Sub-nanometer confinement enables facile condensation of gas electrolyte for low-temperature batteries

Guorui Cai, Yijie Yin, Dawei Xia, Amanda A. Chen, John Holoubek, Jonathan Scharf, Yangyuchen Yang, Ki Hwan Koh, Mingqian Li, Daniel M. Davies, Matthew Mayer, Tae Hee Han, Ying Shirley Meng, Tod A. Pascal and Zheng Chen ()
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Guorui Cai: University of California
Yijie Yin: University of California
Dawei Xia: University of California
Amanda A. Chen: University of California
John Holoubek: University of California
Jonathan Scharf: University of California
Yangyuchen Yang: University of California
Ki Hwan Koh: University of California
Mingqian Li: University of California
Daniel M. Davies: University of California
Matthew Mayer: University of California
Tae Hee Han: Hanyang University
Ying Shirley Meng: University of California
Tod A. Pascal: University of California
Zheng Chen: University of California

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Confining molecules in the nanoscale environment can lead to dramatic changes of their physical and chemical properties, which opens possibilities for new applications. There is a growing interest in liquefied gas electrolytes for electrochemical devices operating at low temperatures due to their low melting point. However, their high vapor pressure still poses potential safety concerns for practical usages. Herein, we report facile capillary condensation of gas electrolyte by strong confinement in sub-nanometer pores of metal-organic framework (MOF). By designing MOF-polymer membranes (MPMs) that present dense and continuous micropore (~0.8 nm) networks, we show significant uptake of hydrofluorocarbon molecules in MOF pores at pressure lower than the bulk counterpart. This unique property enables lithium/fluorinated graphite batteries with MPM-based electrolytes to deliver a significantly higher capacity than those with commercial separator membranes (~500 mAh g−1 vs.

Date: 2021
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DOI: 10.1038/s41467-021-23603-0

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