Ether-Water Hybrid Electrolyte Contributing to Excellent Mg Ion Storage in Layered Sodium Vanadate

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xiaoke Wang
  • Xixi Zhang
  • Gang Zhao
  • Zijie Tang
  • Xijin Xu
  • Cuiping Han

Detail(s)

Original languageEnglish
Pages (from-to)6093–6102
Journal / PublicationACS Nano
Volume16
Issue number4
Online published21 Mar 2022
Publication statusPublished - 26 Apr 2022

Abstract

Magnesium ion batteries have potential for large-scale energy storage. However, the high charge density of Mg2+ ions establishes a strong intercalation energy barrier in host materials, causing sluggish diffusion kinetics and structural degradation. Here, we report that the kinetic and dissolution issues connected to cathode materials can be resolved simultaneously using a tetraethylene glycol dimethyl ether (TEGDME)-water hybrid electrolyte. The lubricating and shielding effect of water solvent could boost the swift transport of Mg2+, contributing to a high diffusion coefficient within the sodium vanadate (NaV8O20·nH2O) cathode. Meanwhile, the organic TEGDME component can coordinate with water to diminish its activity, thus providing the hybrid electrolyte with a broad electrochemical window of 3.9 V. More importantly, the TEGDME preferentially amassed at the interface, leading to a robust cathode electrolyte interface layer that suppresses the dissolution of vanadium species. Consequently, the NaV8O2nHcathode achieved a specific capacity of 351 mAh g-1 at 0.3 A g-1 and a long cycle life of 1000 cycles in this hybrid electrolyte. A  mechanism study revealed the reversible interaction of Mg2+ during cycles. This organic water hybrid electrolyte is effective for overcoming the difficulty of multivalent ion storage.

Research Area(s)

  • ether solvent, hybrid electrolyte, magnesium ion battery, multivalent ion, vanadium oxide

Citation Format(s)

Ether-Water Hybrid Electrolyte Contributing to Excellent Mg Ion Storage in Layered Sodium Vanadate. / Wang, Xiaoke; Zhang, Xixi; Zhao, Gang; Hong, Hu; Tang, Zijie; Xu, Xijin; Li, Hongfei; Zhi, Chunyi; Han, Cuiping.

In: ACS Nano, Vol. 16, No. 4, 26.04.2022, p. 6093–6102.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review