KR20150016072A - Positive electrode for lithium ion capacitor and lithium ion capacitor comprising the same - Google Patents

Abstract

The present invention provides an anode for lithium ion capacitor and a lithium ion capacitor including the same including: a current collector; an anode active material including anode active material having graphene which is formed on one side of the current collector. The lithium ion capacitor can improve energy density when the lithium ion capacitor is charged and discharged.

Description

[0001] The present invention relates to a positive electrode for a lithium ion capacitor and a lithium ion capacitor including the positive electrode,

An anode for a lithium ion capacitor, and a lithium ion capacitor including the same. More specifically, the present invention relates to an anode for a lithium ion capacitor and a lithium ion capacitor including the same, wherein the energy density is improved to improve the rate characteristics and cycle characteristics of the lithium ion battery and the discharging capacity is improved as compared with general lithium ion capacitors.

Background Art [0002] Electric double layer capacitors (hereinafter referred to as " EDLC ") are conventionally used for a power source such as a bus copy machine, a regenerative energy storage for a hybrid electric vehicle (HEV), an uninterruptible power supply (UPS) The EDLC is a high output density so as to use an activated carbon as a cathode material and a cathode material and form a capacitance by physical ion adsorption to activated carbon. However, the energy density during charging and discharging is not large. The charging voltage of EDLC is about 2.5V maximum.

Among the structures of the EDLC, a negative electrode material is replaced by a material capable of absorbing and desorbing lithium ions from activated carbon, or the commercialization of lithium ion capacitors is progressing. The lithium ion capacitor is a hybrid structure with the EDLC and the lithium ion battery. As the cathode material, graphite, which is usually pre-doped with lithium ions, is used.

With this structure, the charging voltage of the lithium ion capacitor can be applied up to 4 V, and the energy density can be improved during charging and discharging as compared with EDLC using activated carbon for both electrodes. The energy density of lithium ion capacitors during charging and discharging is about 10 Wh / L. Which is about four times the EDLC. However, the energy density of lithium ion capacitors during charging and discharging is small compared with that of lithium ion batteries with an energy density of 100-600 Wh / L.

In order to use activated carbon for the positive electrode, the amount of lithium ions adsorbed on the positive electrode is smaller than that on the graphite electrode. Therefore, by using a cathode material having a large capacity, there is a possibility that the energy density can be remarkably improved when the lithium ion capacitor is charged and discharged. As a technique for improving the anode capacity in the past, there is an electric double layer capacitor using cup stack carbon nanotubes in place of activated carbon

Graphene is a material attracting attention recently due to its high electron conductivity and the like, and EDLC is mainly used as a conductive material. Graphene is a two-dimensional carbon material formed from an aqueous layer from one layer of graphite sheet. At the beginning of the discovery, a simple technique was used to peel off the graphite surface from the surface, and there was no high-quality, mass-production method that could withstand application. In recent years, however, various methods have been developed, such as a redox method and a method in which a supercritical fluid is used for peeling from graphite, and it becomes possible to obtain high quality graphene at a low cost.

As a use example of graphene, a positive electrode active material for a power storage device in which a main material made of a positive electrode active material such as lithium iron phosphate is coated on graphene is known. A capacitor having an electrode in which activated carbon, a metal oxide and a graphene are combined, and the like are known. There has been known a power storage device in which holes are formed in graphene and used as a conductive material. As exemplified above, graphene is attracted to good electron conductivity and is used as a conventional conductive material. However, an electrochemical device using graphene as a cathode active material has not been reported.

One aspect is to provide a positive electrode for a lithium ion capacitor in which the energy density during charging and discharging is improved to improve the rate characteristics and the cycle characteristics of the lithium ion battery and the discharging capacity is improved compared to a general lithium ion capacitor.

Another aspect of the present invention is to provide a lithium ion capacitor having improved energy density during charging and discharging, which improves the rate characteristics and cycle characteristics of the lithium ion battery and improves the discharging capacity compared with the lithium ion capacitor.

