Synergy of Highly Reversible ω-Li₃V₂O₅ Anodes and Fluorine-Containing Additive Electrolytes Promises Low-Temperature-Tolerant Li-Ion Batteries

Stable cycling of rechargeable Li-ion batteries (LIBs) at low temperatures is important for cold-climate and high-altitude applications, but it is plagued by severe power loss. Here, we report on an effective synergy to boost the low-temperature performance of LIBs, whereby highly stable ω-Li3V2O5 anodes with high Li+-insertion kinetics are combined with fluorine-containing additive (FCA) electrolytes. The FCA in the electrolyte promotes the formation of the stable and low-resistance LiF-rich solid-electrolyte interface (SEI) layer on the anode surface. The disordered ω-Li3V2O5 electrode combined with the FCA electrolyte can be reversibly cycled over 1000 cycles at room temperature and delivers a highly stable capacity of 201.6 mAh g–1 at 0.1 A g–1 at −20 °C, retaining 70.0% of its room-temperature capacity. Furthermore, the LiMn2O4|ω-Li3V2O5 full cell with the FCA electrolyte exhibiting superior low-temperature performances is demonstrated, which is much better than conventional LIBs.