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Binder composition for secondary battery negative electrode, secondary battery negative electrode, and secondary battery

一种二次电池、粘结剂的技术，应用在二次电池、电池电极、电极集电体涂层等方向，能够解决未必能满足充放电循环特性、难以得到高充电容量等问题，达到弹性模量与柔软性的均衡性良好、控制金属密合性、粘结性优异的效果

Inactive Publication Date: 2018-08-03
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, alloy-based active materials generally have larger volume expansion than graphite-based active materials. For example, it is known that the well-known silicon (Si) active material that is an alloy-based active material causes a volume change of about 400% during charging and discharging.
Due to such a volume change, the active material is more likely to be peeled off from the electrode. Therefore, it is difficult to obtain a stable high charge capacity for a binder containing a conventional polyvinyl alcohol-based resin-containing emulsion used in a graphite-based active material, and it is also difficult to obtain a stable high charge capacity. May not be able to meet the cycle characteristics of charge and discharge

Method used

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  • Binder composition for secondary battery negative electrode, secondary battery negative electrode, and secondary battery
  • Binder composition for secondary battery negative electrode, secondary battery negative electrode, and secondary battery
  • Binder composition for secondary battery negative electrode, secondary battery negative electrode, and secondary battery

Examples

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Embodiment

[0197] Hereinafter, although an Example is given and this invention is demonstrated further concretely, this invention is not limited to the following Example unless the summary is exceeded. In addition, "part" or "%" in an example means a basis of weight unless it mentions otherwise.

[0198] Analytical method

[0199] The PVA-based resins produced in the following Examples and Comparative Examples were analyzed by the following methods.

[0200] (1) Saponification degree (mol%)

[0201] The analysis was carried out by the consumption of base required for the hydrolysis of residual vinyl acetate and 3,4-diacetoxy-1-butene.

[0202] (2) Viscosity average degree of polymerization

[0203] Measured in accordance with JIS K 6726.

[0204] (3) Content of side chain 1,2-diol structural unit (modified amount) (mol%)

[0205] Using AVANCEIIIHD 400 manufactured by BRUKER, in 1 It was measured by H-NMR (400 MHz, proton NMR, solvent: heavy aqueous solution, temperature: 50° C.), and...

manufacture example 1

[0220] [Manufacturing example 1: Manufacture of binder solution]

[0221] The basic emulsion prepared in the aforementioned polymerization example 1 was classified, and purified water for dilution was added, and a modified PVA-based resin (saponification degree: 99.1 mol%, viscosity-average degree of polymerization: 1200, content rate of 1,2-diol structural unit represented by the above structural formula (1a): 6 mol %) in a 10% aqueous solution to prepare a 10% binder solution . At this time, the weight ratio of polymer particles composed of (1) a mixture of PVA-based resin and (2) butyl acrylate (BA) and styrene (St) in the solid content of the binder is (1) / ( 2)=90 / 10 mode is prepared.

manufacture example 2

[0222] [Manufacturing example 2: Manufacture of binder solution]

[0223] The weight ratio of polymer particles composed of (1) PVA-based resin and (2) butyl acrylate (BA) and styrene (St) in the solid content of the binder is (1) / (2)= A binder solution was prepared in the same manner as in Production Example 1 except that it was prepared in the manner of 80 / 20.

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Abstract

The present invention relates to a binder composition for a secondary battery negative electrode, said binder composition making it possible to form a stable negative electrode active material layer that can follow changes in the volume of a negative electrode and thus to produce a secondary battery with which high charge / discharge capacity can be obtained and charge / discharge cycling characteristics can be improved. Provided is a binder composition for producing a secondary battery negative electrode, said composition containing, as an active material, an element that can form an alloy with lithium, and being characterized by including an emulsion obtained by dispersing polymer particles, which are derived from an ethylenic unsaturated monomer, in a polyvinyl alcohol resin aqueous solution, wherein the ratio of the polyvinyl alcohol resin / polymer particles is 60 / 40 to 99 / 1 by weight ratio of the resin solid content.

Description

technical field [0001] The invention relates to a binder composition for a negative electrode of a secondary battery, a negative electrode of a secondary battery and a secondary battery. Specifically, it relates to a binder composition used together with a negative electrode active material to constitute a negative electrode of a secondary battery, a secondary battery negative electrode containing the binder composition, and a battery having the secondary battery negative electrode. secondary battery. Background technique [0002] A secondary battery generally has the following configuration: a positive electrode in which a positive electrode active material layer containing a positive electrode active material is formed on both sides of a positive electrode current collector, and a negative electrode in which a negative electrode active material layer containing a negative electrode active material is formed on both sides of a negative electrode current collector. The laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134C08L29/04H01M4/02H01M4/13H01M4/38H01M4/48H01M4/62
CPCC08L29/04H01M4/134C09D129/04H01M4/1395H01M4/405H01M4/0404H01M4/622H01M2004/021Y02E60/10C08L25/14C08K3/01C08L1/286H01M4/13H01M10/052H01M4/382H01M10/0525H01M2004/027
Inventor 矢野友健渋谷光夫
Owner MITSUBISHI CHEM CORP
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