JP2002231250A - Lithium ion secondary battery and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the conductivity of a conventional lithium ion secondary battery. SOLUTION: This lithium ion secondary battery comprises a positive electrode-side collector 1, a positive electrode layer 2 having a positive electrode- side active material containing at least lithium, a separator 3 containing an electrolyte, a negative electrode layer 4 having a negative electrode-side active material, and a negative electrode-side collector 5, and the positive electrode layer 2 and/or the negative electrode layer 4 includes at least one kind of carbon black and at least one kind of graphite carbon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium ion secondary battery.

[0002]

2. Description of the Related Art In recent years, the performance of portable electronic devices such as cellular phones and personal digital assistants largely depends on rechargeable batteries as well as on-board semiconductor elements and electronic circuits. At the same time, it is desired to realize light weight and compactness at the same time. Heretofore, lead batteries and nickel cadmium batteries have been used for these batteries, but it has been difficult to cope with a reduction in weight and size due to insufficient energy density.

[0003] Therefore, a nickel-metal hydride battery having an energy density approximately twice that of a nickel-cadmium battery has been developed, and then a lithium-ion battery having a higher energy density has been developed and has been spotlighted.

[0004]

Since these lithium ion secondary batteries are used for mobile phones or personal digital assistants, further improvement in safety is desired, especially when the batteries generate heat due to overcharging or the like. It is important to prevent thermal runaway. In addition, a battery having particularly good high-rate characteristics as a battery that can withstand rapid charging and discharging is also desired.

[0005] As means for preventing such thermal runaway, a method using an electronic circuit equipped with an overcharge prevention mechanism, a method using a mechanical current interrupt utilizing gas generation during overcharge, and the like have been proposed.

However, in these methods, the battery has an additional structure, which not only increases the cost of the battery but also imposes restrictions on the product design.

A conventional lithium ion secondary battery is:
There was also a problem that the conductivity was not good.

An object of the present invention is to provide a lithium ion secondary battery having good conductivity and a method of manufacturing the same in consideration of the above problems.

[0009]

Means for Solving the Problems The first invention (claim 1)
Corresponds to) a positive electrode side current collector, a positive electrode layer having a positive electrode side active material containing at least lithium, a separator containing an electrolytic solution, a negative electrode layer having a negative electrode side active material, and a negative electrode side current collector. The positive electrode layer and / or the negative electrode layer is a lithium ion secondary battery including at least one type of carbon black and at least one type of graphite carbon.

According to a second aspect of the present invention (corresponding to claim 2), a positive electrode current collector, a positive electrode layer having a positive electrode active material containing at least lithium, a separator containing an electrolytic solution, and a negative electrode active material are provided. A method for manufacturing a lithium ion secondary battery including a negative electrode layer having a negative electrode side current collector, wherein the positive electrode layer comprises:
At least one or more types of carbon black are added to a predetermined solvent to disperse the carbon black, and then, the positive electrode side active material and at least one type of powdered graphite carbon are mixed with the positive electrode side active material and the graphite. This is a method for producing a lithium ion secondary battery formed by forming a sheet of the solvent containing the carbon black, the positive electrode side active material and the graphite carbon in addition to dispersing carbon, and drying the sheet.

According to a third aspect of the present invention (corresponding to claim 3), a positive electrode side current collector, a positive electrode layer having a positive electrode side active material containing at least lithium, a separator containing an electrolytic solution, and a negative electrode side active material are provided. A method for manufacturing a lithium ion secondary battery including a negative electrode layer having a negative electrode side current collector, wherein the negative electrode layer comprises:
At least one or more types of carbon black are added to a predetermined solvent to disperse the carbon black, and then, the negative electrode side active material and at least one type of powdered graphite carbon are mixed with the negative electrode side active material and the graphite. This is a method for producing a lithium ion secondary battery formed by forming a sheet of the solvent containing the carbon black, the negative electrode side active material and the graphite carbon in addition to dispersing carbon, and drying the sheet.

