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Formation of LiF‐rich Cathode‐Electrolyte Interphase by Electrolyte Reduction

The capacity of transition metal oxide cathode for Li‐ion batteries can be further enhanced by increasing the charging potential. However, these high voltage cathodes suffer from fast capacity decay because the large volume change of cathode breaks the active materials and cathode‐electrolyte interp...

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Autores principales: Bai, Panxing, Ji, Xiao, Zhang, Jiaxun, Zhang, Weiran, Hou, Singyuk, Su, Hai, Li, Mengjie, Deng, Tao, Cao, Longsheng, Liu, Sufu, He, Xinzi, Xu, Yunhua, Wang, Chunsheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9322663/
https://www.ncbi.nlm.nih.gov/pubmed/35395115
http://dx.doi.org/10.1002/anie.202202731
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author Bai, Panxing
Ji, Xiao
Zhang, Jiaxun
Zhang, Weiran
Hou, Singyuk
Su, Hai
Li, Mengjie
Deng, Tao
Cao, Longsheng
Liu, Sufu
He, Xinzi
Xu, Yunhua
Wang, Chunsheng
author_facet Bai, Panxing
Ji, Xiao
Zhang, Jiaxun
Zhang, Weiran
Hou, Singyuk
Su, Hai
Li, Mengjie
Deng, Tao
Cao, Longsheng
Liu, Sufu
He, Xinzi
Xu, Yunhua
Wang, Chunsheng
author_sort Bai, Panxing
collection PubMed
description The capacity of transition metal oxide cathode for Li‐ion batteries can be further enhanced by increasing the charging potential. However, these high voltage cathodes suffer from fast capacity decay because the large volume change of cathode breaks the active materials and cathode‐electrolyte interphase (CEI), resulting in electrolyte penetration into broken active materials and continuous side reactions between cathode and electrolytes. Herein, a robust LiF‐rich CEI was formed by potentiostatic reduction of fluorinated electrolyte at a low potential of 1.7 V. By taking LiCoO(2) as a model cathode, we demonstrate that the LiF‐rich CEI maintains the structural integrity and suppresses electrolyte penetration at a high cut‐off potential of 4.6 V. The LiCoO(2) with LiF‐rich CEI exhibited a capacity of 198 mAh g(−1) at 0.5C and an enhanced capacity retention of 63.5 % over 400 cycles as compared to the LiF‐free LiCoO(2) with only 17.4 % of capacity retention.
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spelling pubmed-93226632022-07-30 Formation of LiF‐rich Cathode‐Electrolyte Interphase by Electrolyte Reduction Bai, Panxing Ji, Xiao Zhang, Jiaxun Zhang, Weiran Hou, Singyuk Su, Hai Li, Mengjie Deng, Tao Cao, Longsheng Liu, Sufu He, Xinzi Xu, Yunhua Wang, Chunsheng Angew Chem Int Ed Engl Research Articles The capacity of transition metal oxide cathode for Li‐ion batteries can be further enhanced by increasing the charging potential. However, these high voltage cathodes suffer from fast capacity decay because the large volume change of cathode breaks the active materials and cathode‐electrolyte interphase (CEI), resulting in electrolyte penetration into broken active materials and continuous side reactions between cathode and electrolytes. Herein, a robust LiF‐rich CEI was formed by potentiostatic reduction of fluorinated electrolyte at a low potential of 1.7 V. By taking LiCoO(2) as a model cathode, we demonstrate that the LiF‐rich CEI maintains the structural integrity and suppresses electrolyte penetration at a high cut‐off potential of 4.6 V. The LiCoO(2) with LiF‐rich CEI exhibited a capacity of 198 mAh g(−1) at 0.5C and an enhanced capacity retention of 63.5 % over 400 cycles as compared to the LiF‐free LiCoO(2) with only 17.4 % of capacity retention. John Wiley and Sons Inc. 2022-04-28 2022-06-27 /pmc/articles/PMC9322663/ /pubmed/35395115 http://dx.doi.org/10.1002/anie.202202731 Text en © 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Articles
Bai, Panxing
Ji, Xiao
Zhang, Jiaxun
Zhang, Weiran
Hou, Singyuk
Su, Hai
Li, Mengjie
Deng, Tao
Cao, Longsheng
Liu, Sufu
He, Xinzi
Xu, Yunhua
Wang, Chunsheng
Formation of LiF‐rich Cathode‐Electrolyte Interphase by Electrolyte Reduction
title Formation of LiF‐rich Cathode‐Electrolyte Interphase by Electrolyte Reduction
title_full Formation of LiF‐rich Cathode‐Electrolyte Interphase by Electrolyte Reduction
title_fullStr Formation of LiF‐rich Cathode‐Electrolyte Interphase by Electrolyte Reduction
title_full_unstemmed Formation of LiF‐rich Cathode‐Electrolyte Interphase by Electrolyte Reduction
title_short Formation of LiF‐rich Cathode‐Electrolyte Interphase by Electrolyte Reduction
title_sort formation of lif‐rich cathode‐electrolyte interphase by electrolyte reduction
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9322663/
https://www.ncbi.nlm.nih.gov/pubmed/35395115
http://dx.doi.org/10.1002/anie.202202731
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