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Negative electrode for lithium ion secondary battery, and lithium ion secondary battery

A secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, lithium batteries, etc., can solve problems such as deformation, cycle characteristics degradation, and negative electrode active material layer detachment, and achieve high energy density, high capacity, and cycle Excellent effect

Inactive Publication Date: 2012-07-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If the negative electrodes disclosed in Patent Document 1 and Patent Document 2 are used, the silicon-based active material particles expand significantly during charging to generate internal stress, thereby detaching the negative electrode active material layer from the negative electrode current collector or deformation of the negative electrode, etc. Thus the cycle characteristics can be reduced

Method used

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  • Negative electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Negative electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Negative electrode for lithium ion secondary battery, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] (a) Preparation of positive electrode

[0100] 85 mass parts of positive electrode active material (LiNi 0.80 C 0.15 Al 0.05 o 2 ), 10 parts by mass of graphite powder, and 5 parts by mass of polyvinylidene fluoride powder mixed with an appropriate amount of N-methyl-2-pyrrolidone to prepare a positive electrode mixture slurry. The obtained positive electrode mixture slurry was coated on both sides of an aluminum foil (positive electrode current collector) having a thickness of 15 μm, and the obtained coating film was dried and rolled to produce a positive electrode with a thickness of 130 μm. The obtained positive electrode was cut into a width capable of being inserted into a battery case of a 14400 cylindrical battery (about 14 mm in diameter and about 40 mm in height).

[0101] (b) Preparation of negative electrode

[0102] (b-1) Preparation of negative electrode current collector

[0103] A nip is formed by pressing two forged steel rolls arranged in a zigzag...

Embodiment 2

[0126] (c) In the formation of the resin layer, except that polyacrylic acid (number average molecular weight: 200,000) was used instead of polyimide, three cylindrical lithium ion secondary batteries were produced in the same manner as in Example 1. single battery.

Embodiment 3

[0128] In the formation of (c) resin layer, VDF-HFP copolymer (2) (HFP content: 8mol%, swelling degree: 160%, number average molecular weight: 500,000) was used instead of VDF-HFP copolymer (1) , except that, in the same manner as in Example 1, three single cells of cylindrical lithium ion secondary batteries were produced.

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Abstract

A negative electrode for a lithium ion secondary battery, which comprises a negative electrode current collector that has multiple protruding parts formed on the surface thereof and multiple particulate materials that are supported on the protruding parts and comprise an alloy active material capable of absorbing and releasing lithium ions, wherein each of the particulate materials has a resin layer formed on the surface thereof, and wherein the resin layer comprises at least one first resin component which is selected from polyimide and polyacrylic acid and a second resin component which comprises a copolymer containing a vinylidene fluoride unit and a hexafluoropropylene unit; and a lithium ion secondary battery equipped with the negative electrode.

Description

technical field [0001] The present invention relates to a negative electrode for a lithium ion secondary battery and a lithium ion secondary battery. More specifically, the present invention relates to improvement of a negative electrode of a lithium ion secondary battery using an alloy-based active material as a negative electrode active material. Background technique [0002] Lithium-ion secondary batteries using alloy-based active materials as negative electrode active materials (hereinafter referred to as "alloy-based secondary batteries") have higher capacity and energy than conventional lithium-ion secondary batteries using graphite as negative electrode active materials. density. Therefore, alloy-based secondary batteries are expected not only as power sources for electronic devices but also as main power sources or auxiliary power sources for transportation equipment, work equipment, and the like. As alloy-based active materials, silicon-based active materials such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/36H01M4/38H01M4/70H01M10/052H01M10/0566
CPCH01M4/36Y02E60/12H01M4/134H01M4/70H01M4/38H01M10/0566H01M10/052Y02T10/7011Y02E60/122H01M4/386H01M4/622H01M4/387Y02E60/10
Inventor 平冈树山本泰右柏木克巨宇贺治正弥
Owner PANASONIC CORP