Issue 7, 2021

Developing better ester- and ether-based electrolytes for potassium-ion batteries

Abstract

Potassium-ion batteries (PIBs) have attracted extensive attention for next-generation energy storage systems because of the high abundance of potassium resources and low cost. However, the electrochemical performance of PIBs still cannot satisfy the requirements of practical application. One of the most effective strategies to improve the electrochemical performance of PIBs is electrolyte optimization. In this review, we focus on recent advances in ester- and ether-based electrolytes for high-performance PIBs. First, we discuss the requirements and components of organic electrolytes (potassium salts and solvents) for PIBs. Then, the strategies toward optimizing the electrolytes have been summarized, including potassium salt optimization, solvent optimization, electrolyte concentration optimization, and introducing electrolyte additives. In general, the electrolyte optimization methods can adjust the solvation energy, the lowest unoccupied molecular orbital energy level, and the highest occupied molecular orbital energy level, which are beneficial for achieving fast kinetics, stable and highly K+-conductive solid-electrolyte interphase layer, and superior oxidation resistance, respectively. Future studies should focus on exploring the effects of composition on electrolyte characteristics and the corresponding laws. This review provides some significant guidance to develop better electrolytes for high-performance PIBs.

Graphical abstract: Developing better ester- and ether-based electrolytes for potassium-ion batteries

Article information

Article type
Review Article
Submitted
30 nov 2020
Accepted
23 dec 2020
First published
15 jan 2021
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2021,12, 2345-2356

Developing better ester- and ether-based electrolytes for potassium-ion batteries

L. Li, S. Zhao, Z. Hu, S. Chou and J. Chen, Chem. Sci., 2021, 12, 2345 DOI: 10.1039/D0SC06537D

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