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Negative electrode for nonaqueous electrolyte secondary battery, manufacturing method thereof, and lithium ion secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve problems such as insufficient maintenance of cycle characteristics, dry and high temperature of electrodes, etc., and achieve high initial charge and discharge efficiency and low volume expansion Excellent efficiency and cycle characteristics

Inactive Publication Date: 2018-06-08
SHIN ETSU CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As a solution to these problems, Patent Document 17 discloses a method of adjusting the ratio of amide / imide to suppress the reduction in primary efficiency from polyimide while maintaining cycle characteristics (JP-A-2011-60676: Patent Document 17 ), but there are problems such as high temperature is required to dry the electrode, and the maintenance of long-term cycle characteristics is not sufficient.

Method used

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  • Negative electrode for nonaqueous electrolyte secondary battery, manufacturing method thereof, and lithium ion secondary battery
  • Negative electrode for nonaqueous electrolyte secondary battery, manufacturing method thereof, and lithium ion secondary battery
  • Negative electrode for nonaqueous electrolyte secondary battery, manufacturing method thereof, and lithium ion secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0110]

[0111] The average particle size is 5μm, the BET specific surface area is 3.5m 2 / g silicon oxide SiO x (x=1.01) 100g was loaded into a batch heating furnace. Use an oil rotary vacuum pump to reduce the pressure in the furnace, and at the same time raise the temperature in the furnace to 1,000°C. After reaching 1,000°C, let the CH 4 The gas was flowed in, and the carbon coating treatment was performed for 5 hours. In addition, the degree of reduced pressure at this time was 800 Pa. After cooling down, 97.5g of SiO was obtained 2 The Si-dispersed particles are carbon-coated black particles. The obtained black particles have an average particle size of 5.2 μm and a BET specific surface area of ​​6.5 m 2 / g, electroconductive particles with a carbon coating amount of 5.1% by mass relative to the black particles.

[0112]

[0113] While flowing nitrogen into a 2L 4-neck flask, 192 g (1.0 mol) of trimellitic anhydride as a polycarboxylic acid anhydride, 132 g (0....

Embodiment 2

[0124] Among 88 parts by mass of conductive particles obtained in Example 1, 0.25 parts by mass of 1.0 parts by mass of 3 μm artificial graphite powder and 0.25 parts by mass of AMC361 (registered trademark) of Ube Industries, Ltd. as fine carbon fibers and 0.75 parts by mass of acetylene black and 10 mass parts of the polyamide-imide resin solution of embodiment 1 are mixed, and then add NMP20 mass parts and make slurry, add the dibutyl glycol solution (bonding agent) as ethylene glycol ether in this slurry 0.2 parts by mass of weight), made into slurry. The slurry is coated on a copper foil with a thickness of 12 μm, and the gap during coating is changed, and it is coated with several thicknesses. After drying at 80° C. for 1 hour, the electrode is pressed and formed by rolling, and the electrode is formed at 200 After vacuum drying at ℃ for 2 hours, punched into 2cm 2 , made into a negative electrode. The electrolyte solution permeability of this negative electrode was co...

Embodiment 3

[0126] Among 88 parts by mass of conductive particles obtained in Example 1, 0.25 parts by mass of 1.0 parts by mass of 3 μm artificial graphite powder and 0.25 parts by mass of AMC361 (registered trademark) of Ube Industries, Ltd. as fine carbon fibers and 0.75 parts by mass of acetylene black and 10 mass parts of polyamide-imide resin solutions of embodiment 1 are mixed, and then add NMP20 mass parts and make slurry, add 12 crown 4 ether powders (0.2 mass of binder weight) as crown ether in this slurry parts) to make a slurry. The slurry is coated on a copper foil with a thickness of 12 μm, and the gap during coating is changed, and it is coated with several thicknesses. After drying at 80° C. for 1 hour, the electrode is pressed and formed by rolling, and the electrode is formed at 200 After vacuum drying at ℃ for 2 hours, punched into 2cm 2 , made into a negative electrode. The electrolyte solution permeability of this negative electrode was confirmed to be 15 seconds. ...

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Abstract

The present invention provides a non-aqueous electrolyte that maintains high battery capacity and low volume expansion rate even when the negative electrode is dried at low temperature (less than 250°C), has high initial charge and discharge efficiency, excellent cycle characteristics, and uses Si-dispersed particles in SiO2 as an active material. Negative electrode for secondary battery, method for producing the same, and lithium ion secondary battery using the negative electrode. Negative electrode for non-aqueous electrolyte secondary battery, which contains: (A) Si-dispersed particles in SiO2, (B) polyamideimide resin, (C) auxiliary conductive material containing carbon fiber and carbon black, and (D) improved Electrolyte-permeable substances.

Description

technical field [0001] The present invention relates to a negative electrode for a nonaqueous electrolyte secondary battery, a method for producing the same, and a lithium ion secondary battery. Background technique [0002] In recent years, with the remarkable development of portable electronic equipment, communication equipment, etc., non-aqueous electrolyte secondary batteries with high energy density are strongly desired from the viewpoint of economy, miniaturization and weight reduction of equipment. Conventionally, as a strategy for increasing the capacity of such nonaqueous electrolyte secondary batteries, it is known to use oxides such as B, Ti, V, Mn, Co, Fe, Ni, Cr, Nb, Mo, etc. (Patent No. 3008228, Patent No. 3242751: Patent Documents 1 and 2), M 100-x Si x (x≥50 atomic %, M=Ni, Fe, Co, Mn) as a negative electrode material (Patent No. 3846661: Patent Document 3), a method of using silicon oxide in the negative electrode material (Patent No. 2997741 Publication ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/139
CPCH01M4/134H01M4/1395H01M4/386H01M4/622H01M4/625H01M10/0525H01M2004/027Y02E60/10H01M4/0404H01M4/0471H01M4/131H01M4/1391H01M4/364H01M4/485H01M4/62H01M4/366
Inventor 宫胁悟古屋昌浩池田达彦须之内和宏池田正雄
Owner SHIN ETSU CHEM CO LTD
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