POWDER FOR NEGATIVE POLE MATERIAL OF LITHIUM ION SECONDARY CELL, NEGATIVE POLE OF LITHIUM ION SECONDARY CELL USING SAME, AND LITHIUM ION SECONDARY CELL

摘要

Provided is a negative electrode material powder for a lithium ion secondary battery, including SiOx (0.4@x@1.2), in which 1H is inevitably included therein and a peak area of a chemical shift of 0.2-0.4 ppm is between 5% and 40% of an entire peak area in a spectrum 1H measured by means of nuclear magnetic resonance spectroscopy. A peak area of a chemical shift of 1.1-2.0 ppm is preferably between 5% and 95% of the entire peak area in a spectrum for 1H measured by means of nuclear magnetic resonance spectroscopy As a result, there can be provided a negative electrode material powder for a lithium ion secondary battery used in a lithium ion secondary battery having a large discharge capacity, satisfactory initial efficiency, and cycle characteristics.