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

Abstract 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 FePO 4 from spent LiFePO 4 cathode powder by using Na 2 S 2 O 8 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 (V 2 O 5 ) coating, the regenerated FePO 4 –V 2 O 5 –graphene oxide (FePO 4 –V 2 O 5 –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.