A fourth aspect of the present invention (corresponding to claim 4) is to provide a positive electrode side current collector, a positive electrode layer having a positive electrode side active material containing at least lithium, a separator containing an electrolytic solution, and a negative electrode side active material. A method for manufacturing a lithium ion secondary battery including a negative electrode layer having a negative electrode side current collector, wherein the positive electrode layer comprises:
At least one or more conductive agent and the positive electrode active material are added to a predetermined solvent, and the solvent containing the conductive agent and the positive electrode active material is stirred in a vacuum of 10 Pa or more and 1 × 10 ⁵ Pa or less. The method according to claim 1, wherein the conductive agent is dispersed, and the solvent in which the conductive agent is dispersed is formed into a sheet.

A fifth aspect of the present invention (corresponding to claim 5) comprises a positive electrode side current collector, a positive electrode layer having a positive electrode side active material containing at least lithium, a separator containing an electrolytic solution, and a negative electrode side active material. A method for manufacturing a lithium ion secondary battery including a negative electrode layer having a negative electrode side current collector, wherein the negative electrode layer comprises:
At least one or more conductive agent and the negative electrode active material are added to a predetermined solvent, and the solvent containing the conductive agent and the negative electrode active material is stirred in a vacuum of 10 Pa or more and 1 × 10 ⁵ Pa or less. The method according to claim 1, wherein the conductive agent is dispersed, and the solvent in which the conductive agent is dispersed is formed into a sheet.

As described above, in the lithium ion secondary battery and the lithium ion secondary battery manufactured by the method for manufacturing a lithium ion secondary battery according to the present invention, the electric resistance of the positive electrode or the negative electrode plate is a conventional one. The rate characteristics are improved due to the smaller size, and the conductive area is attached to the surface of the active material in the positive electrode and the negative electrode, so that the reaction area can be controlled and gas generation during charge / discharge can be suppressed. Can be.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a lithium ion secondary battery according to an embodiment of the present invention will be described. FIG. 1 shows a configuration of a lithium ion secondary battery. As shown in FIG. 1, the lithium ion secondary battery includes a positive electrode current collector 1, a positive electrode layer 2, a separator 3, a negative electrode layer 4, and a negative electrode current collector 5. The layer 2 is provided on the positive electrode current collector 1, the negative electrode layer 4 is provided on the negative electrode current collector 5, and the separator 3 is sandwiched between the positive electrode layer 2 and the negative electrode layer 4.

The structure of the lithium ion secondary battery will be further described. The positive electrode has a structure in which a positive electrode layer 2 is laminated on a positive electrode current collector 1. The current collector 1 is made of an aluminum foil or an aluminum net.

On the other hand, the negative electrode has a negative electrode layer 4 on the negative electrode side current collector 5.
And the negative electrode layer 4 is disposed so as to face the positive electrode layer 2 of the positive electrode. The negative electrode side current collector 5
Is made of, for example, a copper foil or a copper net.

Hereinafter, the positive electrode layer 2 and the negative electrode layer 4 will be described.

The positive electrode layer 2 contains an active material, a conductive material, a non-aqueous electrolyte, and a binder resin. Examples of the active material include lithium manganese composite oxide, lithium-containing nickel oxide, lithium-containing cobalt oxide, lithium-containing cobalt nickel oxide, and various oxides such as amorphous vanadium pentoxide containing lithium. Can be used.

Examples of the conductive material include carbon black such as artificial graphite and acetylene black. Further, graphite carbon obtained by firing carbon black and having higher conductivity than carbon black can also be used.

Further, the electrolytic solution is prepared by dissolving the electrolyte in a non-aqueous solvent. Examples of the non-aqueous solvent include ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate,
Diethyl carbonate, γ-butyrolactone, sulfolane, acetonitrile, 1,2-dimethoxyethane, 1,3
-Dimethoxypropane, diethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, γ-butyrolactone and the like. The non-aqueous solvents may be used alone or in combination of two or more.

