Direct regeneration of spent LiFePO4 cathode materials assisted with a bifunctional organic lithium salt

Lu Yang; Baichao Zhang; Shuo Chen; Qing Pan; Wenyuan Li; Chaolun Gan; Wentao Deng; Guoqiang Zou; Hongshuai Hou; Li Yang; Xiaobo Ji

doi:10.1039/D4CC02962C

Direct regeneration of spent LiFePO₄ cathode materials assisted with a bifunctional organic lithium salt†

Lu Yang,^a Baichao Zhang,^a Shuo Chen,^a Qing Pan,^a Wenyuan Li,^a Chaolun Gan,^b Wentao Deng,^a Guoqiang Zou,

^a Hongshuai Hou,

^a Li Yang*^c and Xiaobo Ji

*^a

Author affiliations

* Corresponding authors

^a College of Chemistry and Chemical Engineering, Central South University, Changsha, China
E-mail: xji@csu.edu.cn

^b Zhangjiagang Guotai Huarong New Chemical Materials Co., Ltd, Zhangjiagang, China

^c School of Science, Hunan University of Technology and Business, Changsha, China
E-mail: liyang0926@hutb.edu.cn

Abstract

Direct regeneration is an effective strategy of spent lithium iron phosphate (S-LFP), with the principal aspect being the selection of the lithium source and reductant. Here, assisted with a thermodynamically favourable reaction involving a bifunctional organic lithium salt (lithium citrate), the single-step regeneration of S-LFP is successfully achieved. The structure and composition of the regenerated LFP are significantly restored, demonstrating excellent electrochemical performance (142.7 mA h g⁻¹) with no degradation after 200 cycles.

Chemical Communications

Direct regeneration of spent LiFePO₄ cathode materials assisted with a bifunctional organic lithium salt†

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Direct regeneration of spent LiFePO₄ cathode materials assisted with a bifunctional organic lithium salt

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Chemical Communications