posted on 2023-09-01, 20:29authored byXiangnan Li, Ming Ge, Qibin Zhou, Zhangchen Gao, Yuantao Cui, Mengdan Zhang, Xinyu Tang, Huishuang Zhang, Zhenpu Shi, Yanhong Yin, Shuting Yang
Efficient recycling of spent lithium-ion batteries (LIBs)
is significant
for solving environmental problems and promoting resource conservation.
Economical recycling of LiFePO4 (LFP) batteries is extremely
challenging due to the inexpensive production of LFP. Herein, we report
a preoxidation combine with cation doping regeneration strategy to
regenerate spent LiFePO4 (SLFP) with severely deteriorated.
The binder, conductive agent, and residual carbon in SLFP are effectively
removed through preoxidation treatment, which lays the foundation
for the uniform and stable regeneration of LFP. Mg2+ doping
is adopted to promote the diffusion efficiency of lithium ions, reduces
the charge-transfer impedance, and further improves the electrochemical
performance of the regenerated LFP. The discharge capacity of SLFP
with severe deterioration recovers successfully from 43.2 to 136.9
mA h g–1 at 0.5 C. Compared with traditional methods,
this technology is simple, economical, and environment-friendly. It
provided an efficient way for recycling SLFP materials.