NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery which is suppressed in the deterioration of characteristics caused by to the expansion and compaction of an electrode accompanied by charge and discharge and has a long life and high reliability.

SOLUTION: The non-aqueous electrolyte secondary battery has a battery element laminating and winding a negative electrode and a positive electrode through a separator housed in an outer package. A negative electrode active material has different carbon materials at an inner circumference 1 and an outer circumference 2, and the ratio of its coating area is made the inner circumference coating area/the outer circumference coating area as 4.5/5.5-6.0/4.0. The carbon materials are artificial graphite at the inner circumference and natural graphite at the outer circumference side.

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