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Binder composition for electrode of nonaqueous electrolyte battery, and electrode mixture, electrode and battery using same

A non-aqueous electrolyte and battery electrode technology, applied in non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, battery electrodes, etc., can solve problems such as smoke, insufficient adhesion, and increased risk

Inactive Publication Date: 2008-01-30
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Japanese Patent Application Laid-Open No. 11-329443 lists a mixture of vinylidene fluoride-based polymers and cellulose-based polymers without functional groups, but its adhesiveness is insufficient, and its safety has never been considered.
[0005] However, the market demand for miniaturization, light weight, and increased battery life has put forward a demand for further increase in capacity of lithium-ion batteries. Compared with the past, the battery is filled with electrode materials to increase capacity, but on the other hand , There is also the problem of increased danger. When a short circuit occurs inside the battery, an excessive current will flow locally, causing the temperature of the battery to rise sharply, causing the battery to rupture, smoke, fire and other dangerous states

Method used

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  • Binder composition for electrode of nonaqueous electrolyte battery, and electrode mixture, electrode and battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (preparation of positive electrode)

[0036] Add N-methyl-2-pyrrolidone (NMP) to 94 parts by weight of lithium cobaltate ("Cellshid C-5", manufactured by Nippon Chemical Industry Co., Ltd.), 3 parts by weight of vinylidene fluoride polymer C, and 3 parts by weight of carbon black. 43 parts by weight, mixed to prepare a mixture for the positive electrode. The obtained mixture is evenly coated on an aluminum foil with a thickness of 10 μm, so that the thickness of the coating film after drying is 100 μm, and dried at 130° C. for 25 minutes to obtain a positive plate structure (active material amount: 291 g / m 2 ).

[0037] (preparation of negative electrode)

[0038] For 11 parts by weight of vinylidene fluoride polymer A containing functional groups, 1 part by weight of ethylene-vinyl alcohol copolymer (manufactured by EVOH, クレハ company, "Eval EP-G156B", the molar content of ethylene is 47%), add Composition A of the negative electrode mixture of the present invention ...

Embodiment 2

[0051] When preparing the negative electrode, polyacrylic acid (PAA) ("AQUPEC HV-501", manufactured by Sumitomo Seika Chemical Co., Ltd.) was used instead of EVOH. In addition, the same operation as Example 1 was carried out to obtain negative electrode structure B, namely battery B .

[0052] The peel strength of the negative electrode structure B was 1.0 gf / mm, the charging capacity of the battery B was 135 mAh, and the maximum temperature increase in the nail penetration test was 3.5°C.

Embodiment 3

[0054] When preparing the negative electrode, the vinylidene fluoride polymer B containing the functional group is used instead of the vinylidene fluoride polymer A containing the functional group. In addition, the same operation as in Example 1 is carried out to obtain the negative electrode structure C, that is, the battery c.

[0055] The peel strength of the negative electrode structure C was 4.3 gf / mm, the charging capacity of the battery C was 130 mAh, and the maximum temperature increase in the nail penetration test was 3°C.

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Abstract

A composition comprising at least a functional group-containing vinylidene fluoride polymer and a polar polymer having a hydroxyl group and / or a carbonyl group in the molecule is used as a binder for an electrode (a positive or negative electrode) active material. Consequently, a nonaqueous electrolyte battery can have improved performance stability and improved safety at the time of internal short-circuiting while maintaining a necessary large capacity.

Description

technical field [0001] The invention relates to an electrode binder for preparing a nonaqueous electrolyte battery, especially a lithium ion battery, an electrode mixture using the binder, an electrode and a nonaqueous electrolyte battery using the electrode. Background technique [0002] With the rapid development of electronic technology in recent years, all kinds of equipment are constantly developing in the direction of miniaturization and light weight. With the development of electronic equipment in the direction of miniaturization and weight reduction, the miniaturization and weight reduction of batteries as its power sources are also highly desired. Non-aqueous secondary batteries using lithium have been used mainly as power sources for small household electronic devices such as mobile phones, personal computers, and video recorders as batteries that can obtain greater energy with a smaller volume and lighter weight. [0003] The active material and conductive agent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/02H01M10/40H01M4/13H01M4/133H01M10/05H01M10/052H01M10/0525H01M10/0566
CPCY02E60/12H01M4/623H01M4/621Y02E60/10H01M4/62
Inventor 佐久间充康阿彦信男川上智昭葛尾巧
Owner KUREHA KAGAKU KOGYO KK
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