NEGATIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING NEGATIVE ELECTRODE ACTIVE MATERIAL, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING NEGATIVE ELECTRODE
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United States of America Patent
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Dec 24, 2015
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Jan 23, 2014
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Jan 29, 2013
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In nonaqueous electrolyte secondary batteries that use silicon or silicon oxide as a negative electrode active material, the initial charge-discharge efficiency and the cycle characteristics are improved. A negative electrode active material particle (13a) is a particulate negative electrode active material used for nonaqueous electrolyte secondary batteries, and includes a base particle (14) composed of silicon or silicon oxide and a conductive coating layer (15) that coats at least part of a surface of the base particle (14). A pore (16) is formed in the particle. The pore (16) preferably includes an interfacial pore (16z) formed between the base particle (14) and the coating layer (15).
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