Enhancing the Reversibility of Mg/S Battery Chemistry through Li+ Mediation

Tao Gao, Malachi Noked, Alex J. Pearse, Eleanor Gillette, Xiulin Fan, Yujie Zhu, Chao Luo, Liumin Suo, Marshall A. Schroeder, Kang Xu, Sang Bok Lee, Gary W. Rubloff, Chunsheng Wang

Research output: Contribution to journalArticlepeer-review

224 Scopus citations

Abstract

Mg metal is a promising anode material for next generation rechargeable battery due to its dendrite-free deposition and high capacity. However, the best cathode for rechargeable Mg battery was based on high molecular weight MgxMo3S4, thus rendering full cell energetically uncompetitive. To increase energy density, high capacity cathode material like sulfur is proposed. However, to date, only limited work has been reported on Mg/S system, all plagued by poor reversibility attributed to the formation of electrochemically inactive MgSx species. Here, we report a new strategy, based on the effect of Li+ in activating MgSx species, to conjugate a dendrite-free Mg anode with a reversible polysulfide cathode and present a truly reversible Mg/S battery with capacity up to 1000 mAh/gs for more than 30 cycles. Mechanistic insights supported by spectroscopic and microscopic characterization strongly suggest that the reversibility arises from chemical reactivation of MgSx by Li+.

Original languageEnglish
Pages (from-to)12388-12393
Number of pages6
JournalJournal of the American Chemical Society
Volume137
Issue number38
DOIs
StatePublished - 30 Sep 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

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