NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To control capacity deterioration in a nonaqueous electrolyte secondary battery composed of lithium manganese composite oxide for a positive pole and carbon material for a negative pole, which is caused when it is full- charged and left under high temperature circumstance. SOLUTION: This nonaqueous electrolyte secondary battery comprises the positive pole composed of lithium manganese composite oxide with spinel structure, a nonaqueous electrolyte and the negative pole composed of carbon material which is enabled to electrochemically dope and dedope lithium. In this case, carbon material is low crystal carbon in which lattice spacing (d002) of 002 plane is >=0.360 nm and <=0.390 nm, and capacity density of the negative pole in full-charged is >=150 Ah/kg and <=250 Ah/kg. It enables obtaining the nonaqueous electrolyte secondary battery which is superior in high temperature stability.