The Prilling and Cocoating Collaborative Strategy to Construct High Performance of Regeneration LiFePO₄ Materials

Abstract

There have been a massive amount of spent LiFePO 4 batteries produced in recent years because LiFePO 4 is widely used in energy storage and electric vehicles, which need to be recycled urgently. However, considering the manufacturing cost of LiFePO 4, traditional metallurgical technology is not economical to recover spent LiFePO 4 . Moreover, the performance of directly regenerated materials is inferior to that of commercial materials. It hinders the development of recycled cathode materials for lithium-ion batteries. Herein, spent LiFePO 4 with severely degraded is regenerated by preoxidation and prilling combine cocoating strategy. The preoxidation fully decomposed the binder and residual carbon. The subsequent regeneration process synthesized spherical LiFePO 4 with carbon and Li 3 PO 4 cocoating layer, whose electrochemical performance is comparable to commercial LiFePO 4 . This method dramatically improves the rate and low temperature electrochemical performance of the regenerated LiFePO 4, which provides a new scheme for the reuse of recycled LFP in lithium-ion batteries.