Insight into the interaction between Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode and BF4--introducing electrolyte at 4.5 V high voltage

能源化学(英文版) ›› 2019, Vol. 39 ›› Issue (12): 235-243.

Insight into the interaction between Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ cathode and BF₄^--introducing electrolyte at 4.5 V high voltage

Guangyuan Lan, Hebing Zhou, Lidan Xing, Jiawei Chen, Zifei Li, Rude Guo, Yanxia Che, Weishan Li

National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs, Engineering Research Center of MTEES(Ministry of Education), Research Center of BMET(Guangdong Province), Key Laboratory of ETESPG(GHEI), School of Chemistry and Environment, South China Normal University, Guangzhou 510006, Guangdong, China

收稿日期:2018-12-28 修回日期:2019-03-25 出版日期:2019-12-15 发布日期:2020-12-18
通讯作者: Lidan Xing, xingld@scnu.edu.cn
基金资助:
This work is supported by the National Natural Science Foundation of China (21573080), the Guangdong Program for Support of Top-notch Young Professionals (2015TQ01N870) and Distinguished Young Scholar (2017B030306013), and the Science and Technology Planning Project of Guangdong Province (Grant no. 2017B090901020).

Insight into the interaction between Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ cathode and BF₄^--introducing electrolyte at 4.5 V high voltage

Guangyuan Lan, Hebing Zhou, Lidan Xing, Jiawei Chen, Zifei Li, Rude Guo, Yanxia Che, Weishan Li

National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs, Engineering Research Center of MTEES(Ministry of Education), Research Center of BMET(Guangdong Province), Key Laboratory of ETESPG(GHEI), School of Chemistry and Environment, South China Normal University, Guangzhou 510006, Guangdong, China

Received:2018-12-28 Revised:2019-03-25 Online:2019-12-15 Published:2020-12-18
Contact: Lidan Xing, xingld@scnu.edu.cn
Supported by:
This work is supported by the National Natural Science Foundation of China (21573080), the Guangdong Program for Support of Top-notch Young Professionals (2015TQ01N870) and Distinguished Young Scholar (2017B030306013), and the Science and Technology Planning Project of Guangdong Province (Grant no. 2017B090901020).

摘要/Abstract

摘要： Owing to the high specific capacity and high voltage, Ni-rich (LiNi_0.8Co_0.1Mn_0.1O₂, LNCM811) cathode has been considered as one of the most promising candidate cathode materials for next generation lithium ion batteries, whereas severe capacity fading greatly hinders its practical application. Notably, the compatibility of Ni-rich materials with LiBF₄-containing electrolyte has not yet been realized. Herein, 1 M LiPF₆-based electrolyte with introducing 2 M LiBF₄ is proposed to dramatically improve the cyclic stability of high voltage LNCM811/Li half-cell. Addition of high concentrated LiBF₄ improves the moisture stability of electrolyte, which hinders the generation of harmful by-product HF, resulting in improved interfacial stability of LNCM811. Lithium plating/stripping reaction of Li/Li symmetric cell confirms that the enhanced cyclic stability is ascribed to the improved interfacial stability of LNCM811 instead of lithium electrode. Morphology and composition characterization results reveal that LiBF₄ participates in the CEI film-forming reaction, resulting in suppressed oxidation of electrolyte and interfacial structural destruction of LNCM811.

关键词: LiNi_0.8Co_0.1Mn_0.1O₂, 4.5 V high voltage, Interfacial stability, LiBF₄ co-salt, CEI film

Abstract: Owing to the high specific capacity and high voltage, Ni-rich (LiNi_0.8Co_0.1Mn_0.1O₂, LNCM811) cathode has been considered as one of the most promising candidate cathode materials for next generation lithium ion batteries, whereas severe capacity fading greatly hinders its practical application. Notably, the compatibility of Ni-rich materials with LiBF₄-containing electrolyte has not yet been realized. Herein, 1 M LiPF₆-based electrolyte with introducing 2 M LiBF₄ is proposed to dramatically improve the cyclic stability of high voltage LNCM811/Li half-cell. Addition of high concentrated LiBF₄ improves the moisture stability of electrolyte, which hinders the generation of harmful by-product HF, resulting in improved interfacial stability of LNCM811. Lithium plating/stripping reaction of Li/Li symmetric cell confirms that the enhanced cyclic stability is ascribed to the improved interfacial stability of LNCM811 instead of lithium electrode. Morphology and composition characterization results reveal that LiBF₄ participates in the CEI film-forming reaction, resulting in suppressed oxidation of electrolyte and interfacial structural destruction of LNCM811.

Key words: LiNi_0.8Co_0.1Mn_0.1O₂, 4.5 V high voltage, Interfacial stability, LiBF₄ co-salt, CEI film

Guangyuan Lan, Hebing Zhou, Lidan Xing, Jiawei Chen, Zifei Li, Rude Guo, Yanxia Che, Weishan Li. Insight into the interaction between Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ cathode and BF₄^--introducing electrolyte at 4.5 V high voltage[J]. 能源化学(英文版), 2019, 39(12): 235-243.

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Insight into the interaction between Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ cathode and BF₄^--introducing electrolyte at 4.5 V high voltage

Insight into the interaction between Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ cathode and BF₄^--introducing electrolyte at 4.5 V high voltage

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