posted on 2024-01-22, 13:43authored byXiangnan Li, Mingyang Wang, Qibin Zhou, Ming Ge, Mengdan Zhang, Wenfeng Liu, Zhenpu Shi, Hongyun Yue, Huishuang Zhang, Yanhong Yin, Shu-Ting Yang
There have been a massive amount of spent LiFePO4 batteries
produced in recent years because LiFePO4 is widely used
in energy storage and electric vehicles, which need to be recycled
urgently. However, considering the manufacturing cost of LiFePO4, traditional metallurgical technology is not economical to
recover spent LiFePO4. 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 LiFePO4 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 LiFePO4 with carbon and Li3PO4 cocoating layer,
whose electrochemical performance is comparable to commercial LiFePO4. This method dramatically improves the rate and low temperature
electrochemical performance of the regenerated LiFePO4,
which provides a new scheme for the reuse of recycled LFP in lithium-ion
batteries.