Examples of the electrolyte contained in the nonaqueous electrolyte include lithium perchlorate (LiClO ₄ ), lithium hexafluorophosphate (LiPF ₆ ), lithium borofluoride (LiBF ₄ ), and the like.
Lithium salts such as lithium arsenic hexafluoride (LiAsF ₆ ), lithium trifluorometasulfonate (LiCF ₃ SO ₃ ), and lithium bistrifluoromethylsulfonylimide [LiN (CF ₃ SO ₂ ) ₂ ] can be given.

As the binder resin, for example, polyvinylidene difluoride (PVdF), acrylic resin, acrylic rubber, styrene-butadiene rubber, fluorine rubber,
Vinylidene fluoride-hexafluoropropylene (VD
F-HFP) can be used. VDF contributes to the improvement of the mechanical strength in the skeleton of the copolymer, and HFP is incorporated as amorphous in the copolymer, and functions as a holding portion for the electrolyte and a lithium ion transmission portion. These binder resins may be used alone or in combination of two or more.

The negative electrode layer 4 is made of a carbon-based material that stores lithium ions, a non-aqueous electrolyte, and a binder resin.

Examples of the carbon-based material include a material obtained by firing an organic polymer compound (for example, phenol resin, polyacrylonitrile, cellulose, etc.), a material obtained by firing coke or pitch, or an artificial material. Examples include graphite and natural graphite. As the non-aqueous electrolyte and the binder resin, the same ones as described in the above-described positive electrode layer are used.

The negative electrode layer 4 may contain carbon black or graphite carbon.

As described above, when carbon black and graphite carbon are contained in the positive electrode layer 2 and / or the negative electrode layer 4, the conductivity of the lithium ion secondary battery is improved.

Next, a method for manufacturing the positive electrode layer 2 or the negative electrode layer 4 containing carbon black and graphite carbon will be described. The method is to add at least one or more types of carbon black to a predetermined solvent to disperse the carbon black, and then, a positive electrode or a negative electrode side active material and at least one or more types of powdered graphite carbon, In this method, a solvent containing carbon black, an active material and graphite carbon is formed into a sheet in addition to dispersing the active material and the graphite carbon, and the sheet is dried to produce a sheet.

Further, as a method for manufacturing the positive electrode layer 2 and the negative electrode layer 4, the following manufacturing method can be used. The method includes adding at least one kind of conductive agent and a positive electrode side or a negative electrode side active material to a predetermined solvent, and forming a solvent containing the conductive agent and the active material in a vacuum of 10 Pa or more and 1 × 10 ⁵ Pa or less. And agitating the stirred solvent to form a sheet, followed by drying.

Since the conductive agent is dispersed in the stirring step, the conductivity of the lithium ion secondary battery is improved. In addition, as a conductive agent, carbon black, graphite carbon, etc. correspond.

[0031]

Embodiments of the present invention will be described below in detail.

(Example 1) A positive electrode layer was prepared as follows. (The following composition is a ratio based on 100 parts by weight of lithium-containing cobalt acid as an active material.) Acetylene black as a conductive material (primary particle diameter: 0.0
5 μm, hereinafter AB) and graphite carbon, each 3 parts by weight, polyvinylidene difluoride (hereinafter PVdF) as a binder resin 2 parts by weight, and a solvent N-
After kneading methyl-2-pyrrolidone (hereinafter referred to as NMP) at a ratio of 10 parts by weight, NMP was further added at 40 parts by weight to prepare a conductive material paint. 100 parts by weight of lithium-containing cobalt acid (primary particle diameter: 5 μm) as an active material was added to the conductive material paint, and stirred to obtain a positive electrode paint. This positive electrode paint was formed into a film on an aluminum foil with a doctor blade, allowed to stand at room temperature, and naturally dried to prepare a sheet-shaped positive electrode having a thickness of 100 μm.

