We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Multifunctional solvent molecule design enables high-voltage Li-ion batteries.
- Authors
Zhang, Junbo; Zhang, Haikuo; Weng, Suting; Li, Ruhong; Lu, Di; Deng, Tao; Zhang, Shuoqing; Lv, Ling; Qi, Jiacheng; Xiao, Xuezhang; Fan, Liwu; Geng, Shujiang; Wang, Fuhui; Chen, Lixin; Noked, Malachi; Wang, Xuefeng; Fan, Xiulin
- 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. The parasitic reactions at the electrolyte/electrode interfaces inhibit the increase of the charging cut-off voltage and the improvement of energy density. Herein, the authors design multifunctional solvent molecules and propose a practical design principle to stabilize the electrolyte/electrode interfaces for high-voltage Li ion batteries.
- Subjects
LITHIUM-ion batteries; ENERGY density; SOLID electrolytes; FLUOROETHYLENE; SOLVENTS; ELECTROLYTES; MOLECULES
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-37999-4