Pin lithi-ion

Abstract

The invention relates to the field of lithium batteries, and specifically to lithium-ion batteries. A lithium-ion battery consists of at least a cathode and an electrolyte; the electrolyte consists of an additive, the additive contains at least fluoroethylene carbonate (FEC), and the mass percentage of FEC in the electrolyte is a; the electrolyte has a conductivity of d mS / cm; the initial Coulomb efficiency of the cathode is c; the cathode consists of a cathode active material, the cathode active material consists of a silicon-based material, and the mass percentage of silicon-based material in the cathode active material is b; and a, b, c, and d satisfy at least one of the following conditions: 0