Hydrated eutectic electrolytes for high-performance Mg-ion batteries

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)1282-1292
Number of pages11
JournalEnergy & Environmental Science
Volume15
Issue number3
DOIs
StatePublished - 2022

Bibliographical note

KAUST Repository Item: Exported on 2022-06-12
Acknowledgements: Research reported in this work was supported by King Abdullah University of Science Technology (KAUST).

Fingerprint

Dive into the research topics of 'Hydrated eutectic electrolytes for high-performance Mg-ion batteries'. Together they form a unique fingerprint.

Cite this