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Method for producing silicon-containing particles for anode active material for non-aqueous electrolyte secondary battery, anode member for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and silicon-containing particles for anode active material for non-aqueous electrolyte secondary battery

A negative electrode active material, non-aqueous electrolyte technology, applied in non-aqueous electrolyte storage batteries, active material electrodes, secondary batteries, etc., can solve problems such as unfavorable cost, failure to propose a manufacturing method, etc., and achieve long life, high battery capacity, High volume effect

Active Publication Date: 2015-07-22
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] As mentioned above, in order to use silicon as an active material, metal silicon and silicon alloys with various crystal structures have been proposed, but none of them is cost-effective, and a production method that can be synthesized cheaply in large quantities has not yet been proposed.

Method used

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  • Method for producing silicon-containing particles for anode active material for non-aqueous electrolyte secondary battery, anode member for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and silicon-containing particles for anode active material for non-aqueous electrolyte secondary battery
  • Method for producing silicon-containing particles for anode active material for non-aqueous electrolyte secondary battery, anode member for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and silicon-containing particles for anode active material for non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] Inside the vacuum chamber with an exhaust device composed of an oil diffusion pump, a motorized booster pump and an oil rotary vacuum pump, a copper crucible with a carbon hearth lining with a thickness of 20 μm is set, and 8 kg of metal silicon blocks are dropped in. The chamber is depressurized. The arrival pressure after 2 hours is 2×10 －4 Pa.

[0128] Next, use the electron beam straight-forward electron gun installed in the chamber to start melting the metal silicon block. After the metal silicon block is melted, use the power of 120kW and the electron beam area 2 , continue to carry out evaporation for 2 hours. In vapor deposition, the temperature of the vapor deposition substrate made of stainless steel was controlled at 600°C. The chamber was opened to obtain 3.5 kg of evaporated silicon block.

[0129] Using a jet mill (KJ-25 (trade name) manufactured by KURIMOTO, LTD.), the manufactured vapor-deposited silicon was pulverized and classified to obtain D 50 ...

Embodiment 2

[0131]Silicon-containing particles were obtained in the same manner as in Example 1 except that 8 kg of metal silicon lumps containing 5.0% by mass of aluminum were introduced instead of 8 kg of metal silicon lumps. The silicon-containing particles obtained by the vapor deposition method were heat-treated for 3 hours in an electric furnace having an alumina furnace tube kept at 800°C under a 10%-acetylene / Ar flow. The obtained silicon-containing particle for the negative electrode active material for the non-aqueous electrolyte secondary battery is D 50 =8.0μm, oxygen content 1.1%, BET specific surface area 2.09m 2 / g.

Embodiment 3

[0133] Silicon particles obtained by vapor deposition were obtained in the same manner as in Example 1 except that 8 kg of metal silicon lumps containing 5% by mass of cobalt were put in instead of 8 kg of metal silicon lumps. The silicon-containing particles obtained by vapor deposition were heat-treated for 3 hours under a reduced pressure of 200 Pa in an electric furnace with an alumina furnace tube kept at 800° C. under a 10%-acetylene / Ar flow. The obtained silicon-containing particles for the negative electrode active material of the non-aqueous electrolyte secondary battery are D 50 =8.5μm, oxygen content 0.6%, BET specific surface area is 1.90m 2 / g.

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Abstract

In the present invention, silicon-containing particles for the anode active material of a non-aqueous electrolyte secondary battery are produced by means of silicon-containing particles obtained by means of a vapor deposition method being subjected to heating processing in a reducing atmosphere in a temperature range of, for example, 400-1100°C. Also, in the silicon-containing particles that are for the anode active material of a non-aqueous electrolyte secondary battery and that are created by means of the production method, the amount contained of active oxygen in the anode for a non-aqueous electrolyte secondary battery is caused to be 0.1-1.5 mass%. As a result, during use as an anode active material for a non-aqueous electrolyte secondary battery, it is possible to result in a non-aqueous electrolyte secondary battery having a low volume change during charging / discharging, high initial efficiency, and superior cycle characteristics.

Description

technical field [0001] The present invention relates to a method for producing silicon-containing particles for negative electrode active materials for nonaqueous electrolyte secondary batteries, negative electrode materials for nonaqueous electrolyte secondary batteries, nonaqueous electrolyte secondary batteries, and negative electrodes for nonaqueous electrolyte secondary batteries Silicon-containing particles for active materials. Background technique [0002] In recent years, with the remarkable development of portable electronic equipment, communication equipment, etc., a non-aqueous electrolyte secondary battery with high energy density is urgently needed from the viewpoint of economy, equipment miniaturization and weight reduction. [0003] Since silicon has a theoretical capacity of 4200mAh / g, which is higher than the theoretical capacity of 372mAh / g of carbon materials currently in practical use, it is the most anticipated material for the miniaturization and capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/134H01M10/052
CPCY02E60/122H01M4/134H01M4/386H01M10/0525C01B33/021H01M2004/027Y02E60/10
Inventor 中西铁雄谷口一行山田佳益
Owner SHIN ETSU CHEM IND CO LTD
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