A lithium secondary battery includes 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 includes a lithium nickel based oxide. The nonaqueous electrolyte solution contains vinyl ethylene carbonate (VEC) and a mono-nitrile compound at the same time. 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.
锂二次电池包括一个能够夹杂或不夹杂
锂离子的阳极、一个配置有含
锂氧化物的阴极和一个非
水电解质溶液。含
锂氧化物包括
镍基
锂氧化物。非
水电解质溶液同时含有
乙烯基碳酸乙烯酯(
VEC)和单腈化合物。这种
锂二次电池解决了用于正极的
锂镍基氧化物造成的充放电循环特性恶化问题,还控制了电解液的分解反应,解决了电池在高温储存或完全充电状态下充放电时的膨胀现象,从而提高了高温寿命特性。