The negative electrode layer was prepared as follows. (The following composition is a ratio to 100 parts by weight of graphite carbon as an active material.) Graphite carbon as an active material (primary particle diameter: 20
μm) and 100 parts by weight of PVdF as a binder resin.
0 parts by weight and 100 parts by weight of NMP as a solvent were mixed to obtain a negative electrode paint. This negative electrode paint was formed into a copper foil by a doctor blade, allowed to stand at room temperature, and naturally dried to a thickness of 150 μm.
m sheet-shaped negative electrode was produced.

Next, the sheet-like electrolyte layer is interposed between the positive electrode layer and the negative electrode layer, and the laminate is made of lithium hexafluorophosphate (LiPF ₆ ) with ethylene carbonate (EC).
The above-described lithium ion secondary battery was prepared by immersing the laminate in an electrolytic solution dissolved in 1 mol of the lithium ion secondary battery.

Example 2 A positive electrode layer was prepared as follows.

Lithium-containing cobalt acid (primary particle size: 5
μm), 100 parts by weight of AB, 3 parts by weight of AB, and 2 parts by weight of PVdF.
Parts by weight and NMP at a ratio of 15 parts by weight.
After adding 35 parts by weight of P, the mixture was stirred to prepare a positive electrode paint. This positive electrode paint was formed into a film on an aluminum foil by a doctor blade, allowed to stand at room temperature, and naturally dried to form a sheet-shaped positive electrode having a thickness of 100 μm.

The negative electrode layer was prepared as follows.

One part by weight of acetylene black as a conductive material and 1 part by weight of graphite carbon, and 1 part of polyvinylidene difluoride (hereinafter referred to as PVdF) as a binder resin were added.
After 0 parts by weight and 50 parts by weight of N-methyl-2-pyrrolidone (hereinafter referred to as NMP) as a solvent were kneaded, NM was further added.
P was added by 50 parts by weight to prepare a conductive material paint. Graphite carbon (primary particle size: 20μ)
m) was added and stirred to obtain a negative electrode paint.
This negative electrode paint is formed on a copper foil with a doctor blade,
The sheet-shaped negative electrode having a thickness of 150 μm was formed by standing at room temperature and naturally drying.

A lithium ion secondary battery was prepared in the same manner as in Example 1 except for the above.

(Example 3) Acetylene black (primary particle diameter: 0.05 μm, hereinafter referred to as AB) as a conductive material and 3 parts by weight of graphite carbon each were used, and polyvinylidene difluoride (hereinafter referred to as PVdF) as a binder resin was used. 2
Parts by weight and N-methyl-2-pyrrolidone (hereinafter referred to as NMP) as a solvent in a ratio of 10 parts by weight.
Was added to prepare a conductive material paint. At this time, 1
A paint was prepared in a vacuum of × 10 ² Pa. 100 parts by weight of lithium-containing cobalt acid is added to this conductive material paint,
A lithium ion secondary battery was prepared in the same manner as in Example 1 except that a positive electrode paint was obtained after stirring.

Example 4 One part by weight of acetylene black (primary particle diameter: 0.05 μm, hereinafter referred to as AB) and 1 part by weight of graphite carbon as conductive materials, and polyvinylidene difluoride (hereinafter referred to as PVdF) as a binder resin 2
Parts by weight and N-methyl-2-pyrrolidone (hereinafter referred to as NMP) as a solvent in a ratio of 10 parts by weight.
Was added to prepare a conductive material paint. 100 parts by weight of graphite carbon was added to the conductive material paint,
After stirring the paint in a vacuum of × 10 ² Pa, a lithium ion secondary battery was prepared in the same manner as in Example 1, except that a positive electrode paint was obtained.

