Enhancing lithium-metal battery longevity through minimized coordinating diluent

Guo-Xing Li, Volodymyr Koverga, Au Nguyen, Rong Kou, Musawenkosi Ncube, Heng Jiang, Ke Wang, Meng Liao, Hanzeng Guo, Jun Chen, Naveen Dandu, Anh T. Ngo () and Donghai Wang ()
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Guo-Xing Li: The Pennsylvania State University
Volodymyr Koverga: University of Illinois Chicago
Au Nguyen: The Pennsylvania State University
Rong Kou: The Pennsylvania State University
Musawenkosi Ncube: University of Illinois Chicago
Heng Jiang: The Pennsylvania State University
Ke Wang: The Pennsylvania State University
Meng Liao: The Pennsylvania State University
Hanzeng Guo: University of Illinois Chicago
Jun Chen: University of Illinois Chicago
Naveen Dandu: University of Illinois Chicago
Anh T. Ngo: University of Illinois Chicago
Donghai Wang: The Pennsylvania State University

Nature Energy, 2024, vol. 9, issue 7, 817-827

Abstract: Abstract Extending the lifespan of lithium (Li) batteries involves managing reactions at the Li anode and stabilizing the solid–electrolyte interphase (SEI) through strategic regulation of the electrolyte composition. Here we synthesized a fluorinated cyclic ether with minimized Li-ion coordination capability and enhanced electrochemical stability. We demonstrated its crucial role in manipulating the SEI formation process by differentiating the contribution of dual anions to the SEI layer. Consequently, a bilayer SEI is formed, featuring a Li2O-rich inner layer and a LiF-rich outer layer, enabling improved stability and reversibility of Li-metal anodes. The developed electrolyte shows remarkable improvement in calendar life and cycling stability of Li (50 µm)||NMC811 (4 mAh cm−2) cells, maintaining 80% capacity after 568 and 218 cycles at room temperature and 60 °C, respectively. Furthermore, our 410 Wh kg−1 prototype pouch cells demonstrate 80% capacity retention for 470 cycles.

Date: 2024
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DOI: 10.1038/s41560-024-01519-5

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