QUALITY CONTROL METHOD FOR NEGATIVE ELECTRODE ACTIVE MATERIAL OF LITHIUM-ION SECONDARY BATTERY, MANUFACTURING METHOD FOR NEGATIVE ELECTRODE OF LITHIUM-ION SECONDARY BATTERY, MANUFACTURING METHOD FOR LITHIUM-ION SECONDARY BATTERY, NEGATIVE ELECTRODE OF LITHIUM-ION SECONDARY BATTERY, AND LITHIUM-ION SECONDARY BATTERY

摘要

A quality control means for a negative electrode active material of a lithium ion secondary battery having an amorphous carbon layer on its surface. It is intended to provide a means capable of performing quality control with sufficient accuracy even when the thickness of the amorphous carbon layer is small. A method for quality control of a negative electrode active material of a lithium ion secondary battery having an amorphous carbon layer on its surface is provided. In the quality control method, the first processing for heating the object to be inspected at a predetermined heating temperature and measuring the D / G ratio by Raman scattering spectroscopy is performed for a predetermined number of times while changing the heating temperature to change the D / Is set as an index of quality control.