Nonaqueous electrolyte lithium secondary battery

摘要

A lithium secondary battery comprises an anode capable of intercalating or disintercalating lithium ions, a cathode configured with a lithium-containing oxide, and a nonaqueous electrolyte solution. The lithium-containing oxide comprises a lithium nickel based oxide. The nonaqueous electrolyte solution comprises vinyl ethylene carbonate (VEC) and a mono-nitrile compound. This lithium secondary battery solves the deterioration of charge/discharge cycle characteristics caused by a lithium nickel based oxide used for a cathode, and also controls the decomposition reaction of electrolyte to solve the swelling phenomenon even though the battery is stored at a high temperature or charged/discharged in a fully-charged state, thereby improving high-temperature life characteristics.

主权项

1. A lithium secondary battery comprising an anode capable of intercalating or disintercalating lithium ions, a cathode configured with a lithium-containing oxide, and a nonaqueous electrolyte solution,
wherein the lithium-containing oxide comprises a lithium nickel based oxide, and the nonaqueous electrolyte solution comprises vinyl ethylene carbonate (VEC) of the following chemistry figure 1 and a mono-nitrile compound of the following chemistry figure 2 at the same time: wherein R11 is an alkyl group having 3 to 4 carbons, wherein the amount of the vinyl ethylene carbonate is 3.0 parts by weight based on 100 parts by weight of the nonaqueous electrolyte solution, and the amount of the mono-nitrile compound is 2.0 parts by weight based on 100 parts by weight of the nonaqueous electrolyte solution.