Journal
ELECTROCHIMICA ACTA
Volume 330, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135323
Keywords
Lithium-ion battery; Used LiFePO4; Regeneration
Categories
Funding
- National Natural Science Foundation of China [U1601214]
- National Natural Science Foundation of Guangdong Province [U1601214]
- Scientific and Technological Plan of Guangdong Province [2018B050502010, 2018A050506078, 2017B090901027]
- Natural Science Foundation of Guangdong Province [2017A030310166]
- Project of Blue Fire Plan [CXZJHZ201708, CXZJHZ201709]
- Innovation Project of Graduate School of South China Normal University [2018LKXM020]
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Currently extensive attentions on recycling application from scrapped LiFePO4 power batteries of electric vehicles is attracted to the researchers. Owing to its stable olivine crystal structure and expensive preparation process relative to other cathode materials, the re-synthesis of LiFePO4 from spent batteries becomes an economical and convenient way. Herein, we combine the mechanical separation and high-temperature pyrolysis to regenerate the performance of used LiFePO4 cathode materials from retired electric vehicles. Spent LiFePO4 cathode material is first successfully regenerated through Li/Fe/P elements compensation and structure reshaping via heat treatment method. The results show that when the content of Li/Fe/P elements in the used LiFePO4 material is restored to the initial conditions, the surface and particle sizes of the material are recovered to smooth and small, respectively. From the crystal structure, the crystal distortion of the used LiFePO4 material is also repaired, indicating by the restored interplanar spacing of the (111) plane and the improved crystallinity. With the successful repair of microstructures and components, the electrochemical performance of the repaired LiFePO4 is reverted, such as long cycle and rate performance, when compared with the used LiFePO4. (C) 2019 Elsevier Ltd. All rights reserved.
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