Non-aqueous electrolyte secondary battery, negative electrode, negative electrode material, and preparation of si-o-al composite

一种非水电解质、二次电池的技术，应用在非水电解质蓄电池电极、电池电极、二次电池等方向，能够解决第1次循环充电/放电效率低等问题，达到高循环充电/放电效率、改善循环性能、低体积膨胀的效果

Inactive Publication Date: 2010-03-03
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0043] The present inventors have attempted to seek negative electrode active materials that have high battery capacity over carbonaceous materials, suppress volume change due to expansion inherent in silicon-based active materials, and overcome the 1st cycle charge / discharge of silicon oxide The disadvantage of low efficiency

Method used

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  • Non-aqueous electrolyte secondary battery, negative electrode, negative electrode material, and preparation of si-o-al composite
  • Non-aqueous electrolyte secondary battery, negative electrode, negative electrode material, and preparation of si-o-al composite
  • Non-aqueous electrolyte secondary battery, negative electrode, negative electrode material, and preparation of si-o-al composite

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preparation example Construction

[0067] Preparation of Si-O-Al Composite

[0068] The Si-O-Al composite can be prepared by reacting silicon oxide with aluminum. As used herein, "silicon oxide" refers to an amorphous oxide form of silicon obtained by heating a mixture of silicon dioxide and silicon to produce silicon oxide gas, and cooling the gas for deposition. Specifically, silicon oxide gas is generated at a temperature of 1,100-1,500° C. under reduced pressure and transferred to a deposition chamber at 500-1,100° C. where it is solidified and collected. The "silicon oxide" consists of the general formula SiO x means, where x, as determined by elemental analysis of the deposit, is in the range: 1.0≤x<1.6, and preferably 1.0≤x≤1.2. The starting mixture contained silica and silicon in a molar ratio of about 1:1.

[0069] Silica undergoes a reduction reaction with aluminum to produce silicon and alumina according to the following reaction scheme (I).

[0070] SiO+2 / 3Al→Si+1 / 3Al 2 o 3 (I)

[0...

Embodiment 1 to 5 and comparative example 1 to 3

[0131] The active material powder was diluted with N-methylpyrrolidone, optionally mixed with a dispersion of the conductive agent acetylene black in N-methylpyrrolidone (solids 17.5% by weight). A polyimide resin (U-Varnish A of Ube Industries Ltd., solid 18.1% by weight) was added thereto as a binder to form a slurry. The slurry was coated onto a 12 μm thick copper foil by a doctor blade with a gap of 50 μm, vacuum dried at 200° C. for 2 hours, and pressed into a negative electrode shaped form by roll pressing at 60° C. Finally, punch out 2cm from this shaped form 2 and used it as the negative electrode. The compositions of the solid components are shown in Table 1.

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Abstract

The invention relates to a non-aqueous electrolyte secondary battery, a negative electrode, a negative electrode material and a preparation of Si-O-Al composite. An Si-O-Al composite comprising silicon, silicon oxide, and aluminum oxide exhibits a powder XRD spectrum in which the intensity of a signal of silicon at 28.3 DEG is 1-9 times the intensity of a signal near 21 DEG. A negative electrode material comprising the Si-O-Al composite is used to construct a non-aqueous electrolyte secondary battery which is improved in 1st cycle charge / discharge efficiency and cycle performance while maintaining the high battery capacity and low volume expansion upon charging of silicon oxide.

Description

technical field [0001] The present invention generally relates to nonaqueous electrolyte secondary batteries, typically lithium ion secondary batteries. In particular, the present invention relates to negative electrode materials comprising Si-O-Al complexes as active materials in such batteries, methods for preparing Si-O-Al complexes, negative electrodes and nonaqueous electrolytes produced therefrom. secondary battery. Background technique [0002] With the rapid progress of portable electronic devices and communication equipment in recent years, non-aqueous electrolyte secondary batteries having high energy density are highly demanded in terms of cost, size and weight reduction. Many measures for increasing the capacity of such nonaqueous electrolyte secondary batteries are known in the art. For example, JP 3008228 and JP 3242751 disclose negative electrode materials containing oxides of B, Ti, V, Mn, Co, Fe, Ni, Cr, Nb and Mo and composite oxides thereof. Obtained by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/36H01M4/38H01M4/48H01M4/62H01M4/04H01M10/36H01M10/40H01M4/13
CPCC01P2006/12Y02E60/122C01P2002/72H01M4/622H01M10/0525C01P2006/40C01P2002/74H01M4/38H01M2004/021H01M4/364H01M4/485Y02E60/10C01P2002/70H01M4/131H01M4/134H01M4/386
Inventor 中西铁雄渡边浩一朗
Owner SHIN ETSU CHEM CO LTD
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