期刊
SMALL METHODS
卷 5, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202100672
关键词
cathode materials; non-destructive materials; regeneration technology; spent LIBs
资金
- National Natural Science Foundation of China [51972030, 51772030, 52102207]
- S&T Major Project of Inner Mongolia Autonomous Region in China [2020ZD0018]
- Beijing Outstanding Young Scientists Program [BJJWZYJH01201910007023]
- Guangdong Key Laboratory of Battery Safety [2019B121203008]
- China Postdoctoral Science Foundation [2021M690377]
A practical solution is proposed to recover and increase the stability of the layered structure in spent lithium-ion batteries through high-temperature supplementation and metal ion doping. The regenerated products exhibit better electrochemical performance with high capacity and capacity retention.
Effective and scalable recycling of spent lithium-ion batteries is an urgent need to address the environmental pollution and resource consumption caused by improper disposal. Herein, a practical solution is presented to recover and increase the stability of the layered structure from scrap Li1-xCoO2 via high-temperature supplementation of Li and Mg doping, without an extra synthesis step or cost. All the regenerated products exhibit better electrochemical performance compared with the commercial cathode material. Within the voltage window of 3.0-4.6 V, 5% Mg-recovery LiCoO2 (LMCO) exhibits a high discharge capacity of 202.9 mA h g(-1) at 0.2 C, and 3% Mg-recovery LiCoO2 shows enhanced capacity retention of 99.5% at 0.2 C after 50 cycles and maintains 96.8% at 1 C after 100 cycles. This is because high-temperature supplementing metal ions is beneficial for eliminating the cracks and nano-impurity particles on the surface of spent materials, thereby restoring the layered structure and electrochemical performance. The excellent electrochemical performances of Mg-recovery LiCoO2 are attributed to Mg ions doping, which can inhibit the release of lattice oxygen and stabilize the surface structure. This process maximizes the utilization of the spent materials and provides a novel perspective for the non-constructive recovery of spent materials.
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