Non-corrosive asymmetric fluorinated aryl sulfonimide lithium salt for high-temperature and high-voltage lithium metal batteries

Zhi Liu, Shuaishuai Yan, Yang Lu, Qingqing Feng, Xiao Ma, Pan Zhou, Wenhui Hou, Yu Ou, Yuhao Wu, Changjian Li, Jian Feng, Qingbin Cao, Xuwen Peng, Yingchun Xia, Xuan Song, Haiyu Zhou, Hao Liu and Kai Liu ()
Additional contact information
Zhi Liu: Tsinghua University
Shuaishuai Yan: Tsinghua University
Yang Lu: Tsinghua University
Qingqing Feng: Tsinghua University Hefei Institute for Public Safety Research
Xiao Ma: Tsinghua University
Pan Zhou: Tsinghua University
Wenhui Hou: Tsinghua University
Yu Ou: Tsinghua University
Yuhao Wu: Tsinghua University
Changjian Li: Tsinghua University
Jian Feng: Tsinghua University
Qingbin Cao: Tsinghua University
Xuwen Peng: Tsinghua University
Yingchun Xia: Tsinghua University
Xuan Song: Tsinghua University
Haiyu Zhou: Tsinghua University
Hao Liu: Tsinghua University Hefei Institute for Public Safety Research
Kai Liu: Tsinghua University

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract Electrolyte for high-temperature and high-voltage lithium metal batteries face challenges of thermally decomposition of lithium salt and interfacial corrosiveness with aluminum current collectors/cathode materials. Herein, we report a non-corrosive asymmetric lithium salt, i.e., lithium fluorinated aryl sulfonimide (LiFAS). Due to the fluorinated aryl substituent on the bis-sulfonylimide anion, the LiFAS exhibits several desirable physiochemical properties for high-temperature and high-voltage applications, i.e. high thermal stability (decomposition temperature ~388 °C), high voltage tolerance (anodic decomposition potential ~5.5 V vs. Li/Li+), and a high Li+ transference number of 0.62. Moreover, the LiFAS is able to efficiently inhibit the notorious Al-corrosion issue by forming a dense Al(FAS)3/AlF3 passivation layer on the surface of Al current collector. In addition, LiFAS could also promote the formation of inorganic-rich interphases on the cathode and anode. The unique advantages of LiFAS endow Li||NCM811 full cells great cycling stability and capacity retention at harsh cycling conditions (81% after 230 cycles at 60 °C and 4.5 V, 0.5 C charge/1 C discharge). This work inspires molecular engineering strategy for designing functional lithium salts to enhance the cycle life of LMBs under high-temperatures and high-voltages.

Date: 2025
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DOI: 10.1038/s41467-025-64737-9

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