According to one aspect,

Collecting house; And

And a positive electrode active material layer including a positive electrode active material containing graphene formed on one surface of the current collector.

The graphene may comprise a single layer sheet or a plurality of sheets of two to ten layers.

The graphene may be laminated on one side of the current collector in a flat shape or may be arranged on one side of the current collector in a folded shape.

The graphene content may be 50 parts by weight or more based on 100 parts by weight of the cathode active material.

The cathode active material layer may further include a binder.

The binder may include polyvinylidene fluoride (PVdF), polyimide (PI), polyamideimide (PAI), chitosan, or styrene-butadiene rubber (SBR).

The discharge capacity of the anode may be 0.1 C or more and 60 mAh / g or more with respect to the weight of the anode at the time of one charge / discharge cycle.

According to another aspect,

The above-described anode;

A negative electrode including a negative electrode active material layer including a negative electrode active material disposed opposite to the positive electrode; And

And a nonaqueous electrolytic solution impregnated between the positive electrode and the negative electrode.

The negative electrode active material may include a carbon material capable of reversibly storing and releasing metal ions.

The negative electrode active material may be a carbon material pre-doped with lithium ions, a lithium metal, or an alloy based on lithium metal.

An anode for a lithium ion capacitor and a lithium ion capacitor including the same according to an aspect forms a coulomb type electrostatic capacity by redox reaction between anions and anions in graphene and a non-aqueous electrolyte. Also, the cathode active material contained in the anode forms a faraday-type electrostatic capacity by the ion adsorption ability of graphene. That is, by using graphene as the cathode active material, the present invention can form a Coulomb-type electrostatic capacity and a Faraday-type electrostatic capacity at the anode. As a result, the lithium ion secondary battery can have a higher energy density effect when charging and discharging than a general lithium ion capacitor, and can have a higher discharge density effect than a lithium ion secondary battery. Therefore, the lithium ion capacitor can be improved in the rate characteristics and the cycle characteristics as compared with the lithium ion battery, and the discharge capacity can be improved as compared with a general lithium ion capacitor.

1 is a schematic diagram of a lithium ion capacitor 100 according to one embodiment.
FIG. 2 is a graph showing the discharge capacities of the lithium ion capacitor and the lithium ion battery according to the number of cycles, manufactured by Example 1 and Comparative Examples 1 and 2. FIG.
3 is a graph showing the capacity retention ratios of the lithium ion capacitors and the lithium ion batteries according to the number of cycles, manufactured by Example 1 and Comparative Examples 1 and 2. FIG.
4 is a graph showing the rate characteristics of the lithium ion capacitor and the lithium ion battery manufactured in Example 1 and Comparative Examples 1 and 2. FIG.

Hereinafter, a lithium ion capacitor anode and a lithium ion capacitor including the same according to an embodiment of the present invention will be described in detail. The present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

In one aspect, the current collector; And a positive electrode active material layer containing a positive electrode active material containing graphene formed on one surface of the current collector. The cathode active material layer may be laminated on the collector surface.

[Positive Active Material Layer]

The main component of the positive electrode active material contained in the positive electrode active material layer is graphene. Graphene is a sheet in which a carbon atom forms a hexagonal lattice structure by sp ² bonds, and is characterized by high conductivity and large specific surface area.

The graphene may comprise a single layer sheet or a plurality of sheets of two to ten layers. Graphite is a structure in which sheets of the hexagonal lattice structure are interlayer bonded.

The graphene may be laminated on one side of the current collector in a flat shape or may be arranged on one side of the current collector in a folded shape. The graphene can obtain the action and effect of the present invention.

