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Title: Valence Effects of Fe Impurity for Recovered LiNi0.6Co0.2Mn0.2O2 Cathode Materials

Abstract

Iron impurities are generally included in the obtained leaching liquor solution during the hydrometallurgical recycling method of spent lithium-ion batteries (LIBs) due to the usage of iron in battery casings and machinery parts of recycling equipment, which would definitely affect the physical and electrochemical features of the recovered active materials. In this paper, the effects of iron impurity with different valence states (Fe2+ and Fe3+) and gradient concentrations (0.2, 1.0, and 5.0 at. %) for the obtained LiNi0.6Co0.2Mn0.2O2 (NCM622) cathodes are fully studied. It is found that Fe3+ impurity could easily lower the tap density and average size of NCM622 particles and even introduce some impurity phases in the NCM622 structure at high concentration (5.0 at. %), leading to much lower specific capacity, worse rate capability, and cycling performance of the Fe3+-based NCM622 cathode. On contrast, with certain concentrations of Fe2+ impurity (0.2 and 1.0 at. %), the NCM622 cathode material exhibits comparable and much better electrochemical properties compared with the virgin NCM622 materials. Based on these results, the valence of Fe impurity should be considered and controlled as well as its concentration during the recycling process design for spent LIBs.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [2];  [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Worcester Polytechnic Inst., MA (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
OSTI Identifier:
1840965
Alternate Identifier(s):
OSTI ID: 1840909
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Energy Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 9; Journal ID: ISSN 2574-0962
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; recovered LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode materials; iron impurities; spent LIB recycling process; cation mixing degree; XPS depth profiling technique; impurities; precursors; materials; electrodes; ions

Citation Formats

Zhang, Ruihan, Zheng, Yadong, Vanaphuti, Panawan, Liu, Yangtao, Fu, Jinzhao, Yao, Zeyi, Ma, Xiaotu, Chen, Mengyuan, Yang, Zhenzhen, Lin, Yulin, Wen, Jianguo, and Wang, Yan. Valence Effects of Fe Impurity for Recovered LiNi0.6Co0.2Mn0.2O2 Cathode Materials. United States: N. p., 2021. Web. doi:10.1021/acsaem.1c02281.
Zhang, Ruihan, Zheng, Yadong, Vanaphuti, Panawan, Liu, Yangtao, Fu, Jinzhao, Yao, Zeyi, Ma, Xiaotu, Chen, Mengyuan, Yang, Zhenzhen, Lin, Yulin, Wen, Jianguo, & Wang, Yan. Valence Effects of Fe Impurity for Recovered LiNi0.6Co0.2Mn0.2O2 Cathode Materials. United States. https://doi.org/10.1021/acsaem.1c02281
Zhang, Ruihan, Zheng, Yadong, Vanaphuti, Panawan, Liu, Yangtao, Fu, Jinzhao, Yao, Zeyi, Ma, Xiaotu, Chen, Mengyuan, Yang, Zhenzhen, Lin, Yulin, Wen, Jianguo, and Wang, Yan. Thu . "Valence Effects of Fe Impurity for Recovered LiNi0.6Co0.2Mn0.2O2 Cathode Materials". United States. https://doi.org/10.1021/acsaem.1c02281. https://www.osti.gov/servlets/purl/1840965.
@article{osti_1840965,
title = {Valence Effects of Fe Impurity for Recovered LiNi0.6Co0.2Mn0.2O2 Cathode Materials},
author = {Zhang, Ruihan and Zheng, Yadong and Vanaphuti, Panawan and Liu, Yangtao and Fu, Jinzhao and Yao, Zeyi and Ma, Xiaotu and Chen, Mengyuan and Yang, Zhenzhen and Lin, Yulin and Wen, Jianguo and Wang, Yan},
abstractNote = {Iron impurities are generally included in the obtained leaching liquor solution during the hydrometallurgical recycling method of spent lithium-ion batteries (LIBs) due to the usage of iron in battery casings and machinery parts of recycling equipment, which would definitely affect the physical and electrochemical features of the recovered active materials. In this paper, the effects of iron impurity with different valence states (Fe2+ and Fe3+) and gradient concentrations (0.2, 1.0, and 5.0 at. %) for the obtained LiNi0.6Co0.2Mn0.2O2 (NCM622) cathodes are fully studied. It is found that Fe3+ impurity could easily lower the tap density and average size of NCM622 particles and even introduce some impurity phases in the NCM622 structure at high concentration (5.0 at. %), leading to much lower specific capacity, worse rate capability, and cycling performance of the Fe3+-based NCM622 cathode. On contrast, with certain concentrations of Fe2+ impurity (0.2 and 1.0 at. %), the NCM622 cathode material exhibits comparable and much better electrochemical properties compared with the virgin NCM622 materials. Based on these results, the valence of Fe impurity should be considered and controlled as well as its concentration during the recycling process design for spent LIBs.},
doi = {10.1021/acsaem.1c02281},
journal = {ACS Applied Energy Materials},
number = 9,
volume = 4,
place = {United States},
year = {Thu Sep 16 00:00:00 EDT 2021},
month = {Thu Sep 16 00:00:00 EDT 2021}
}

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