Screening of F-containing electrolyte additives and clarifying their decomposition routes for stable Li metal anodes

Jijiang Liu; Wei Hao; Mingming Fang; Xin Chen; Yongteng Dong; Yuanmao Chen; Zhiyong Wang; Xinyang Yue; Zheng Liang

doi:10.1038/s41467-024-53807-z

Screening of F-containing electrolyte additives and clarifying their decomposition routes for stable Li metal anodes

Nat Commun. 2024 Oct 29;15(1):9356. doi: 10.1038/s41467-024-53807-z.

Authors

Jijiang Liu^#¹, Wei Hao^#^{1

2}, Mingming Fang^#¹, Xin Chen^#^{1

3}, Yongteng Dong¹, Yuanmao Chen¹, Zhiyong Wang¹, Xinyang Yue⁴, Zheng Liang⁵

Affiliations

¹ Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China.
² Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China.
³ Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, CA, USA.
⁴ Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China. [email protected].
⁵ Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China. [email protected].

^# Contributed equally.

Abstract

Constructing a LiF-rich solid electrolyte interphase (SEI) is a feasible strategy for inhibiting lithium (Li) dendrites of Li metal anodes (LMAs). However, selecting appropriate F-containing additives with efficient LiF contribution is still under active research. Herein, a series of fluorinated additives with diverse F/C molar ratios are investigated, and we demonstrate that the hexafluoroglutaric anhydride (F_6-0) holds the best capability to derive the LiF-rich SEI in regular carbonate electrolytes (RCEs). To ameliorate the decomposition kinetics of the F_6-0, LiNO₃ (LNO) as an adjuvant is further introduced in the system. As a result, the reduction efficiency of F_6-0 is increased to 91% under the F_6-0/LNO synergistic effect, enabling the LMA with a uniform LiF-rich SEI in the RCE with merely 4 vol. % F_6-0/LNO (F6L) addition. The LiNi_0.8Co_0.1Mn_0.1O₂||Li-20μm full-cell with the F6L also showcases better cycling and rate performances than the cases with other F-containing additives.

Abstract

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