NEGATIVE-ELECTRODE ACTIVE SUBSTANCE FOR LITHIUM-ION SECONDARY BATTERY, ITS PRODUCTION METHOD, AND LITHIUM-ION SECONDARY BATTERY USING THE ACTIVE SUBSTANCE

摘要

PROBLEM TO BE SOLVED: To provide a negative-electrode active substance for a lithium-ion secondary battery having a high capacity and excellent cycle performance.

SOLUTION: A method for producing silicon oxide includes (a) a process for forming a silicon oxide layer on a substrate by passing silicon atoms through an oxygen atmosphere and supplying the silicon atoms onto the substrate, and (b) a process for obtaining silicon oxide containing silicon and oxygen in a prescribed ratio by separating the silicon oxide layer from the substrate and pulverizing the oxide layer. The negative electrode active substance is obtained by the method.

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