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Yang et al. Energy Mater 2023;3:300029 Energy Materials
DOI: 10.20517/energymater.2023.10

Article Open Access

Understanding of working mechanism of lithium

difluoro(oxalato) borate in Li||NCM85 battery with
enhanced cyclic stability

2
5
4
1,#
3
1
Xuerui Yang 1,2,# , Yaxin Huang , Jianhui Li , Weilin Huang , Wen Yang , Changquan Wu , Shijun Tang ,
5,*
2,*
5
Fucheng Ren , Zhengliang Gong , Naigen Zhou , Yong Yang 1,5,*
1
College of Chemistry and Chemical Engineering & Tan Kah Kee Innovation Laboratory (IKKEM), Xiamen University, Xiamen
361102, Fujian, China.
2
School of Physics and Materials Science, Nanchang University, Nanchang 330031, Jiangxi, China.
3
School of Chemistry, South China Normal University, Guangzhou 510006, Guangdong, China.
4
College of Chemistry and Chemical Engineering, Jiangxi Province Engineering Research Center of Ecological Chemical Industry,
Jiujiang University, Jiujiang 332005, Jiangxi, China.
5
School of Energy, Xiamen University, Xiamen 361102, Fujian, China.
#
Authors contributed equally.
*Correspondence to: Prof. Zhengliang Gong, School of Energy, Xiamen University, Xiamen 361102, Fujian, China. E-mail:
zlgong@xmu.edu.cn; Prof. Naigen Zhou, School of Physics and Materials Science, Nanchang University, Nanchang 330031,
Jiangxi, China. E-mail: ngzhou@ncu.edu.cn; Prof. Yong Yang, State Key Laboratory of Physical Chemistry of Solid Surfaces,
Department of Chemistry and College of Chemistry and Chemical Engineering & Tan Kah Kee Innovation Laboratory (IKKEM),
Xiamen University, Xiamen 361102, Fujian, China. E-mail: yyang@xmu.edu.cn
How to cite this article: Yang X, Huang Y, Li J, Huang W, Yang W, Wu C, Tang S, Ren F, Gong Z, Zhou N, Yang Y. Understanding
of working mechanism of lithium difluoro(oxalato) borate in Li||NCM85 battery with enhanced cyclic stability. Energy Mater
2023;3:300029. https://dx.doi.org/10.20517/energymater.2023.10
Received: 15 Feb 2023 First Decision: 12 Apr 2023 Revised: 10 May 2023 Accepted: 1 Jun 2023 Published: 3 Jul 2023
Academic Editors: Elie Paillard, Xiongwei Wu Copy Editor: Fangling Lan Production Editor: Fangling Lan
Abstract
Despite the significant advances achieved in recent years, the development of efficient electrolyte additives to
mitigate the performance degradation during long-term cycling of high-energy density lithium||nickel-rich (Li||Ni-
rich) batteries remains a significant challenge. To achieve a rational design of electrolytes and avoid unnecessary
waste of resources due to trial and error, it is crucial to have a comprehensive understanding of the underlying
mechanism of key electrolyte components, including salts, solvents, and additives. Herein, we present the
utilization of lithium difluoro(oxalate) borate (B) (LiDFOB), a B-containing lithium salt, as a functional additive for
Li||LiNi Co Mn O (NCM85) batteries, and comprehensively investigate its mechanism of action towards
0.85 0.1 0.05 2
enhancing the stability of both anode and cathode interfaces. The preferential reduction and oxidation
decomposition of DFOB leads to the formation of a robust and highly electronically insulating boron-rich interfacial
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