Issue 3, 2022

Hydrated eutectic electrolytes for high-performance Mg-ion batteries

Abstract

Aqueous Mg-ion batteries are a promising electrochemical energy storage technology. However, Mg2+ ions interact strongly with electrolyte molecules and electrode materials, resulting in insufficient ionic conductivity and solid-state diffusion, and consequently limited cycling stability and rate capability. Herein, we design an aqueous Mg-ion battery chemistry involving a hydrated eutectic electrolyte, an organic molecule anode, and a copper hexacyanoferrate (CuHCF) cathode. This hydrated eutectic electrolyte features a three-dimensional percolating hydrogen bond network formed by water molecules, which facilitates fast Mg2+ transport in the electrolyte. Moreover, the suppression of water activity in the hydrated eutectic electrolyte can efficiently improve the cycling performance of the organic molecule anode by prohibiting the dissolution issue. After coupling with the open-framework CuHCF cathode, the resultant full battery delivers a wide operating voltage of 2.2 V, an energy density of 52.2 W h kg−1, and a decent low-temperature electrochemical performance. The electrolyte and electrode chemistries proposed in this work show an alternative way to develop low-cost, safe, and high-performance Mg battery technologies.

Graphical abstract: Hydrated eutectic electrolytes for high-performance Mg-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
27 Nov. 2021
Accepted
26 Janv. 2022
First published
26 Janv. 2022
This article is Open Access
Creative Commons BY-NC license

Energy Environ. Sci., 2022,15, 1282-1292

Hydrated eutectic electrolytes for high-performance Mg-ion batteries

Y. Zhu, X. Guo, Y. Lei, W. Wang, A. Emwas, Y. Yuan, Y. He and H. N. Alshareef, Energy Environ. Sci., 2022, 15, 1282 DOI: 10.1039/D1EE03691B

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