Example 5 A positive electrode layer was prepared as follows. (The following composition is a ratio to 100 parts by weight of lithium-containing cobalt acid as an active material.) Acetylene black as a conductive material (primary particle diameter: 0.0
5 μm, 3 parts by weight of AB), 2 parts by weight of polyvinylidene difluoride (hereinafter, PVdF) as a binder resin,
N-methyl-2-pyrrolidone as a solvent (hereinafter NMP)
Was kneaded at a ratio of 10 parts by weight, and 40 parts by weight of NMP was further added to prepare a conductive material paint. To this conductive material paint, lithium-containing cobalt acid as an active material (primary particle diameter: 5 μm)
m) and 3 parts by weight of graphite carbon were added and stirred to obtain a positive electrode paint. A lithium ion secondary battery was prepared in the same manner as in Example 1 except that a film of this positive electrode paint was formed on an aluminum foil with a doctor blade, and was allowed to stand at room temperature and naturally dried to prepare a sheet-shaped positive electrode having a thickness of 100 μm. did.

Example 6 1 part by weight of acetylene black (primary particle diameter: 0.05 μm, hereinafter AB) as a conductive material and 10 parts by weight of polyvinylidene difluoride (PVdF) as a binder resin were used. N-methyl-2 as a solvent
After kneading 50 parts by weight of pyrrolidone (hereinafter referred to as NMP), 50 parts by weight of NMP was further added to prepare a conductive material paint. Example 1 was repeated except that 100 parts by weight of graphite carbon as an active material (primary particle diameter: 20 μm) and 1 part by weight of graphite carbon as a conductive material were added to the conductive material paint and stirred to obtain a negative electrode paint. Similarly, a lithium ion secondary battery was prepared.

Example 7 Acetylene black (primary particle diameter: 0.05 μm, hereinafter AB) and 3 parts by weight of graphite carbon as conductive materials and polyvinylidene difluoride (hereinafter PVdF) as binder resin were used. 2
After kneading 10 parts by weight of N-methyl-2-pyrrolidone (hereinafter referred to as NMP) as a solvent,
Was added to prepare a conductive material paint. At this time 10
A paint was prepared in a vacuum of Pa. A lithium ion secondary battery was prepared in the same manner as in Example 1, except that 100 parts by weight of lithium-containing cobalt acid was added to the conductive material paint and stirred to obtain a positive electrode paint.

(Example 8) Acetylene black (primary particle diameter: 0.05 μm, hereinafter referred to as AB), which is a conductive material, and 3 parts by weight of graphite carbon, respectively, and polyvinylidene difluoride (hereinafter, referred to as PVdF) as a binder resin were used. 2
Parts by weight and N-methyl-2-pyrrolidone (hereinafter referred to as NMP) as a solvent in a ratio of 10 parts by weight.
Was added to prepare a conductive material paint. At this time 1 ×
A paint was prepared in a vacuum of 10 ⁵ Pa. A lithium ion secondary battery was prepared in the same manner as in Example 1 except that 100 parts by weight of lithium-containing cobalt acid was added to the conductive material paint and stirred to obtain a positive electrode paint.

Comparative Example 1 A positive electrode layer was formed as follows.

100 parts by weight of lithium-containing cobalt acid,
6 parts by weight of AB, 2 parts by weight of PVdF, and 15 parts by weight of NMP were kneaded, and 35 parts by weight of NMP were added, followed by stirring to prepare a positive electrode paint. A lithium ion secondary battery was prepared in the same manner as in Example 1 except that a film of this positive electrode paint was formed on an aluminum foil with a doctor blade, and was allowed to stand at room temperature and naturally dried to form a sheet-shaped positive electrode having a thickness of 100 μm. Created.

Comparative Example 2 2 parts by weight of acetylene black as a conductive material, 10 parts by weight of polyvinylidene difluoride (hereinafter referred to as PVdF) as a binder resin, and N as a solvent
-Methyl-2-pyrrolidone (hereinafter referred to as NMP) was kneaded at a ratio of 50 parts by weight, and 50 parts by weight of NMP was further added to prepare a conductive material paint. 100 parts by weight of graphite carbon (primary particle diameter: 20 μm) was added to the conductive material paint and stirred to obtain a negative electrode paint. This negative electrode paint was formed into a film on a copper foil by a doctor blade, allowed to stand at room temperature, and naturally dried to form a 150-μm-thick sheet-shaped negative electrode.

