Negative electrode material, making method, lithium ion secondary battery, and electrochemical capacitor

A negative electrode material, secondary battery technology, applied in the fields of electrochemical capacitors and lithium ion secondary batteries, can solve the problem that a single carbon coating is not enough to achieve high charge/discharge capacity and good cycle performance of lithium ion secondary batteries, etc. Achieve the effect of improved cycle performance and high charge/discharge capacity

Active Publication Date: 2009-12-23
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The present inventors have found that a significant improvement in battery characteristics can be achieved by coating the surface of particles with silicon crystallites dispersed in a silicon compound with carbon, but a single carbon coating is not sufficient to achieve the high charge / discharge required for lithium-ion secondary batteries capacity and good cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The batch furnace was charged with 300 g of silicon oxide particles of the general formula SiOx (x=1.02) having an average particle size of 8 μm. The furnace was evacuated to a pressure below 100 Pa by means of an oil-sealed rotary vacuum pump, while it was heated to and maintained at 850°C. Feed CH at 2NL / min 4 Gas, carbon coating treatment was carried out for 10 hours. A reduced pressure of 3000 Pa was maintained during the treatment. At the end of the treatment, the furnace was cooled to obtain about 320 g of a black powder. This black powder is a conductive powder having a carbon coverage of 7.2% by weight based on silicon oxide particles, in which a diffraction peak attributed to Si(111) different from silicon oxide is observed around 2θ=28.4°, and the powder consists of the following particles Composition: The particle has a structure in which silicon microcrystals are dispersed in a silicon compound and the surface of the particle is coated with a carbon coati...

Embodiment 2

[0060] The batch furnace was charged with 300 g of silicon oxide particles of the general formula SiOx (x=1.02) having an average particle size of 8 μm. The furnace was evacuated to a pressure below 100 Pa by means of an oil-sealed rotary vacuum pump, while it was heated to and maintained at 750°C. While feeding acetylene gas at 2 NL / min, carbon coating treatment was performed for 12 hours. A reduced pressure of 2500 Pa was maintained during the treatment. At the end of the treatment, the furnace was cooled to obtain about 320 g of a black powder. The black powder is a conductive powder with a carbon coverage of 6.3% by weight, in which a diffraction peak attributed to Si(111) different from silicon oxide is observed around 2θ=28.4°, and is composed of particles having A structure in which silicon crystallites are dispersed in a silicon compound and the surface of the particles is coated with a carbon coating. The x-ray diffraction peak around 2θ=28.4° has a half-peak width...

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Abstract

The invention relates to a negative electrode material, a making method, a lithium ion secondary battery and an electrochemical capacitor. A conductive powder is provided in which particles having silicon crystallites dispersed in a silicon compound are coated on their surface with carbon. The conductive powder develops a diffraction peak assigned to Si(111) around 2theta=28.4 DEG on x-ray diffractometry (Cu-Kalpha) using copper as the counter cathode, the peak having a half width of at least 1.0 DEG, and has a specific resistance of up to 50 mOmega. The powder is used as a negative electrode material to construct a non-aqueous electrolyte secondary battery, which has a high charge / discharge capacity and improved cycle performance.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery, typically a lithium ion secondary battery, and an electrochemical capacitor. In particular, the present invention relates to an anode material suitable for such a battery, which provides high charge / discharge capacity and good cycle performance to a lithium ion secondary battery, and to a preparation method thereof. Background technique [0002] With the recent rapid development of portable electronic devices and communication devices, secondary batteries having high energy density are highly demanded from the viewpoint of economy and reduction in size and weight. Prior art known attempts for increasing the capacity of such secondary batteries include the use of the following as negative electrode materials: oxides of V, Si, B, Zr, or Sn, etc., and their composite oxides (JP-A 5-174818, JP-A 6-60867), melt-quenched metal oxides (JP-A 10-294112), silicon oxide (Japanese Patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/62H01M4/04H01M10/36H01M10/40H01G9/00H01G9/042H01M4/36H01G11/22H01G11/30H01G11/32H01M4/48H01M4/485H01M4/58H01M4/587
CPCY02E60/122H01M4/48H01M10/0525H01M4/134Y02E60/10H01M4/0428H01M4/386H01M4/5825H01M10/05
Inventor 福冈宏文渡边浩一朗樫田周宫胁悟大庭敏夫
Owner SHIN ETSU CHEM CO LTD
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