論文

査読有り
2021年1月27日

Nonpolarizing oxygen-redox capacity without O-O dimerization in Na2Mn3O7

Nature Communications
  • Akihisa Tsuchimoto
  • ,
  • Xiang-Mei Shi
  • ,
  • Kosuke Kawai
  • ,
  • Benoit Mortemard de Boisse
  • ,
  • Jun Kikkawa
  • ,
  • Daisuke Asakura
  • ,
  • Masashi Okubo
  • ,
  • Atsuo Yamada

12
開始ページ
631
終了ページ
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/s41467-020-20643-w
出版者・発行元
Springer Science and Business Media LLC

<title>Abstract</title>Reversibility of an electrode reaction is important for energy-efficient rechargeable batteries with a long battery life. Additional oxygen-redox reactions have become an intensive area of research to achieve a larger specific capacity of the positive electrode materials. However, most oxygen-redox electrodes exhibit a large voltage hysteresis &gt;0.5 V upon charge/discharge, and hence possess unacceptably poor energy efficiency. The hysteresis is thought to originate from the formation of peroxide-like O22− dimers during the oxygen-redox reaction. Therefore, avoiding O-O dimer formation is an essential challenge to overcome. Here, we focus on Na2-<italic>x</italic>Mn3O7, which we recently identified to exhibit a large reversible oxygen-redox capacity with an extremely small polarization of 0.04 V. Using spectroscopic and magnetic measurements, the existence of stable O−• was identified in Na2-<italic>x</italic>Mn3O7. Computations reveal that O−• is thermodynamically favorable over the peroxide-like O22− dimer as a result of hole stabilization through a (σ + π) multiorbital Mn-O bond.

リンク情報
DOI
https://doi.org/10.1038/s41467-020-20643-w
URL
http://www.nature.com/articles/s41467-020-20643-w.pdf
URL
http://www.nature.com/articles/s41467-020-20643-w
ID情報
  • DOI : 10.1038/s41467-020-20643-w
  • eISSN : 2041-1723

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