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Positive electrode current collector laminate for lithium secondary battery

A technology of positive electrode collector and collector layer, which is applied in the direction of electrode carrier/collector, battery electrode, lithium battery, etc., and can solve problems such as cycle characteristics and battery capacity reduction

Inactive Publication Date: 2012-08-22
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In a lithium secondary battery with such a configuration, due to the action of the electrolyte such as lithium salt contained in the electrolytic solution, the positive electrode current collector is oxidized and corroded by the anodic, and there is a problem that cycle characteristics and battery capacity are reduced.

Method used

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  • Positive electrode current collector laminate for lithium secondary battery
  • Positive electrode current collector laminate for lithium secondary battery
  • Positive electrode current collector laminate for lithium secondary battery

Examples

Experimental program
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Effect test

preparation example Construction

[0055] What is necessary is just to mix each component by the usual mixing method used for the coating composition using resin about preparation of a coating composition.

[0056] The method for forming the coating film may be a conventionally known method. Apply to the substrate by, for example, roller coating, brush coating, dip coating, spray coating, gravure printing, coil coating, curtain coating, etc., and allow to dry naturally at ambient temperature or heat dried to form a coating film.

[0057] When the composition for forming a protective layer is in the form of a composition for molding, the fluororesin (b1), conductive filler (b2), and other components (b3) and solvent (b4) if necessary, are slurry by the usual method can be converted.

[0058] The conductive protective layer (B) obtained in this way can control the volume resistivity in the range of 0.001Ω·cm~50Ω·cm, and can provide a volume resistivity of 0.001Ω·cm~10Ω·cm, and further 1Ω·cm following a highly ...

Embodiment 1

[0093] A composition having the following composition was prepared using a planetary rolling mill, and coated on an aluminum foil (thickness: 15 μm) with a bar coater to obtain a laminate in which a conductive protective layer (thickness: 5.8 μm) was formed on the aluminum foil.

[0094] (b1) 100 parts by mass of fluorine-containing resin

[0095] (b2) Conductive filler 100 parts by mass

[0096] (b4) 800 parts by mass of organic solvent

[0097] The ingredients are as follows.

[0098] (b1-1) Fluorine-containing resin:

[0099] Composition: PVdF

[0100] Weight average molecular weight (Mw): 110,000

[0101] (b2-1) Conductive filler:

[0102] A kind: Conductive graphite (artificial graphite HAG made by Nippon Black Lead Co., Ltd.)

[0103] Average particle size: 5μm

[0104] Volume resistivity: 0.05Ω·cm

[0105] (b4-1) Organic solvent: NMP (N-methylpyrrolidone)

[0106] In addition, the volume resistivity of the obtained laminate was examined. The results are listed...

Embodiment 2

[0108] In Example 1, except that the blending amount of the conductive filler was changed to 150 parts by mass, a paint was prepared in the same manner as in Example 1, and a laminate in which a conductive protective layer (thickness: 6 μm) was formed on an aluminum foil was obtained. body.

[0109] In addition, the volume resistivity of the obtained laminate was examined. The results are listed in Table 1.

[0110] The level of conductivity (0.09 Ω·cm) obtained in this example is in the range of what is called a high-conductivity material, and it is possible to achieve both good processability. It should be noted that when a voltage is applied to this laminate, heat generation is observed, so this can be used as a heater or an electrode.

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Abstract

Disclosed are: a positive electrode current collector laminate which can protect a positive electrode current collector from corrosion without deteriorating the battery properties thereof even when used under high-voltages; and a lithium secondary battery. Specifically disclosed are: a positive electrode current collector laminate comprising a positive electrode current collector (A) and an electrically conductive protective layer (B) provided on the positive electrode current collector (A) and comprising a fluororesin (b1) and an electrically conductive filler (b2); and a lithium secondary battery equipped with the positive electrode current collector laminate.

Description

technical field [0001] The present invention relates to a positive electrode current collector laminate, a positive electrode laminate, and a lithium secondary battery of a lithium secondary battery. Background technique [0002] The lithium secondary battery has a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode is provided with a positive electrode mixture layer on a positive electrode collector such as aluminum foil, and the positive electrode mixture layer contains positive active materials such as lithium-containing composite oxides; The negative electrode collector is provided with a negative electrode mixture layer, and the negative electrode mixture layer contains negative electrode active materials such as carbonaceous materials; the above-mentioned non-aqueous electrolytic solution contains electrolyte salts such as lithium salts and organic solvents. [0003] In such a lithium secondary battery, the positive electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13H01M10/05
CPCH01M4/663H01M4/667H01M4/668H01M10/052Y02E60/10H01M4/13H01M4/66
Inventor 高明天坂田英郎有马博之佐薙知世
Owner DAIKIN IND LTD
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