High Li-Ion Conductivity in Li{N(SO<sub>2</sub>F)<sub>2</sub>}(NCCH<sub>2</sub>CH<sub>2</sub>CN)<sub>2</sub> Molecular Crystal.
basic_science · Level V
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- Record sourced from PubMed, PMID 33111521.
- Also identified by DOI 10.1021/acs.nanolett.0c03313.
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Abstract
There is an urgent need to develop solid electrolytes based on organic molecular crystals for application in energy devices. However, the quest for molecular crystals with high Li-ion conductivity is still in its infancy. In this study, the high Li-ion conductivity of a Li{N(SO<sub>2</sub>F)<sub>2</sub>}(NCCH<sub>2</sub>CH<sub>2</sub>CN)<sub>2</sub> molecular crystal is reported. The crystal shows a Li-ion conductivity of 1 × 10<sup>-4</sup> S cm<sup>-1</sup> at 30 °C and 1 × 10<sup>-5</sup> S cm<sup>-1</sup> at -20 °C, with a low activation energy of 28 kJ mol<sup>-1</sup>. The conductivity at 30 °C is one of the highest values attainable by molecular crystals, whereas that at -20 °C is approximately 2 orders of magnitude higher than previously reported values. Furthermore, the all-solid-state Li-battery fabricated using this solid electrolyte demonstrates stable cycling, thereby maintaining 90% of the initial capacity after 100 charge-discharge cycles. The finding of high Li-ion conductivity in molecular crystals paves the way for their application in all-solid-state Li-batteries.