A stable quasi-solid electrolyte improves the safe operation of highly efficient lithium-metal pouch cells in harsh environments

Zhi Chang, Huijun Yang, Xingyu Zhu, Ping He and Haoshen Zhou ()
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Zhi Chang: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
Huijun Yang: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
Xingyu Zhu: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
Ping He: Center of Energy Storage Materials & Technology, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Haoshen Zhou: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract Nanoconfined/sub-nanoconfined solvent molecules tend to undergo dramatic changes in their properties and behaviours. In this work, we find that unlike typical bulk liquid electrolytes, electrolytes confined in a sub-nanoscale environment (inside channels of a 6.5 Å metal-organic framework, defined as a quasi-solid electrolyte) exhibits unusual properties and behaviours: higher boiling points, highly aggregated configurations, decent lithium-ion conductivities, extended electrochemical voltage windows (approximately 5.4 volts versus Li/Li+) and nonflammability at high temperatures. We incorporate this interesting electrolyte into lithium-metal batteries (LMBs) and find that LMBs cycled in the quasi-solid electrolyte demonstrate an electrolyte interphase-free (CEI-free) cathode and dendrite-free Li-metal surface. Moreover, high-voltage LiNi0.8Co0.1Mn0.1O2//Li (NCM-811//Li with a high NCM-811 mass loading of 20 mg cm−2) pouch cells assemble with the quasi-solid electrolyte deliver highly stable electrochemical performances even at a high working temperature of 90 °C (171 mAh g−1 after 300 cycles, 89% capacity retention; 164 mAh g−1 after 100 cycles even after being damaged). This strategy for fabricating nonflammable and ultrastable quasi-solid electrolytes is promising for the development of safe and high-energy-density LIBs/LMBs for powering electronic devices under various practical working conditions.

Date: 2022
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DOI: 10.1038/s41467-022-29118-6

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