Rechargeable Aqueous Mn Metal Battery Enabled by Inorganic-Organic Interfaces

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

7 Scopus Citations
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Author(s)

  • Xiaofeng Qu
  • Xincheng He
  • Yuan Shao
  • Yong Zhang
  • Rong Zhang
  • Duanyang Kong
  • Zhicong Shi
  • Jun Liu
  • Jieshan Qiu
  • Chunyi Zhi

Detail(s)

Original languageEnglish
Article numbere202206471
Journal / PublicationAngewandte Chemie (International Edition)
Online published2 Jun 2022
Publication statusOnline published - 2 Jun 2022

Abstract

Aqueous batteries that use metal anodes exhibit maximum anodic capacity, whereas the energy density is still unsatisfactory partially due to the high redox potential of metal anode. Current metal anode is plagued by the dilemma that the redox potential of Zn is not low enough while Al, Mg, and others with excessively low redox potential cannot work properly in aqueous electrolytes. Mn metal with suitably low redox potential is a promising candidate, which was rarely explored before. Here, we report a rechargeable aqueous Mn metal battery enabled by a well-designed electrolyte and robust inorganic-organic interfaces. The inorganic Sn-based interface with a bottom-up microstructure is constructed to preliminarily suppress water decomposition. With this bubble-free interface, the organic interface can be formed via esterification reaction of sucrose triggered by acyl chloride in the electrolyte, generating a dense physical shield that isolates water while permitting Mn2+ diffusion. Hence, a Mn symmetric cell achieves a superior plating/stripping stability for 200 hours, and a Mn||V2O5 battery maintains approximately 100% capacity after 200 cycles. Moreover, the Mn||V2O5 battery realizes a much higher output voltage than that of the Zn||V2O5 battery, evidencing the possibility of increasing energy density through using Mn anode. This work develops a systematic strategy to stabilize Mn metal anode for Mn metal batteries, opening a new door towards enhanced voltage of aqueous batteries.