Lithium ion battery electrolyte for pre-lithiation of silicon-based negative electrode

The invention discloses a silicon-based negative electrode pre-lithiated lithium ion battery electrolyte, which comprises an organic solvent, a lithium salt and a pre-lithiation additive, the pre-lithiation additive comprises a solvent and a pre-lithiation agent, the solvent is selected from at least one of dimethyl tetrahydrofuran and tetrahydrofuran, and the pre-lithiation agent is selected from at least one of biphenyl lithium or naphthalene lithium. The pre-lithiation additive has a low oxidation-reduction potential, can spontaneously react with a silicon-based negative electrode to realize pre-embedding of lithium ions in the silicon negative electrode, and can preferentially form an effective SEI film on the surface of the silicon-based negative electrode, the formed SEI has compact and elastic LixSiOy, the consumption of active lithium in a positive electrode and an electrolyte is reduced, and the service life of the positive electrode is prolonged. And the first coulombic efficiency and the cycle perf