.
The all-solid-state battery according to claim 1, wherein the negative electrode is lithium metal.
The method of claim 12,
The positive electrode includes at least one selected from the group consisting of lithium cobalt oxide, lithium manganese oxide, lithium manganese-nickel-cobalt composite oxide, lithium metal oxide, lithium iron phosphate, sulfur, oxygen, lithium nickel manganese oxide as a positive electrode active material. One, all-solid-state battery.

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