The anions in the non-aqueous liquid electrolyte contained in the lithium ion capacitor can be attracted to the positive electrode active material layer. Some of the negative ions attracted are adsorbed on the sheet surface of the graphene. And exhibits good anion adsorbability because the specific surface area of the graphene used is large. Since graphene has the same basic structure as graphite, the anion adsorbing ability on one side of the sheet is equivalent to that of graphite. In addition, in the interlayer and the folded sheet of the graphene composed of a plurality of layers, the anion can be adsorbed on both sides of the sheet, so that it exhibits higher anion adsorbing ability than graphite.

The positive electrode active material layer exhibits excellent anion adsorbing ability and forms a high Faraday-type electrostatic capacity. The emission density is mainly derived from an anion adsorption / desorption mechanism.

The graphene content may be 50 parts by weight or more based on 100 parts by weight of the cathode active material. For example, the graphene content may include 80 parts by weight or more based on 100 parts by weight of the cathode active material. For example, the graphene content may include 95 parts by weight or more based on 100 parts by weight of the cathode active material.

The cathode active material layer may further include a binder. Such a binder can maintain the skeleton structure of graphene. The binder may include, for example, polyvinylidene fluoride (PVdF), polyimide (PI), polyamideimide (PAI), chitosan, or styrene / stadiene rubber (SBR).

The content of the binder may be 5 to 50 parts by weight based on 100 parts by weight of the cathode active material. For example, the content of the binder may be 5 to 40 parts by weight based on 100 parts by weight of the cathode active material. For example, the content of the binder may be 10 to 40 parts by weight based on 100 parts by weight of the cathode active material. When the content of the binder is within the above range, the mechanical strength with the cathode active material can be improved and the change in volume during charging and discharging can be easily coped with. The thickness of the cathode active material layer may be, for example, 10 to 500 mu m.

In the cathode active material layer, an anion is brought into contact with an end portion of the graphene to cause a redox reaction. A coulombic electrostatic capacity can be formed by receiving electrons of the redox reaction. Accordingly, the positive electrode including the positive electrode active material layer containing the graphene-containing positive electrode active material can form a high electrostatic capacity comprising a Faraday-type electrostatic capacity and a coulombic electrostatic capacity, and can improve the energy density upon charge and discharge.

On the other hand, the end portions of the graphene can be largely classified into a zigzag type and an armchair type. Zigzag and armchair type movements of electrons are different from each other. At the end of the zigzag shape, the movement speed of the electrons is very fast, but it is very slow at the end of the armchair type. Therefore, depending on whether the anion is in contact with the zigzag or armature type end, the acceptance efficiency of the electrons by the oxidation-reduction reaction may be changed, and it may be considered to affect the improvement of the capacitance. Further, it is presumed that the anion is brought into contact with the end of the highly reactive mold, and the size of the end portion is not only optimized, but also the electrostatic capacity of the coulomb can be further improved.

The energy density of the positive electrode active material layer including the graphene-containing positive electrode active material can be improved during charging and discharging. Therefore, the lithium ion capacitor can be improved in the rate characteristic and the cycle characteristic as compared with the lithium ion battery, and the discharge capacity can be improved as compared with a general lithium ion capacitor.

The discharge capacity of the anode may be 0.1 C or more and 60 mAh / g or more with respect to the weight of the anode at the time of one charge / discharge cycle. For example, the discharge capacity of the anode may be at least 80 mAh / g with respect to the weight of the anode at one cycle charge and discharge at 0.1C.

The positive electrode active material layer does not exclude the addition of the conductive material, but the graphite has a high electrical conductivity, so that it has sufficient electric conductivity without adding a conductive material to the positive electrode active material layer. The conductive material which may be added may include, for example, carbon black, acetylene black, metal powder, or a mixture thereof. The positive electrode active material layer may contain other components as long as it does not impair the effect of the present invention.

The current collector may be in the form of a sheet or a mesh. For example, the current collector may include copper, aluminum, nickel, iron, steel, or stainless steel.

