LITHIUM SECONDARY BATTERY

摘要

Provided is a lithium secondary battery having excellent high-temperature cycle characteristics, which comprises a positive electrode that is capable of absorbing and desorbing lithium, a negative electrode, and an electrolyte solution that contains a nonaqueous electrolyte solvent. This lithium secondary battery is characterized in that: a negative electrode active material contains a compound containing elemental silicon; and the surface of the negative electrode contains a phosphorus compound having a cyclic phosphoric acid ester structure wherein -O-P-O- constitutes a part of the ring structure.