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Negative electrode material for non-aqueous electrolyte secondary batteries, manufacturing method therefor, and lithium-ion secondary batteries

一种非水电解质、二次电池的技术，应用在二次电池、电池电极、用于材料和表面科学的纳米技术等方向，能够解决降低气体对策、不够充分等问题，达到降低起火和破裂、制造方法简单、安全性和循环特性优异的效果

Active Publication Date: 2011-05-11
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, for negative electrode active materials, countermeasures to reduce gas generation are not sufficient

Method used

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  • Negative electrode material for non-aqueous electrolyte secondary batteries, manufacturing method therefor, and lithium-ion secondary batteries
  • Negative electrode material for non-aqueous electrolyte secondary batteries, manufacturing method therefor, and lithium-ion secondary batteries
  • Negative electrode material for non-aqueous electrolyte secondary batteries, manufacturing method therefor, and lithium-ion secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Prepare a powder obtained by dispersing silicon nanoparticles in silicon oxide, the powder has an average particle diameter of 5 μm and a BET specific surface area of ​​3.5 m 2 / g. Then, this powder was dried at 120° C. for 6 hours in an electric drying oven blown with nitrogen gas to prepare raw material powder [A].

[0095] Then, at room temperature, first prepare a solution obtained by dissolving 30 g of magnesium ethoxide (Magnesium diethoxide) powder in 400 g of dehydrated ethanol, and then slowly put 100 g of the previously dried raw material powder [A] into the solution , to produce a slurry. In order to prevent moisture in the atmosphere from diffusing into the beaker, these operations were performed while blowing dry nitrogen gas into the beaker.

[0096] Then, 5 grams (g) of pure water was added dropwise over 10 minutes while stirring, and stirring was continued for 3 hours in this state. Thereafter, the supernatant liquid was discarded, and filtered under ...

Embodiment 2

[0120] Into a 2-liter beaker in which 300 g of dehydrated isopropyl alcohol (IPA) had been put, 100 g of the raw material powder [A] used in Example 1 was slowly put in at room temperature to prepare a slurry.

[0121] Then, a mixed solution of 100 g of dehydrated isopropanol and 50 g of aluminum tri-sec-butoxide (Aluminium tri-sec-butoxide) prepared in a separate container was added and stirred. In order to prevent moisture in the atmosphere from diffusing into the beaker, these operations were performed while blowing dry nitrogen gas into the beaker.

[0122] Here, 10 g of pure water was added dropwise over 10 minutes while stirring, and then stirring was continued for 3 hours in this state. Thereafter, the supernatant liquid was discarded, and filtered under reduced pressure using a suction filter to obtain a cake, which was then dried at 100° C. for 3 hours under reduced pressure. The resulting powder weighed 105 grams. In addition, as a result of analyzing this powder w...

Embodiment 3

[0127] Into a 2-liter beaker in which 300 g of dehydrated isopropyl alcohol (IPA) had been put, 100 g of the raw material powder [A] used in Example 1 was slowly put in at room temperature to prepare a slurry.

[0128] Then, a mixed solution of 100 g of dehydrated isopropanol and 50 g of titanium tetraisopropane oxide (TTIP) prepared in a separate container was added and stirred. In order to prevent moisture in the atmosphere from diffusing into the beaker, these operations were performed while blowing dry nitrogen gas into the beaker.

[0129] Here, 10 g of pure water was added dropwise over 10 minutes while stirring, and then stirring was continued for 3 hours in this state. Thereafter, the supernatant liquid was discarded, and filtered under reduced pressure using a suction filter to obtain a cake, which was then dried at 100° C. for 3 hours under reduced pressure. The powder obtained was 106 g. In addition, as a result of analyzing this powder with an inductively coupled...

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Abstract

The present invention is a negative electrode material for non-aqueous electrolyte secondary batteries, comprising at least: particles wherein silicon nanoparticles are dispersed in silicon oxide (silicon oxide particles); and a metal oxide coating formed on a surface of the silicon oxide particles. As a result, there is provided a negative electrode material for non-aqueous electrolyte secondary batteries that enables the production of a negative electrode suitable for lithium-ion secondary batteries and the like that provides improved safety and cycle performance over conventional negative electrode materials.

Description

technical field [0001] The invention relates to a negative electrode material for a nonaqueous electrolyte secondary battery, a manufacturing method and a lithium ion secondary battery. When the negative electrode material for a nonaqueous electrolyte secondary battery is used as a negative electrode active material for a lithium ion secondary battery, It has good safety and cycle characteristics. Background technique [0002] In recent years, with the remarkable development of portable electronic devices and communication devices, there has been a strong desire for a secondary battery with high energy density from the standpoint of economy, miniaturization and weight reduction of the devices. [0003] As a means to achieve this desire, there are methods of using silicon oxide in the negative electrode material (refer to Japanese Patent No. 2997741 communique), and a method of coating a carbon layer on the surface of silicon carbide particles according to the chemical vapor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/134H01M4/1395H01M10/0525
CPCB82Y30/00H01M4/38H01M4/62Y02E60/10H01M4/386H01M4/405H01M4/483H01M4/502H01M4/523H01M10/0525H01M2220/30Y02P70/50
Inventor 渡边浩一朗中西铁雄谷口一行
Owner SHIN ETSU CHEM CO LTD
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