In another aspect, the above-described anode; A negative electrode including a negative electrode active material layer including a negative electrode active material disposed opposite to the positive electrode; And a nonaqueous electrolyte solution impregnated between the positive electrode and the negative electrode. The cathode active material layer and the anode active material layer may be laminated on the collector surface, respectively.

1 is a schematic diagram of a lithium ion capacitor 100 according to one embodiment.

1, reference numeral 100 is a lithium ion capacitor, 101 is a positive electrode active material layer, 102 is a nonaqueous electrolyte, 103 is a separator, 104 is a negative electrode active material layer, and 105 and 106 are current collectors. By applying a voltage, the anion can be attracted to the positive electrode in the non-aqueous liquid electrolyte, and the negative ions can be attracted to the negative electrode.

[Negative electrode active material layer]

The negative electrode active material may include a carbon material capable of reversibly storing and releasing metal ions. A known material having such a function can be used as the negative electrode active material. For example, the negative electrode active material may be a lithium-ion-based carbon material, a lithium metal, or a lithium-metal-based alloy.

The carbon material may be any material capable of forming an intercalation compound together with lithium ions. Examples of the carbon material include artificial graphite, natural graphite, graphitized carbon fiber, graphitized mesocarbon microbead, petroleum coke, hard carbon, soft carbon, An adult, a carbon fiber, a pyrolytic carbon, or a mixture thereof. For example, artificial graphite, natural graphite, or a mixture thereof.

Also, pre-doping can be performed according to a general method. For example, by impregnating a carbonaceous material such as graphite with a non-aqueous electrolyte to be described later at room temperature or above for a predetermined time.

As the lithium-based alloy, for example, a metal such as In-Li may be used. The thickness of the negative electrode active material layer may be, for example, 1 to 500 mu m.

The negative electrode active material layer may further include a binder in the same manner as the positive electrode active material layer. The positive electrode active material layer may contain a conductive material and other components as long as the effect of the present invention is not impaired. The binder and the kind and content of the conductive material are the same as those described in the positive electrode active material layer, and a description thereof will be omitted.

[Non-aqueous liquid electrolyte]

The non-aqueous liquid electrolyte may include a non-aqueous organic solvent and a lithium salt. As the non-aqueous liquid electrolyte, an electrolyte salt dissolved in a non-aqueous organic solvent may be used.

Examples of the non-aqueous organic solvent include cyclic carbonates such as ethylene carbonate (EC), propylene carbonate, butylene carbonate and vinylene carbonate; and cyclic carbonates such as diethyl carbonate (DEC), dimethyl carbonate (DMC) Chain carbonate and the like can be used.

The non-aqueous liquid electrolyte may further contain an ionic liquid. The ionic liquid may be, for example, N, N-diethyl-N-ethyl-N- (2-methoxyethyl) ammonium miss (trifluorosulfonyl) imide, N- (Trifluorosulfonyl) imide, 1-methyl-3-propylimidazolium bis (trifluorosulfonyl) imide, or 1-ethyl-3-butyl imidazolium tetrafluoroborate . The organic solvent and the ionic liquid may be used alone or in combination of two or more.

The lithium salt may be, for example, lithium chloride (LiCl), lithium fluoride (FCl), lithium perchlorate (LiClO ₄ ), lithium borofluoride (LiBF ₄ ), LiAsF ₆ , LiPF ₆ , Li (CF ₂ SO ₂ ) ₂ N Can be listed. The content of the lithium salt may be 0.1 to 3.0 mol% with respect to the non-aqueous organic solvent, and may be, for example, 0.7 to 1.3 mol% with respect to the non-aqueous organic solvent.

