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Binder for lithium secondary battery, negative electrode for lithium secondary battery, lithium secondary battery, binder precursor solution for lithium secondary battery, and method for manufacturing negative electrode for lithium secondary battery

A lithium secondary battery and precursor solution technology, applied in battery electrodes, lithium storage batteries, adhesives, etc., can solve the problem of reduced charge-discharge cycle characteristics of lithium secondary batteries, large volume changes of negative electrode active materials, negative electrode active materials and negative electrode active materials. Layer detachment and other problems, to achieve the effect of excellent charge-discharge cycle characteristics

Inactive Publication Date: 2012-07-04
SANYO ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in a negative electrode in which an alloy material containing elements such as Al, Sn, and Si and alloyed with lithium is used as the negative electrode active material, the volume change of the negative electrode active material is large during charge and discharge, that is, when lithium is stored and released.
Therefore, micronization of the negative electrode active material or detachment of the negative electrode active material layer from the current collector easily occurs.
If the negative electrode active material is micronized or the negative electrode active material layer is detached from the negative electrode current collector, there will be a problem that the current collection property in the negative electrode will decrease, and the charge-discharge cycle characteristics of the lithium secondary battery will decrease.

Method used

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  • Binder for lithium secondary battery, negative electrode for lithium secondary battery, lithium secondary battery, binder precursor solution for lithium secondary battery, and method for manufacturing negative electrode for lithium secondary battery
  • Binder for lithium secondary battery, negative electrode for lithium secondary battery, lithium secondary battery, binder precursor solution for lithium secondary battery, and method for manufacturing negative electrode for lithium secondary battery
  • Binder for lithium secondary battery, negative electrode for lithium secondary battery, lithium secondary battery, binder precursor solution for lithium secondary battery, and method for manufacturing negative electrode for lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] In Example 1, a battery A1 having substantially the same configuration as the lithium secondary battery 1 of the above-described embodiment was produced in the following manner.

[0078] [Production of Negative Electrode]

[0079] (1) Preparation of negative electrode active material

[0080] First, polysilicon particles are introduced into the fluidized bed with an internal temperature of 800°C, and at the same time, monosilane (SiH 4 ), thereby producing granular polycrystalline silicon, and then pulverizing the granular polycrystalline silicon using a jet mill, and then classifying in a classifier to produce polycrystalline silicon powder (negative electrode active material). The median diameter of the polycrystalline silicon powder was 10 μm. The crystallite size of the polycrystalline silicon powder is 44nm.

[0081] In addition, the median diameter is a 50% cumulative volume particle diameter in particle size distribution measurement by a laser diffraction meth...

Embodiment 2

[0106] In the preparation of the binder precursor solution, (3,3',4,4'-benzophenone tetracarboxylic dianhydride):(m-phenylenediamine):(3-aminopropyltriethoxy A battery A2 was fabricated in the same manner as in Example 1 above, except that the molar ratio was 100:100:5.

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Abstract

Provided is a binder capable of realizing a lithium secondary battery that includes a negative electrode including a negative-electrode active material layer containing at least one of silicon and a silicon alloy as a negative-electrode active material and also containing a binder and has an excellent charge-discharge cycle characteristic. The binder for the lithium secondary battery contains a polyimide resin that is formed by imidizing either a tetracarboxylic acid or a tetracarboxylic anhydride and a diamine, the polyimide resin having a hydrolyzable silyl group.

Description

technical field [0001] The invention relates to a method for manufacturing a binder for lithium secondary batteries, a negative electrode for lithium secondary batteries, a lithium secondary battery, a binder precursor solution for lithium secondary batteries, and a negative electrode for lithium secondary batteries. In particular, the present invention relates to a binder for a lithium secondary battery containing at least one of silicon and a silicon alloy as a negative electrode active material, a negative electrode for a lithium secondary battery including the binder, a lithium secondary battery provided with the negative electrode, The precursor solution of the said binder and the manufacturing method of the said negative electrode for lithium secondary batteries. Background technique [0002] In recent years, there has been an increasing demand for higher energy density of lithium secondary batteries. Along with this, research on negative electrode active materials th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J179/08H01M4/62H01M4/134H01M10/052H01M4/38
CPCH01B1/122Y02E60/122H01M4/622C08L79/08H01M4/1395C08G73/1017C08G73/1067Y02E60/10
Inventor 福井厚史砂野泰三神野丸男米田善纪
Owner SANYO ELECTRIC CO LTD