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Method for manufacturing negative electrode active material for use in non-aqueous electrolyte secondary battery, negative electrode material for use in non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

A negative electrode active material and non-aqueous electrolyte technology, which is applied in the field of negative electrode active material manufacturing, can solve the problems of inability to maintain the volume expansion rate of silicon oxide, high cost, and difficulty in obtaining it, achieve good cycle characteristics and efficiency, improve electrical conductivity, Effect of suppressing volume change

Active Publication Date: 2012-10-17
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to dope Li metal, the following methods are disclosed: a method of sticking lithium (Li) foil on the surface of the negative electrode active material (Patent Document 26); and a method of evaporating Li on the surface of the negative electrode active material (Patent Document 27) However, if Li foil is pasted, there will be the following problems: Li thin body equivalent to the initial efficiency of the silicon oxide negative electrode is difficult to obtain and the cost is high; vapor deposition by Li vapor will complicate the manufacturing steps, impractical etc.
However, silicon is an active material. Although it has higher initial efficiency and battery capacity than silicon oxide, it will show a volume expansion rate of up to 400% when charging. Even if it is added to a mixture of silicon oxide and carbon materials, not only The volume expansion rate of silicon oxide cannot be maintained, and as a result, it is necessary to add more than 20% by mass of carbon material to suppress the battery capacity to 1000mAh / g
On the other hand, the method of obtaining a mixed solid by simultaneously generating silicon and silicon oxide vapor requires a production step at a high temperature exceeding 2000°C because the vapor pressure of silicon is low, and there are problems in operation

Method used

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  • Method for manufacturing negative electrode active material for use in non-aqueous electrolyte secondary battery, negative electrode material for use in non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery
  • Method for manufacturing negative electrode active material for use in non-aqueous electrolyte secondary battery, negative electrode material for use in non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery
  • Method for manufacturing negative electrode active material for use in non-aqueous electrolyte secondary battery, negative electrode material for use in non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] use as figure 1 In the catalytic CVD apparatus shown, silicon oxide powder 1 is coated with carbon as described below. The silicon oxide powder 1 is placed statically in the reaction chamber 11 of the catalyst CVD apparatus 100, and carbon vapor deposition is carried out in methane / hydrogen / argon = 540 / 60 / 400 sccm as the reaction gas, and the pressure in the reaction chamber is 1000 Pa. The reaction chamber 11 uses a tungsten filament with a diameter of 1 mm as the catalyst body. The temperature of the holder 18 was set at 500° C., and the reaction was performed for 10 hours.

Embodiment 2、3、4

[0135] Carbon-coated silicon oxide powder 2 (Example 2), polycrystalline silicon powder 1 (Example 3), and polycrystalline silicon powder 2 (Example 4) were performed in the same manner as in the case of the silicon oxide powder 1 in Example 1.

Embodiment 5～9、 comparative example 4～6

[0148] The negative electrode material in the present invention is obtained by using silicon oxide powder or silicon powder coated with carbon. In order to confirm the usefulness of the negative electrode material in the present invention, as described below, using Examples 1 to 4, comparative Each of the negative electrode active materials prepared in Examples 1 to 3 was used to make negative electrode materials, and after using the negative electrode materials to make lithium-ion secondary batteries for evaluation, the charge-discharge capacity and volume expansion rate were measured.

[0149]

[0150]The following powders were used as negative electrode active materials: silicon oxide powder obtained by coating silicon oxide powder 1 with carbon in Example 1 (Examples 5 and 8), and silicon oxide powder 2 obtained by coating carbon with carbon in Example 2. obtained silicon oxide powder (Example 6), polycrystalline silicon powder obtained by coating polycrystalline silicon ...

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Abstract

The present invention provides a method for manufacturing a carbon-coated negative electrode active material for use in a non-aqueous electrolyte secondary battery, wherein a negative electrode active raw material including at least one of silicon oxide powder and silicon powder is coated with carbon by a catalytic CVD method. The present invention also provides a negative electrode material for use in a non-aqueous electrolyte secondary battery and a non-aqueous electrolyte secondary battery using the negative electrode active material. As a result, there is provided a method for manufacturing a negative electrode active material for use in a non-aqueous electrolyte secondary battery in which high battery capacity given by the silicon-based active material is maintained and a volume expansion and a break in the active material are suppressed.

Description

technical field [0001] The present invention relates to a kind of manufacturing method of negative electrode active material, and described negative electrode active material is used in non-aqueous electrolyte secondary battery such as lithium ion secondary battery, and the present invention particularly relates to a kind of non-aqueous electrolyte that manufactures covered carbon A method for a negative electrode active material for a secondary battery. Furthermore, the present invention relates to a negative electrode material for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery, which are obtained using the negative electrode active material. Background technique [0002] In recent years, along with the remarkable development of portable electronic equipment, communication equipment, etc., a non-aqueous electrolyte secondary battery with high energy density has been strongly desired from the viewpoint of economy, miniaturization an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139H01M4/13H01M4/62H01M10/0525H01M4/48
CPCC23C16/44Y02E60/122H01M4/622H01M10/0525H01M4/386H01M4/366H01M4/134C23C16/26C23C16/4417Y02E60/10H01M4/139H01M4/38H01M4/583C01B33/02
Inventor 中西铁雄池田达彦
Owner SHIN ETSU CHEM CO LTD
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