[Lithium Ion Capacitor]

The positive electrode active material layer and the negative electrode active material layer are respectively laminated on the surface of a current collector to form a positive electrode and a negative electrode as a positive electrode material and a negative electrode material. The lithium ion capacitor may further include a separator between the anode and the cathode. The lithium ion capacitor is formed by depositing a laminate in which the separator is disposed in a non-aqueous liquid electrolyte. The above-described graphene is used for the positive electrode active material layer to provide a capacitance of a coulomb type and a paradigm type, and a lithium ion capacitor having a high energy density upon charge and discharge. In addition, the lithium ion capacitor is also superior in discharge density to a lithium ion secondary battery.

As the separator, a known porous film such as polyethylene or polypropylene may be used. As the current collector material, a known conductive material can be used. For example, a sheet and film made of aluminum, copper, nickel, titanium, or the like can be used. The conductive material may be used alone or as an alloy.

[Manufacturing Method of Lithium Ion Capacitor]

A manufacturing method of the lithium ion capacitor will be described by taking the laminated structure disclosed in Fig. 1 as an example. In the following description, lithium metal is used as the positive electrode active material.

The positive electrode active material layer may be formed by applying a slurry obtained by mixing the graphene and a binder in a solvent to the surface of the current collector until the thickness reaches about 10 to 500 mu m and drying the slurry. The solvent of the slurry may be, for example, N-methyl-2-pyrrolidone (NMP), N, N-dimethylacetamide, N, N-dimethylformamide or isopropyl alcohol. The slurry is prepared by adding graphene and a binder to the solvent in an amount of 50 to 95 parts by weight of graphene and 5 to 50 parts by weight of graphene per 100 parts by weight of the slurry and stirring until the ingredients of the raw material are homogeneously dispersed. In the slurry, a dispersant, a thickener, and the like may be appropriately added. Alternatively, a solvent may be used to form the pellet by mixing only the graphene and the binder in the above composition without forming the slurry.

The negative electrode active material layer may be formed by laminating a negative electrode active material, which is capable of reversibly storing and releasing metal ions, on the current collector surface. When a lithium metal is used, the lithium metal foil can be pressed onto the current collector.

When graphite is used as the negative electrode active material, a slurry is prepared in which graphite is homogeneously dispersed in a solvent. The obtained graphite slurry is applied to a current collector and dried to form a negative electrode active material layer. The thickness of the negative electrode active material layer may be about 1 to 500 mu m. When a carbon material is used, pre-doping can be performed by interposing lithium ions using a known method.

In the above-described method, a laminate in which a separator is sandwiched between a positive electrode having a positive electrode active material layer formed on the surface of the collector and a negative electrode having a negative electrode active material layer formed on the surface of the current collector is disposed in the case, Inject. After the non-aqueous liquid electrolyte is injected, the case is sealed to avoid reaction with moisture in the atmosphere. The shape of the case may be a coin shape, a spiral shape, a square shape, or the like.

Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto.

In addition, contents not described here can be inferred sufficiently technically if they are skilled in the art, and a description thereof will be omitted.

 [Example]

Production Example 1: Anode for Lithium Ion Capacitor

While adding isopropyl alcohol, 4.75 g of graphene as a cathode active material and 0.25 g of PVdF as a binder were mixed using a pestle bowl to form a slurry. The slurry was applied to the surface of a copper current collector in a sheet form (thickness: 20 mu m) and rolled into a sheet having a thickness of 100 mu m using a roll press. The sheet was punched out into pellets having a diameter of 16 mm and vacuum dried to prepare a positive electrode.

Comparative Preparation Example 1: anode for lithium ion capacitor

While adding isopropyl alcohol, 4.75 g of activated carbon having a surface area of 1500 m ² / g as a cathode active material and 0.25 g of PVdF as a binder were mixed using a mortar to form a slurry. The slurry was applied to the surface of a copper current collector in a sheet form (thickness: 20 mu m) and rolled into a sheet having a thickness of 100 mu m using a roll press. The sheet was punched out into pellets having a diameter of 16 mm and vacuum dried to prepare a positive electrode.

