A green strategy towards fabricating FePO4-graphene oxide for high-performance cathode of lithium/sodium-ion batteries recovered from spent batteries

Owing to the growing concern about the resource shortage and environmental pollution caused by the vast usage of lithium-ion batteries, the recycle of spent lithium-ion power batteries in electric vehicles becomes urgent. Herein, we report a one-pot method to recover FePO 4 from spent LiFePO 4 cathode powder through advanced oxidation , which is further successfully used as cathode materials of lithium/sodium-ion batteries (LIBs/SIBs) for the first time. With this facile method, the electrochemical performance can be further improved by simply optimizing FePO 4 with graphene oxide coating. The optimized FePO 4 -graphene oxide (FePO 4 -GO) exhibits enhanced electrochemical performances of 145 mAh g −1 at 0.5 C for LIBs and 75 mAh g −1 at 0.1 C for SIBs , as well as high capacity retention (144 mAh g −1 at 1 C after 300 cycles for LIBs ; 61 mAh g −1 at 1 C after 300 cycles for SIBs). We expect that our current work will provide a facile and green strategy to recover LiFePO 4 material from spent batteries.