| abstract |
The invention provides an electrolyte for a silicon carbon system lithium ion battery and a silicon carbon system lithium ion battery. The electrolyte includes a non-aqueous organic solvent, an additive and a conductive lithium salt, and the additive includes a grafted polysilane compound, fluoroethylene carbonate and lithium difluorophosphate; the silicon-carbon system lithium ion battery includes the above-mentioned electrolytic solution. liquid. The introduction of grafted polysilane compounds into the additive can significantly improve the effect of high temperature inhibition of gas production on the positive electrode material; in addition, it forms a tough SEI film on the surface of the negative electrode, which effectively reduces the expansion of the silicon carbon negative electrode during the cycle. In addition, fluoroethylene carbonate and lithium difluorophosphate are also introduced into the additive, and the three substances synergize to form a composite film, which is more conducive to the efficient conduction of Li + to enhance the low-temperature discharge performance of the battery . |