Fundamental investigations on the ionic transport and thermodynamic properties of non-aqueous potassium-ion electrolytes

Shobhan Dhir, Ben Jagger, Alen Maguire and Mauro Pasta ()
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Shobhan Dhir: University of Oxford
Ben Jagger: University of Oxford
Alen Maguire: University of Oxford
Mauro Pasta: University of Oxford

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Non-aqueous potassium-ion batteries (KIBs) represent a promising complementary technology to lithium-ion batteries due to the availability and low cost of potassium. Moreover, the lower charge density of K+ compared to Li+ favours the ion-transport properties in liquid electrolyte solutions, thus, making KIBs potentially capable of improved rate capability and low-temperature performance. However, a comprehensive study of the ionic transport and thermodynamic properties of non-aqueous K-ion electrolyte solutions is not available. Here we report the full characterisation of the ionic transport and thermodynamic properties of a model non-aqueous K-ion electrolyte solution system comprising potassium bis(fluorosulfonyl)imide (KFSI) salt and 1,2-dimethoxyethane (DME) solvent and compare it with its Li-ion equivalent (i.e., LiFSI:DME), over the concentration range 0.25–2 molal. Using tailored K metal electrodes, we demonstrate that KFSI:DME electrolyte solutions show higher salt diffusion coefficients and cation transference numbers than LiFSI:DME solutions. Finally, via Doyle-Fuller-Newman (DFN) simulations, we investigate the K-ion and Li-ion storage properties for K∣∣graphite and Li∣∣graphite cells.

Date: 2023
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DOI: 10.1038/s41467-023-39523-0

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