A lithium ion secondary battery was prepared in the same manner as in Example 1 except for the above.

Comparative Example 3 A positive electrode layer was formed as follows. (The following composition is a ratio based on 100 parts by weight of lithium-containing cobalt acid as an active material.) Acetylene black as a conductive material (primary particle diameter: 0.0
5 μm, hereinafter AB) and 3 parts by weight of graphite carbon, 2 parts by weight of polyvinylidene difluoride (PVdF) as a binder resin, and 10 parts of N-methyl-2-pyrrolidone (NMP) as a solvent. After kneading at a ratio of parts by weight, 40 parts by weight of NMP was further added to prepare a conductive material paint. 100 parts by weight of lithium-containing cobalt acid (primary particle diameter: 5 μm) as an active material was added to the conductive taste paint, and stirred under a vacuum of 1 × 10 ⁶ Pa to obtain a positive electrode paint. This positive electrode paint is formed on an aluminum foil with a doctor blade, allowed to stand at room temperature, and naturally dried to a thickness of 10 μm.
A sheet-shaped positive electrode of 0 μm was prepared.

A lithium ion secondary battery was prepared in the same manner as in Example 1 except for the above.

(Comparative Example 4) A positive electrode layer was prepared as follows. (The following composition is a ratio to 100 parts by weight of lithium-containing cobalt acid as an active material.) Acetylene black as a conductive material (primary particle diameter: 0.0
5 μm, hereinafter AB) and 3 parts by weight of graphite carbon, 2 parts by weight of polyvinylidene difluoride (hereinafter, PVdF) as a binder resin, and 10 parts of N-methyl-2-pyrrolidone (hereinafter, NMP) as a solvent. After kneading at a ratio of parts by weight, 40 parts by weight of NMP was further added to prepare a conductive material paint. 100 parts by weight of lithium-containing cobalt acid (primary particle diameter: 5 μm) as an active material was added to the conductive taste paint, and the mixture was stirred under a vacuum of 1 × 10 ⁻¹ Pa to obtain a positive electrode paint. This positive electrode paint is formed on an aluminum foil with a doctor blade, allowed to stand at room temperature, and naturally dried to a thickness of 10 μm.
A sheet-shaped positive electrode of 0 μm was prepared.

A lithium ion secondary battery was prepared in the same manner as in Example 1 except for the above.

The battery thus prepared was measured in volume, charged in a constant current mode of 0.2 C (100 mA), and then charged in a constant voltage mode of 4.2 V. Next, 0.2C (100mA), 1C (500m
A) Discharge was performed at a current density of 2 C (1000 mA), and capacity was confirmed at a discharge voltage of 3 V. Here, the volume change rate was calculated assuming that the volume before charging was 0%. The capacity retention after 100 cycles was also measured.

The results are shown in Table 1.

[0056]

[Table 1]

As shown in Table 1, it can be seen that when graphite carbon is contained in the positive electrode or the negative electrode, the conductivity in the electrode plate is improved, and the cycle characteristics are improved (Examples 1 and 2).

When vacuum degassing is performed when the conductive pastes of the positive electrode and the negative electrode are dispersed, the dispersibility of the conductive material is improved, and the cycle characteristics and rate characteristics are improved (Example 3,
4, 7, 8). In addition, even if vacuum degassing was performed under the condition of 1 × 10 ⁶ Pa, almost no effect was observed. Then 1 × 1
When vacuum defoaming was performed under the condition of 0 ^-1 Pa, the solvent used was volatilized, the viscosity of the paint increased, and the surface of the formed strong plate deteriorated, resulting in a decrease in rate characteristics (Comparative Examples 3 and 4). .

Further, by adding graphite carbon simultaneously with the active material, it is possible to suppress strong shearing of the graphite carbon, so that it is possible to prevent the graphite carbon from being crushed, and to further improve the current collection efficiency, thereby improving the cycle characteristics. And the rate characteristics can be improved (Examples 5 and 6).

