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Non-aqueous electrolyte secondary battery negative electrode material, making method, lithium ion secondary battery, and electrochemical capacitor

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte storage batteries, electrolytic capacitors, secondary batteries, etc., can solve the problems of cycle performance degradation, limited charging/discharging capacity, and insufficient conductivity, etc. The method is simple, Improved cycle performance and high capacity effects

Active Publication Date: 2009-08-12
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regarding the technique of imparting conductivity to the negative electrode material, JP-A2000-243396 encountered a problem that solid-solid fusion adhesion could not form a uniform carbon coating, resulting in insufficient conductivity
The method of JP-A 2000-215887 is capable of forming a uniform carbon coating, but as a result, the silicon-based negative electrode material undergoes excessive expansion and contraction when absorbing and desorbing lithium ions, and as a result cannot be practically implemented
Due to the decrease in cycle performance, and the charge / discharge capacity must be limited to prevent this deterioration in cycle performance
In JP-A 2002-42806, although the improvement in the cycle performance is considerable, as the charge / discharge cycle is repeated, because of the precipitation of silicon crystallites, the insufficient structure of the carbon coating, and the inconsistency between the carbon coating and the substrate Fully fused, so the capacity gradually decreases and drops suddenly after a certain number of charge / discharge cycles
Therefore, this method is not sufficient for use in secondary batteries

Method used

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  • Non-aqueous electrolyte secondary battery negative electrode material, making method, lithium ion secondary battery, and electrochemical capacitor
  • Non-aqueous electrolyte secondary battery negative electrode material, making method, lithium ion secondary battery, and electrochemical capacitor
  • Non-aqueous electrolyte secondary battery negative electrode material, making method, lithium ion secondary battery, and electrochemical capacitor

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Embodiment 1

[0057] 200 g of the general formula SiO with an average particle size of 8 μm x (x = 1.02) silicon oxide powder was filled into a batch heating furnace. The furnace was evacuated to a pressure below 100 Pa by means of an oil-sealed rotary vacuum pump, while the furnace was heated to 1150°C at a rate of 300°C / hr and maintained at this temperature. When input CH at 0.5NL / min 4 In gas, the graphite coating treatment was carried out for 5 hours. A reduced pressure of 2000 Pa was maintained during the treatment. At the end of the treatment, the furnace was cooled to obtain approximately 220 g of a black powder. The black powder is a conductive powder with an average particle size of 8.2 μm and a graphite coverage of 12% by weight. The powder was analyzed by microscopic Raman spectroscopy to obtain -1 and 1580cm -1 Raman spectra with peaks near the Raman shift ( figure 1 ), whose intensity ratio I 1330 / I 1580 is 2.0. When observing the powder under the SEM, it was found t...

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Abstract

A negative electrode material comprises a conductive powder of particles of a lithium ion-occluding and releasing material coated on their surface with a graphite coating. The graphite coating, on Raman spectroscopy analysis, develops broad peaks having an intensity I 1330 and I 1580 at 1330 cm -1 and 1580 cm -1 Raman shift, an intensity ratio I 1330 / I 1580 being 1.5 < I 1330 / I 1580 < 3.0. Using the negative electrode material, a lithium ion secondary battery having a high capacity and improved cycle performance can be manufactured.

Description

technical field [0001] The present invention relates to a negative electrode material for a nonaqueous electrolyte secondary battery, which exhibits high charge / discharge capacity and satisfactory cycle performance when used as a negative electrode active material in a lithium ion secondary battery, and also The invention relates to a preparation method of the negative electrode material of the above-mentioned non-aqueous electrolyte secondary battery, a lithium ion secondary battery and an electrochemical capacitor. Background technique [0002] With the recent remarkable development of portable electronic devices, communication devices, etc., there is a strong demand for high energy density secondary batteries from the viewpoints of economy, size, and weight reduction. A prior art method of increasing secondary battery capacity is to use oxides as negative electrode materials, such as oxides of V, Si, B, Zr, Sn, etc. or their composite oxides (see JP-A5-174818 and JP-A6-0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/38H01M4/48H01M4/58H01M4/04C23C16/26C23C16/52H01M10/40H01G9/04H01G11/06H01G11/22H01G11/86H01M10/052
CPCC23C16/4417Y02E60/122C23C16/26H01M10/052H01M4/587H01M4/366H01M4/485H01M4/131H01M4/0428Y02E60/10H01M4/02H01M4/04H01M4/58H01M10/05H01M2004/027
Inventor 福冈宏文樫田周宮脇悟大庭敏夫
Owner SHIN ETSU CHEM IND CO LTD
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