Lithium supplement additive for lithium ion battery, lithium supplement electrolyte and application of lithium supplement additive and lithium supplement electrolyte

The invention provides a lithium supplement additive for a lithium ion battery, a lithium supplement electrolyte and application thereof, the lithium supplement additive is a fluorine-containing imino lithium salt or a mixture of a plurality of fluorine-containing imino lithium salts, the fluorine-containing imino lithium salt is selected from the following structure: [chemical formula 1] # imgabs 0 # and [chemical formula 2] # imgabs 1 #, and x in the [chemical formula 1] and [chemical formula 2] is an integer greater than or equal to 1. According to the technical scheme, the accuracy and the uniformity of lithium supplement of the negative electrode can be controlled, the operation process is simple and reliable, and the first coulombic efficiency, the cycle performance and the battery energy density of the battery can be effectively improved. 本发明提供了一种锂离子电池用补锂添加剂、补锂电解液及其应用，所述补锂添加剂为一种含氟的亚氨基锂盐或者几种含氟的亚氨基锂盐的混合物，含氟的亚氨基锂盐选自以下结构，[化学式1]#imgabs0#[化学式2]#imgabs1#其中，[化学式1]、[化学式2]中的x为≥1的整数。通过本发明的技术方案，可以控制负极补锂的精确性和均匀性，操作