Issue 31, 2022

New enhancement mechanism of an ether-based electrolyte in cobalt sulfide-containing potassium-ion batteries

Abstract

The performance of potassium (K)-ion batteries (KIBs) is not only dependent on electrode materials but also highly related to the electrolyte. In this work, we obtained a cobalt sulfide (CoS)-containing hybrid by the hydrothermal method and subsequent thermal treatment for K-ion storage. After ether-based electrolyte matching, the CoS-containing hybrid achieves a specific capacity of 229 mA h g−1 at 1 A g−1 after 300 cycles, and presents enhanced performance in the ether-based electrolyte. According to our measurement and calculation, the CoS-containing hybrid in the ether-based electrolyte promotes the formation of a highly anionic coordination solvated structure, which contributes to the enhancement of the stability of the electrolyte for K-ion storage. In addition, the strong coordination of anions also facilitates the rapid separation of the solvent during the potassiation process, which is also in favor of the decrease of the side reaction of the CoS@RGO hybrid for KIBs. We believe that our work will provide a new perspective on electrolyte engineering to boost the electrode material performance for K-ion storage.

Graphical abstract: New enhancement mechanism of an ether-based electrolyte in cobalt sulfide-containing potassium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
22 Jun 2022
Accepted
16 Jul 2022
First published
18 Jul 2022

Nanoscale, 2022,14, 11179-11186

New enhancement mechanism of an ether-based electrolyte in cobalt sulfide-containing potassium-ion batteries

E. Li, L. Ma, Z. Li, H. Wang, G. Zhang, S. Li, J. Li, L. Pan, W. Mai and J. Li, Nanoscale, 2022, 14, 11179 DOI: 10.1039/D2NR03418B

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