High-Energy Aqueous Magnesium Hybrid Full Batteries Enabled by Carrier-Hosting Potential Compensation

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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  • Yongchao Tang
  • Xuejin Li
  • Haiming Lv
  • Wenlong Wang


Original languageEnglish
Pages (from-to)5443-5452
Journal / PublicationAngewandte Chemie - International Edition
Issue number10
Online published22 Nov 2020
Publication statusPublished - 1 Mar 2021


Underachieved capacity and low voltage plateau is ubiquitous in conventional aqueous magnesium ion full batteries. Such limitations originate from the electrochemistry and the low carrier-hosting ((de)intercalation) potential of electrode materials. Herein, via a strategy of enhancing the electrochemistry through carrier-hosting potential compensation, high-energy Mg2+/Na+ hybrid batteries are achieved. A Mg1.5VCr(PO4)3 (MVCP) cathode is coupled with FeVO4 (FVO) anode in a new aqueous/organic hybrid electrolyte, giving reliable high-voltage operation. This operation enables more sufficient (de)intercalation of hybrid carriers (Mg2+/Na+), thereby enhancing the reversible capacity remarkably (233.4 mA h g−1 at 0.5 A g−1, 92.7 Wh kg−1electrode, that is, ≥1.75-fold higher than those in conventional aqueous electrolytes). The relatively high Na+-hosting potential of the electrodes compensates for the low Mg2+-hosting potential and widens/elevates the discharge plateau of the full battery up to 1.50 V. Mechanism study further reveals an unusual phase transformation of FVO to Fe2V3 and the low-lattice-strain pseudocapacitive (de)intercalation chemistry of MVCP.

Research Area(s)

  • aqueous magnesium-ion batteries, aqueous/organic hybrid electrolyte, enhancing electrochemistry, hosting potential compensation