SILICON OXIDE POWDER, LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE MATERIAL INCLUDING THE SAME, LITHIUM ION SECONDARY BATTERY INCLUDING THE MATERIAL, AND METHOD FOR PRODUCING SILICON OXIDE POWDER FOR LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide: a lithium ion secondary battery negative electrode material, with which a lithium ion secondary battery having high charge/discharge capacity can be obtained and which is easy in handling without being ignited by a reaction with air and water, and has high industrial practicality; and a method for producing the lithium ion secondary battery negative electrode material.SOLUTION: In a lithium-containing silicon oxide powder, when area intensities of peaks at 2=22.1°±0.2°, 28.4°±0.2°, 40.5°±0.2° and 56.2°±0.2° in an X-ray diffraction (XRD) using a Cu-k ray source are denoted as A, B, C and D, respectively, relationships of 0.01B/A5.0, C/A1.0 and D/A1.0 are satisfied.