Facile Fabrication of FePO₄-V₂O₅-Graphene Oxide Recovered From Spent LiFePO₄ Batteries as High-Performance Cathode for Lithium/Sodium-Ion Batteries

The resource scarcity and pollution leakage risk caused by discarding the spent power lithium-ion batteries has aroused growing concern. Recovering and regenerating the cathode material from spent power lithium-ion batteries in an easy and environmentally friendly manner remains a significant challenge and an area of focus in battery research. Hence, a green and convenient method to recover FePO4 from spent LiFePO4 cathode powder by using Na2S2O8 as an oxidizer and as cathode materials for lithium/sodium-ion batteries (LIBs/SIBs) is reported. Benefiting from the remarkable graphene oxide (GO) and vanadium oxide (V2O5) coating, the regenerated FePO4-V2O5-graphene oxide (FePO4-V2O5-GO) is suitable for Li/Na storage (153 mAh g(-1) at 0.2C/118 mAh g(-1) at 0.5C). The high capacity retention, that stable for 300 cycles in LIBs and 300 cycles for SIBs, is also realized due to the stable structure. This work provides a green strategy for regenerating the cathode of spent lithium-ion batteries and designing cathodes of alkali metal ion batteries.