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Slurry composition for negative electrode of lithium ion secondary battery, 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 the problems of cycle characteristics reduction, deterioration, large expansion and shrinkage, etc., and achieve excellent cycle characteristics, excellent cycle characteristics, coating Excellent fabric effect

Active Publication Date: 2018-09-14
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, on the one hand, silicon-based negative electrode active materials have a high theoretical capacity and can increase the battery capacity of lithium-ion secondary batteries, but on the other hand, large expansion and contraction occur with charge and discharge.
Therefore, in the negative electrode that has used silicon-based negative electrode active material, there is the deterioration that can cause silicon-based negative electrode active material itself (that is, the deterioration of silicon-based negative electrode active material) miniaturization caused by structural damage), and / or the occurrence of plate structure damage that leads to the destruction of the conductive path in the electrode
That is, in a lithium-ion secondary battery provided with a negative electrode using a silicon-based negative-electrode active material, there is a problem that cycle characteristics are degraded due to large expansion and contraction of the silicon-based negative-electrode active material.

Method used

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  • Slurry composition for negative electrode of lithium ion secondary battery, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

Examples

Experimental program
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Effect test

preparation example Construction

[0075] [Preparation method of polyacrylic acid (1)]

[0076]The above-mentioned polyacrylic acid having a viscosity property is not particularly limited, and examples thereof include crosslinked polyacrylic acid obtained by copolymerizing acrylic acid or a salt thereof, a crosslinkable monomer, and other polymerizable monomers optionally contained. In addition, in crosslinked polyacrylic acid, it is preferable that 70 mass % or more of the monomer total amount used for producing a copolymer is acrylic acid or its salt. In addition, the amount of the crosslinkable monomer used in the production of the crosslinkable polyacrylic acid is preferably 2.0 parts by mass or less, more preferably 1.0 parts by mass relative to 100 parts by mass of the total amount of monomers other than the crosslinkable monomer. servings or less.

[0077] [[Acrylic acid or its salts]]

[0078] Here, examples of acrylic acid or its salt include acrylic acid, alkali metal salts such as sodium salts and ...

Embodiment 1

[0240]

[0241] Artificial graphite (manufactured by Hitachi Chemical, theoretical capacity: 360mAh / g) as a carbon-based negative electrode active material and SiO as a silicon-based negative electrode active material were prepared. x (manufactured by Shin-Etsu Chemical, theoretical capacity: 2300mAh / g).

[0242]

[0243] A 1% by mass aqueous solution of crosslinked sodium polyacrylate (manufactured by Toagosei Co., Ltd., RHEOGIC 260H) was prepared.

[0244]

[0245] MAC800LC (manufactured by NIPPON PAPER Chemicals, sodium salt of carboxymethylcellulose, viscosity of 1% by mass aqueous solution: 6.7 to 9.2 Pa·s) was prepared as a carboxymethylcellulose salt.

[0246]

[0247] Add 62 parts of styrene as an aromatic vinyl monomer, 35 parts of 1,3-butadiene as an aliphatic conjugated diene monomer, and coat 2 parts of acrylic acid, 1 part of 2-hydroxyethyl acrylate (2-hydroxyethyl acrylate) as a hydroxyl-containing monomer, 0.3 parts of tert-dodecyl mercaptan as a molecu...

Embodiment 2

[0262] In addition to making the blending amount of artificial graphite as a carbon-based negative electrode active material 75 parts, SiO as a silicon-based negative electrode active material x Except the compounding quantity of 25 parts, it carried out similarly to Example 1, and prepared the slurry composition for lithium ion secondary battery negative electrodes, a negative electrode, a positive electrode, and a lithium ion secondary battery. Then, it evaluated similarly to Example 1. The results are shown in Table 1.

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Abstract

An object of the present invention is to provide a slurry composition for a negative electrode of a lithium ion secondary battery that can increase battery capacity while suppressing expansion and shrinkage of a silicon-based negative electrode active material accompanying charge and discharge, and is excellent in coatability. The slurry composition for lithium ion secondary battery negative electrode of the present invention comprises: negative electrode active material, polyacrylic acid and water, negative electrode active material contains silicon negative electrode active material in the ratio of 5~40 mass %, 1 mass % aqueous solution of polyacrylic acid The ratio of the viscosity to the viscosity of the 0.5% by mass aqueous solution is 2.0 or more.

Description

technical field [0001] The present invention relates to a slurry composition for a negative electrode of a lithium ion secondary battery, a negative electrode for a lithium ion secondary battery, and a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary batteries are small, lightweight, have high energy density, and have characteristics such as being capable of repeated charging and discharging, and have been used in a wide range of applications. For this reason, in recent years, studies have been made on improvement of battery components such as electrodes for the purpose of achieving further performance enhancement of lithium ion secondary batteries. [0003] In particular, studies have been conducted on improving the battery capacity of lithium ion secondary batteries by employing silicon-based negative electrode active materials as negative electrode active materials used in negative electrodes of lithium ion secondary batteries. [0004] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/131H01M4/1391H01M4/1395H01M4/38H01M4/48H01M4/62H01M10/052H01M10/0566
CPCH01M4/0404H01M4/131H01M4/134H01M4/1391H01M4/1395H01M4/386H01M4/485H01M4/622H01M10/052Y02E60/10H01M10/0525
Inventor 涉谷政宪园部健矢金田拓也
Owner ZEON CORP