Multifunctional solvent molecule design enables high-voltage Li-ion batteries

Junbo Zhang, Haikuo Zhang, Suting Weng, Ruhong Li, Di Lu, Tao Deng, Shuoqing Zhang, Ling Lv, Jiacheng Qi, Xuezhang Xiao, Liwu Fan, Shujiang Geng, Fuhui Wang, Lixin Chen, Malachi Noked (), Xuefeng Wang () and Xiulin Fan ()
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Junbo Zhang: Zhejiang University
Haikuo Zhang: Zhejiang University
Suting Weng: Chinese Academy of Sciences
Ruhong Li: Zhejiang University
Di Lu: Zhejiang University
Tao Deng: University of Maryland
Shuoqing Zhang: Zhejiang University
Ling Lv: Zhejiang University
Jiacheng Qi: Zhejiang University
Xuezhang Xiao: Zhejiang University
Liwu Fan: Zhejiang University
Shujiang Geng: Northeastern University
Fuhui Wang: Northeastern University
Lixin Chen: Zhejiang University
Malachi Noked: Bar-Ilan University
Xuefeng Wang: Chinese Academy of Sciences
Xiulin Fan: Zhejiang University

Nature Communications, 2023, vol. 14, issue 1, 1-14

Abstract: Abstract Elevating the charging cut-off voltage is one of the efficient approaches to boost the energy density of Li-ion batteries (LIBs). However, this method is limited by the occurrence of severe parasitic reactions at the electrolyte/electrode interfaces. Herein, to address this issue, we design a non-flammable fluorinated sulfonate electrolyte by multifunctional solvent molecule design, which enables the formation of an inorganic-rich cathode electrolyte interphase (CEI) on high-voltage cathodes and a hybrid organic/inorganic solid electrolyte interphase (SEI) on the graphite anode. The electrolyte, consisting of 1.9 M LiFSI in a 1:2 v/v mixture of 2,2,2-trifluoroethyl trifluoromethanesulfonate and 2,2,2-trifluoroethyl methanesulfonate, endows 4.55 V-charged graphite||LiCoO2 and 4.6 V-charged graphite||NCM811 batteries with capacity retentions of 89% over 5329 cycles and 85% over 2002 cycles, respectively, thus resulting in energy density increases of 33% and 16% compared to those charged to 4.3 V. This work demonstrates a practical strategy for upgrading the commercial LIBs.

Date: 2023
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DOI: 10.1038/s41467-023-37999-4

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