Lithium secondary battery electrolyte, lithium secondary battery and electric equipment

The invention provides a lithium secondary battery electrolyte, a lithium secondary battery and electric equipment, and belongs to the field of lithium secondary battery manufacturing. The additive in the lithium secondary battery electrolyte comprises tetracyano alkoxy aliphatic straight-chain alkane as shown in a structural formula I and/or a structural formula II, and tri (trimethylsilane) borate and/or tri (trimethylsilane) phosphite, the electrolyte can solve the problems of poor rate capability, cycle performance, storage performance and the like of the battery at high temperature and high pressure caused by the electrolyte to a certain extent. 本申请提供一种锂二次电池电解液、锂二次电池以及用电设备，属于锂二次电池制造领域。锂二次电池电解液中的添加剂包括结构式如式I和/或式II所示的四氰基烷氧基脂肪族直链烷烃以及三(三甲基硅烷)硼酸酯和/或三(三甲基硅烷)亚磷酸酯，该电解液能够在一定程度上解决电解液导致电池在高温、高压下存在的倍率性能、循环性能以及存储性能等欠佳的问题。