Dual function high efficiency silicon electrode prelithiation strategy

The Si anode holds the most potential among anode materials, however, its low initial coulombic efficiency has been a serious impediment to commercial progress. In this study, we immersed Si electrode in the prelithiation reagent of lithium-biphenyl(Li-Bp)/2-methyltetrahydrofuran(2-Me-THF) for 5 min, resulting in an initial coulomb efficiency was increased to 135%. The full cell assembled with LiFePO 4 has a coulomb efficiency of 89.1% for the first turn and the capacity retention rate of 87.2% after 100 cycles. Prelithiation reagent after drying can form a protective layer on the surface of the Si electrode, and the prelithiated Si electrode can stably exist for more than 9 h at the dew point (DP) of -25 ℃, which provides a strategy for industrial production.