Phase-Controlled Electrochemical Activity of Epitaxial Mg-Spinel Thin Films

Zhenxing Feng*, Xiao Chen, Liang Qiao, Albert L. Lipson, Timothy T. Fister, Li Zeng, Chunjoong Kim, Tanghong Yi, Niya Sa, Danielle L. Proffit, Anthony K. Burrell, Jordi Cabana, Brian J. Ingram, Michael D. Biegalski, Michael J. Bedzyk, Paul Fenter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


We report an approach to control the reversible electrochemical activity (i.e., extraction/insertion) of Mg2+ in a cathode host through the use of phase-pure epitaxiallystabilized thin filmstructures. The epitaxiallystabilized MgMn2O4 (MMO) thin films in the distinct tetragonal and cubic phases are shown to exhibit dramatically different properties (in a nonaqueous electrolyte, Mg(TFSI)2 in propylene carbonate): tetragonal MMO shows negligible activity while the cubic MMO (normally found as polymorph at high temperature or high pressure) exhibits reversible Mg2+ activity with associated changes in filmstructure and Mn oxidationstate. These results demonstrate a novelstrategy for identifying the factors that control multivalent cation mobility in next-generation battery materials.

Original languageEnglish (US)
Pages (from-to)28438-28443
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number51
StatePublished - Dec 30 2015


  • Mg-spinel
  • epitaxial phasestabilization
  • multivalent insertion
  • phase-selective electrochemical activity
  • pulsed laser deposition

ASJC Scopus subject areas

  • Materials Science(all)


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