Issue 32, 2024

An ultralow-concentration (0.05 M) electrolyte for advanced K-ion batteries

Abstract

Owing to their low viscosity, low corrosion risk, and low cost, ultralow-concentration electrolytes for rechargeable alkali-metal-ion batteries have received much research interest. Herein, we report an ultralow-concentration electrolyte (<0.1 M) for K-ion batteries (KIBs). Using the electrolyte with only 0.05 M potassium bis(fluorosulfonyl)imide (KFSI) in ethylene carbonate (EC) and ethyl methyl carbonate (EMC) as an example, we found that KIBs with this ultralow-concentration electrolyte could deliver considerable electrochemical performance over a wide range of temperature (0–60 °C). The delivered specific capacities and cycling performances of KIBs with 0.05 M and 1.0 M electrolytes were almost equivalent when tested at 25 °C and 60 °C. Moreover, when tested at 0 °C, KIBs with 0.05 M electrolyte could even deliver a higher specific capacity and initial coulombic efficiency than those with 1.0 M electrolyte. The formation of a KF inorganic component in the solid electrolyte interphase layer for this ultralow-concentration electrolyte could facilitate the transfer of K+ ions and favor electrode stability. This work sheds light on the development of ultralow-concentration electrolytes for rechargeable alkali-metal-ion batteries.

Graphical abstract: An ultralow-concentration (0.05 M) electrolyte for advanced K-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
02 abr 2024
Accepted
05 jul 2024
First published
08 jul 2024

J. Mater. Chem. A, 2024,12, 20927-20934

An ultralow-concentration (0.05 M) electrolyte for advanced K-ion batteries

G. Zhu, G. Yang, B. Huang, B. Wang, X. Ye, Z. Zheng, B. Feng, X. Zeng, D. Bin, L. Liu and D. Li, J. Mater. Chem. A, 2024, 12, 20927 DOI: 10.1039/D4TA02189D

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