Comparative Preparation Example 2: anode for lithium ion battery

While adding N-methyl-2-pyrrolidone (NMP), 4.85 g of LiCoO ₂ and 0.15 g of PVDF as a cathode active material were mixed using a mortar to form a slurry. The slurry was applied to the surface of a copper current collector in a sheet form (thickness: 20 mu m) and rolled into a sheet having a thickness of 100 mu m using a roll press. The sheet was punched out into pellets having a diameter of 16 mm and vacuum dried to prepare a positive electrode.

Example 1: Preparation of lithium ion capacitor

The positive electrode prepared in Production Example 1 was prepared. A lithium metal film was pressed on a current collector to produce a negative electrode. A laminate having a polyethylene thin film disposed as a separator between the positive electrode and the negative electrode was assembled. Aqueous electrolyte solution was prepared by dissolving LiPF ₄ in a mixed solution of ethylene carbonate (EC) and diethyl carbonate (DEC) until the amount of LiPF ₄ became 1M.

The laminate was placed inside the coin cell type case, and an electrolyte solution was injected and sealed to prepare a lithium ion capacitor.

Comparative Example 1: Manufacture of lithium ion capacitor

A lithium ion capacitor was prepared in the same manner as in Example 1, except that the positive electrode prepared in Comparative Preparation Example 1 was used instead of the positive electrode prepared in Preparation Example 1 above.

Comparative Example 2: Manufacture of lithium ion battery

A lithium ion battery was produced in the same manner as in Example 1 except that the positive electrode prepared in Comparative Preparation Example 2 was used instead of the positive electrode prepared in Production Example 1. [

 (Discharge Capacity, Rate Characteristics, and Cycle Characteristics Experiment)

Evaluation example 1: Discharge capacity, rate characteristic and cycle characteristic experiment

The lithium ion capacitor and the lithium ion battery produced in Example 1 and Comparative Examples 1 and 2 were charged at a constant current of 0.1 C at 25 캜, at an upper limit voltage of 4.7 V in Example 1 and Comparative Example 1, The discharge capacity of the discharge cell was increased up to the upper limit voltage of 4.4 V and the initial charge capacity was measured. The discharge end voltage of 2.0 V in Example 1 and Comparative Example 1 and the discharge end voltage of 2.7 V in Comparative Example 2 Lt; RTI ID = 0.0 > C < / RTI > Subsequently, charging and discharging were repeated 60 times in the same current and voltage section. (The discharge capacity in 60 cycles / the discharge capacity in one cycle) 100) was measured after repeating the cycle of 60 times, and the capacity maintenance ratio (%, the discharge capacity in 60 cycles / the discharge capacity in one cycle) The properties were evaluated.

Separately, the lithium ion capacitor and the lithium ion battery manufactured in Example 1 and Comparative Examples 1 and 2 were charged at a constant current of 0.1 C at 25 캜, at an upper limit voltage of 4.7 V in Example 1 and Comparative Example 1, and In Comparative Example 2, discharge was carried out until the upper limit voltage of 4.4 V was reached. In Example 1 and Comparative Example 1, the discharge end voltage was 2.0 V, and in Comparative Example 2, 0.1 C discharge Respectively. After one cycle, the ratio of the discharge capacity at 1 C to the discharge capacity at 0.1 C was measured to evaluate the rate characteristics.

Then, the lithium ion capacitor prepared in Example 1 and Comparative Example 1 was charged at a constant current of 0.1 C at 25? Until the upper limit voltage reached 4.7 V, the initial discharge capacity was measured, and then the discharge end voltage 10 C discharge was performed until it reached 2.0 V. The results are shown in Table 1 and Figs. 2 to 4, respectively.

division Anode configuration Per anode weight
Discharge capacity
(mAh / g) Cycle characteristics (%)
(Capacity after 60 cycles)
Retention rate) Rate characteristic (%)
(1C / 0.1C) Example 1 Graphene cathode active material 85.1 0.95 0.85 Comparative Example 1 Activated carbon cathode active material 13.4 1.05 0.95 Comparative Example 2 LiCoO ₂ cathode active material 123.4 0.91 0.64