As described above, by using carbon black and graphite carbon as the conductive material, a lithium ion secondary battery having excellent cycle life and rate characteristics can be realized. That is, a lithium ion secondary battery with good conductivity can be realized.

[0061]

As is apparent from the above description, the present invention can provide a lithium ion secondary battery having good conductivity and a method for manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a lithium ion secondary battery.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 positive electrode side current collector 2 positive electrode layer 3 separator 4 negative electrode layer 5 negative electrode side current collector

 ────────────────────────────────────────────────── ─── Continued on front page F term (reference) 5H029 AJ02 AJ05 AK03 AK05 AL06 AL07 AL08 AM02 AM03 AM04 AM05 AM07 BJ12 CJ02 CJ28 DJ07 DJ08 DJ16 DJ18 EJ04 HJ15 5H050 AA02 AA07 BA17 CA07 CA08 CA09 CA11 CB07 DA09 DA02 DA09 EA09 EA10 FA17 FA20 GA27 HA15

Claims (5)

[Claims] 1. A positive electrode side current collector, a positive electrode layer having a positive electrode side active material containing at least lithium, a separator containing an electrolytic solution, a negative electrode layer having a negative electrode side active material, and a negative electrode side current collector. A lithium ion secondary battery comprising: the positive electrode layer and / or the negative electrode layer having at least one or more types of carbon black and at least one or more types of graphite carbon. 2. A positive electrode side current collector, a positive electrode layer having a positive electrode side active material containing at least lithium, a separator containing an electrolytic solution, a negative electrode layer having a negative electrode side active material, and a negative electrode side current collector. A method for manufacturing a lithium ion secondary battery, comprising: adding at least one or more types of carbon black to a predetermined solvent to disperse the carbon black in the positive electrode layer; Graphite carbon of more than one kind is added so that the positive electrode side active material and the graphite carbon are dispersed, and the carbon black, the positive electrode side active material and the solvent containing the graphite carbon are formed into a sheet, A method for producing a lithium ion secondary battery produced by drying a battery. 3. A positive electrode side current collector, a positive electrode layer having a positive electrode side active material containing at least lithium, a separator containing an electrolytic solution, a negative electrode layer having a negative electrode side active material, and a negative electrode side current collector. A method for manufacturing a lithium ion secondary battery, comprising: adding at least one or more types of carbon black to a predetermined solvent to disperse the carbon black in the negative electrode layer; Graphite carbon of more than one kind is added so that the negative electrode side active material and the graphite carbon are dispersed, and the solvent containing the carbon black, the negative electrode side active material and the graphite carbon is formed into a sheet, A method for producing a lithium ion secondary battery produced by drying a battery. 4. A positive electrode side current collector, a positive electrode layer having a positive electrode side active material containing at least lithium, a separator containing an electrolytic solution, a negative electrode layer having a negative electrode side active material, and a negative electrode side current collector. A method for manufacturing a lithium ion secondary battery comprising: the positive electrode layer, adding at least one or more conductive agents and the positive electrode active material to a predetermined solvent, the conductive agent and the positive electrode active material The solvent containing 10 Pa or more and 1 × 10
A method for producing a lithium ion secondary battery, wherein the conductive agent is dispersed by stirring in a vacuum of ⁵ Pa or less, the solvent in which the conductive agent is dispersed is formed into a sheet, and the sheet is dried. 5. A positive electrode current collector, a positive electrode layer having a positive electrode active material containing at least lithium, a separator containing an electrolytic solution, a negative electrode layer having a negative electrode active material, and a negative electrode current collector. A method for manufacturing a lithium ion secondary battery, comprising: adding a negative electrode layer, at least one or more conductive agent and the negative electrode side active material to a predetermined solvent, and forming the conductive agent and the negative electrode side active material. The solvent containing 10 Pa or more and 1 × 10
^A method for producing a lithium ion secondary battery, wherein the conductive agent is dispersed by stirring in a vacuum of ⁵ Pa or less, the solvent in which the conductive agent is dispersed is formed into a sheet, and the sheet is dried.