Electrochemically active binary anion compounds with tailored oxygen vacancy for energy storage system

John Hong, Juwon Lee, Young Woo Lee, Woon Bae Park, Docheon Ahn, Jong Bae Park, Sangyeon Pak, Jaeyoon Baik, Stephen M. Morris, Seung Nam Cha, Kee Sun Sohn, Jung Inn Sohn

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The search for new materials that exhibit rapid Faradaic energy-storing behavior continues to be ever more important as they offer a promising alternative to battery technology because of their unrivalled ability to deliver large amounts of power along with large amounts of energy. Here, we present a reduced binary anion compound (r-BAC) as a first demonstration of redox-active materials, which are fabricated by a facile and direct activation synthetic method. The r-BAC exhibits excellent energy storage characteristics compared to non-reduced full binary anion compound (f-BAC). Based on the density functional theory (DFT) calculations and the ex-situ chemical study, it is found that the superior electrochemical performance is strongly attributed to not only the Ni cation sites (Ni2+/Ni3+ redox couple) that are energetically more activated by oxygen vacancies, but also to the additive electrochemical activity at the unsaturated sulfur sites (S4+/S6+ redox couple) in a binary anion. Thus, we expect that this study on the binary anion material and the corresponding anion-based charge transfer mechanisms may provide a new strategy for the efficient storage of charge in next-generation energy storage applications.

Original languageEnglish
Article number227301
JournalJournal of Power Sources
Volume444
DOIs
StatePublished - 31 Dec 2019

Keywords

  • Energy storage system
  • Faradaic redox reaction
  • Ni–S–O compound
  • Reduced binary anion
  • Tailored oxygen vacancy

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