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A facile way to regenerate FePO4 center dot 2H(2)O precursor from spent lithium iron phosphate cathode powder: Spontaneous precipitation and phase transformation in an acidic medium
Lou, Wen-bo1,2,3; Zhang, Yang2,3; Zhang, Ying2,3; Zheng, Shi-li2,3; Sun, Pei6; Wang, Xiao-jian2,3; Qiao, Shan2,3; Li, Jian-zhong1; Zhang, Yi2,3; Liu, Dong-yan4; Wenzel, Marco5; Weigand, Jan J.5
2021-03-05
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume856Pages:12
Abstract

Recycling the end-of-life lithium-ion batteries including the lithium iron phosphate (LiFePO4) battery has been one of the most important technology areas since electric vehicles are gradually dominating the way of transportation. For the recycling of LiFePO4 batteries, the regeneration of pure iron phosphate dihydrate (FePO4 center dot 2H(2)O) from spent cathode material is essential but difficult. The challenge is how to effectively synthesize battery-grade iron phosphate from the impurity-bearing acid solution by precipitation since the spent cathode powder usually holds various impurities. To avoid the introduction of impurities into the iron phosphate, a one-step spontaneous precipitation and phase transformation mode without acidity adjustment was preferred and studied in this work. The focus of this research included the process of phase transformation from amorphous to crystalline, and its effects on precipitation and the properties of the precipitate. It was interestingly found that there was an induction period for phase transformation from amorphous FePO4 center dot xH(2)O to monoclinic FePO4 center dot 2H(2)O during the precipitation, which was distinctly shortened with the elevated temperature. Phase transformation led to fast increased precipitation efficiency, morphology evolution, and composition change, which benefited the consistency of iron phosphate. Phase transformation could be kinetically described by the JMA equation, with a rate-limiting step of materials diffusion towards the nucleation point and an activation energy of 20.4 kJ/mol. The critical crystal size for transformation was increasing along with the temperature's raising, which was ascribed to the changes in the volume energy and the surface energy. The results in this study have built the feasibility of chemically regenerating FePO4 center dot 2H(2)O precursors from the spent cathode powder by precipitation purification in an acidic medium. (C) 2020 Elsevier B.V. All rights reserved.

KeywordFepo4 Center Dot 2h(2)o Acidic Solution Precipitation Phase Transformation Kinetics
DOI10.1016/j.jallcom.2020.158148
Language英语
WOS KeywordIon Batteries ; Selective Recovery ; Surface-energy ; Fepo4 ; Li ; Carbon ; Lifepo4/c ; Industry ; Capacity ; Kinetics
Funding ProjectKey Deployment Projects of Chinese Academy of Sciences[ZDRW_CN_2020-1] ; Sino-German Cooperation Research Project under the National Natural Science Foundation of China[51761135108] ; German Research Foundation[392417756] ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM-2019-A15]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationKey Deployment Projects of Chinese Academy of Sciences ; Sino-German Cooperation Research Project under the National Natural Science Foundation of China ; German Research Foundation ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences
WOS IDWOS:000610851500032
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/43458
Collection中国科学院过程工程研究所
Corresponding AuthorZhang, Ying; Zheng, Shi-li
Affiliation1.Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Innovat Acad Green Manufacture, Beijing 100190, Peoples R China
4.Shenyang Univ, Normal Coll, Shenyang 110044, Peoples R China
5.Tech Univ Dresden, Fac Chem & Food Chem, D-01062 Dresden, Germany
6.Univ Utah, Mat Sci & Engn, Salt Lake City, UT 84112 USA
Recommended Citation
GB/T 7714
Lou, Wen-bo,Zhang, Yang,Zhang, Ying,et al. A facile way to regenerate FePO4 center dot 2H(2)O precursor from spent lithium iron phosphate cathode powder: Spontaneous precipitation and phase transformation in an acidic medium[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2021,856:12.
APA Lou, Wen-bo.,Zhang, Yang.,Zhang, Ying.,Zheng, Shi-li.,Sun, Pei.,...&Weigand, Jan J..(2021).A facile way to regenerate FePO4 center dot 2H(2)O precursor from spent lithium iron phosphate cathode powder: Spontaneous precipitation and phase transformation in an acidic medium.JOURNAL OF ALLOYS AND COMPOUNDS,856,12.
MLA Lou, Wen-bo,et al."A facile way to regenerate FePO4 center dot 2H(2)O precursor from spent lithium iron phosphate cathode powder: Spontaneous precipitation and phase transformation in an acidic medium".JOURNAL OF ALLOYS AND COMPOUNDS 856(2021):12.
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