Referring to Table 1 and FIGS. 2 to 4, the discharge capacity of the anode included in the lithium ion capacitor manufactured in Example 1 was 60 mAh / g or more based on the anode weight. The discharge capacity of the anode included in the lithium ion capacitor manufactured in Example 1 was improved by about 6 times or more as compared with the discharge capacity of the anode included in the general lithium ion capacitor manufactured in Comparative Example 1. [

The cycle characteristics of the lithium ion capacitor produced in Example 1 were improved by about 1.04 times as compared with the lithium ion battery produced in Comparative Example 2. [ The rate characteristics of the lithium ion capacitor produced by Example 1 were improved by about 1.3 times as compared with the lithium ion battery produced by Comparative Example 2. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

100: lithium ion capacitor, 101: positive electrode active material layer
102: non-aqueous electrolyte, 103: separator
104: anode active material layer, 105: collector

Claims (18)

Collecting house; And
And a positive electrode active material layer containing a positive electrode active material containing graphene formed on one surface of the current collector.  The positive electrode for a lithium ion capacitor according to claim 1, wherein the graphene comprises a single layer sheet or a plurality of sheets of two to ten layers.  The positive electrode for a lithium ion capacitor according to claim 1, wherein the graphene is laminated on one surface of the current collector in a flat shape or is disposed on one surface of the current collector in a folded form.  The positive electrode for a lithium ion capacitor according to claim 1, wherein the content of the graphene is 50 parts by weight or more based on 100 parts by weight of the positive electrode active material.  The positive electrode for a lithium ion capacitor according to claim 1, wherein the content of graphene is 80 parts by weight or more based on 100 parts by weight of the positive electrode active material.  The positive electrode for a lithium ion capacitor according to claim 1, wherein the positive electrode active material layer further comprises a binder.  The positive electrode for a lithium ion capacitor according to claim 6, wherein the binder comprises polyvinylidene fluoride (PVdF), polyimide (PI), polyamideimide (PAI), chitosan or styrene-butadiene rubber (SBR).  The positive electrode for a lithium ion capacitor according to claim 6, wherein the content of the binder is 5 to 50 parts by weight based on 100 parts by weight of the positive electrode active material.  The positive electrode for a lithium ion capacitor according to claim 1, wherein the thickness of the positive electrode active material layer is 10 to 500 占 퐉.  The positive electrode for a lithium ion capacitor according to claim 1, wherein the positive electrode has a discharge capacity of 0.1 C or more and 60 mAh / g or more based on the weight of the positive electrode during one cycle charge / discharge cycle.  The positive electrode for a lithium ion capacitor according to claim 1, wherein the current collector is in the form of a sheet or a mesh. A cathode according to any one of claims 1 to 11;
A negative electrode including a negative electrode active material layer including a negative electrode active material disposed opposite to the positive electrode; And
And a non-aqueous electrolyte impregnated between the positive electrode and the negative electrode.  13. The lithium ion capacitor according to claim 12, wherein the negative electrode active material comprises a carbon material capable of reversibly storing and releasing metal ions.  13. The lithium ion capacitor according to claim 12, wherein the negative electrode active material is a lithium-ion-based carbon material, a lithium metal, or a lithium metal-based alloy.  13. The lithium ion capacitor of claim 12, wherein the thickness of the negative active material layer is 1 to 500 mu m.  13. The lithium ion capacitor of claim 12, wherein the non-aqueous liquid electrolyte comprises a non-aqueous organic solvent and a lithium salt.  17. The lithium ion capacitor of claim 16, wherein the lithium ion capacitor further comprises an ionic liquid in the non-aqueous liquid electrolyte.  13. The lithium ion capacitor according to claim 12, further comprising a separator disposed between the anode and the cathode.

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