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Binder for lithium cell

A technology for binders and lithium batteries, applied in the field of binders and compositions for electrode production, can solve the problems of reduced charge and discharge capacity, large volume change, electrode damage, etc.

Inactive Publication Date: 2016-12-14
FUJIFILM WAKO PURE CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when silicon is used as an active material, it is known that a large volume change occurs during charge and discharge (up to 3 times or more)
And, due to this volume change, the destruction of the electrode structure is caused at the time of charging and discharging, resulting in the destruction of the electrode
As a result, there are problems such as reduction in charge and discharge capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0306] Synthesis of Synthesis Example 1 Crosslinked Copolymer P-01

[0307] 10 g of propylene glycol monomethyl ether acetate (manufactured by Wako Pure Chemical Industries, Ltd.) was added to a 200 ml round-bottomed flask equipped with a stirring device, a condenser, a thermometer, and a nitrogen inlet tube, and heated to an internal temperature of 90° C. under a nitrogen stream. Next, 9.2 g of acrylic acid (0.13 mol, manufactured by Wako Pure Chemical Industries, Ltd.), 0.78 g of 2-hydroxyethyl acrylate (6.7 mmol, manufactured by Tokyo Chemical Industry Co., Ltd.), 0.03 g of diethylene glycol diallyl ether ( A solution obtained by mixing 0.18 mmol (manufactured by Wako Pure Chemical Industries, Ltd.) and 13 g of propylene glycol monomethyl ether acetate was dropped into a round-bottomed flask over 2 hours. Thereafter, the resulting solution was reacted at 90° C. for 2 hours. After the reaction, it was cooled to room temperature, and 30 g of propylene glycol monomethyl eth...

Synthetic example 2

[0308] Synthesis of Synthesis Example 2 Crosslinked Copolymer P-02

[0309] Except that 0.68 g of dimethylacrylamide (6.8 mmol, manufactured by Wako Pure Chemical Industries, Ltd.) was used instead of 0.78 g of 2-hydroxyethyl acrylate, polymerization was carried out in the same manner as in Synthesis Example 1 to obtain cross linked copolymers. This was made crosslinked copolymer P-02 (acrylic acid / dimethylacrylamide=95 / 5).

Synthetic example 3

[0310] Synthesis of Synthesis Example 3 Crosslinked Copolymer P-03

[0311] Instead of 9.2 g of acrylic acid and 0.78 g of 2-hydroxyethyl acrylate, 7.5 g of acrylic acid (0.10 mol) and 2.5 g of methoxypolyethylene glycol methacrylate (5.4 mmol, manufactured by Shinnakamura Chemical Co., Ltd.) were used. Otherwise, the polymerization reaction was carried out in the same manner as in Synthesis Example 1 to obtain a crosslinked copolymer. This was used as crosslinked copolymer P-03 (acrylic acid / methoxypolyethylene glycol methacrylate=95 / 5).

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Abstract

This invention addresses the problem of providing an electrode with which excellent charge / discharge capacity can be obtained even when an active material containing silicon is used. The present invention pertains to: a binder for a lithium cell comprising a polymer that has, as constituent elements, an acrylic acid-derived monomer unit and one or two monomer units derived from compounds represented by general formulae (I), (II), or (III), the binder being crosslinked by a crosslinking agent selected from compounds indicated in general formulae [1]-[13] and the monomer indicated in general formula [14]; a composition for producing an electrode of a lithium cell, the composition containing 1) a silicon-containing active material, 2) an electroconductive aid, and 3) the binder for a cell; and an electrode for a lithium cell having 1) a silicon-containing active material, 2) a conductive aid, 3) the binder for a cell, and 4) a collector.

Description

technical field [0001] The invention relates to a binder, a composition for making an electrode and an electrode used in a lithium battery. Background technique [0002] Lithium-ion batteries are used as secondary batteries as power sources for various portable devices such as mobile phones. In recent years, research and development of large-scale batteries assumed to be used in automobiles and the like has been actively carried out. Therefore, it is essential to further increase the energy density of current lithium-ion batteries. Therefore, the use of high-capacity silicon materials instead of carbon-based materials has attracted attention as an active material. The reason why silicon has a high capacity is considered to be that silicon can electrochemically alloy with lithium at room temperature, thereby bringing about a higher capacity than the case of using carbon. [0003] However, when silicon is used as an active material, it is known that a large volume change (in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M4/36H01M4/38H01M4/587
CPCH01M4/134H01M4/36H01M4/38H01M4/587H01M4/62C08F220/06H01M4/622Y02E60/10C08F220/1806C08F220/286C08F216/125H01M4/386H01M4/624C08F220/56H01M10/0525C08F220/20C08F220/54C08F220/24
Inventor 驹场慎一山际清史青木翔子冈本训明清洲高广森康嘉松浦隆敏佐藤道彦
Owner FUJIFILM WAKO PURE CHEM CORP
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