Discharge capacities of Li-Si alloy is very high which corresponds to a capacity as high as 4,000mAh/g. However, reversibility of the Si powder is rather poor because of its volume change during charging-discharging reaction [1-2]. To improve the charge-discharge reaction of anode, graphite particles were coated with nano-size silicon powders by gas suspension spray coating method, and their electrochemical characteristics were investigated. Commercial synthetic graphite with average particle diameter of about 10mum (MCMB 1028, Osaka gas) was used as raw material. Ethanol-based silicon-containing precursor was sprayed to the graphite particles to coat the surface, and coated particles were calcined in the furnace in the range of 500 C under inert atmosphere after coating process.
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