NEGATIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a negative electrode active material for lithium ion secondary battery capable of expressing superior charge and discharge cycle characteristics by relaxing an effect of volume change during charge and discharge.

SOLUTION: The negative electrode active material for lithium ion secondary battery comprising a material including at least silicon and oxygen in constituent elements includes scale-like powder with a thickness of 30-500 nm and a ratio of average major axis/thickness is 10-100, and wherein oxygen content is 5-38 wt.%.

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