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, Xiulin Fan

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number2211
JournalNature Communications
Issue number1
StatePublished - Dec 2023

Bibliographical note

Funding Information:
X.F. acknowledges the support of National Natural Science Foundation of China (Grant No. 22072134, 22161142017 and U21A2081), Natural Science Foundation of Zhejiang Province (LZ21B030002), the Fundamental Research Funds for the Zhejiang Provincial Universities (2021XZZX010), the Fundamental Research Funds for the Central Universities (2021FZZX001-09), and “Hundred Talents Program” of Zhejiang University. X.W. acknowledges the support of National Natural Science Foundation of China (Grant No. 22005334 and 52172257) and National Key Research and Development Program of China (Grant No. 2022YFB2502200). M.N. acknowledges the support of Israel Science Foundation grant # 3494/21.

Publisher Copyright:
© 2023, The Author(s).


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