GRAPHITE PARTICLE FOR NEGATIVE ELECTRODE OF NONAQUEOUS SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To realize graphite particles for a negative electrode wherein a charge- discharge efficiency and a discharge load characteristic can be more enhanced by solving the problem that the charge-discharge efficiency deteriorates during charging due to decomposition of electrolyte components PC and GBL on graphite surface. SOLUTION: The graphite particles for the negative electrode of a nonaqueous secondary battery capable of storing and releasing lithium ions can be specified by the chemical state ratio of conjugated C-C appearing at around 284 eV is 50 to 72% and the state ratio of C=O appearing at around the 288 eV is 2 to 5% from chemical state ratio obtainable peak intensities at around 284 eV, around 285 eV, around 286 eV, around 288 eV and around 289 eV by a C1s peak separation by X-ray photoelectron spectroscopy. COPYRIGHT: (C)2003,JPO