Investigation of Potassium Storage in Layered P3‐Type K<sub>0.5</sub>MnO<sub>2</sub> Cathode

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  • Haegyeom Kim
    Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  • Dong‐Hwa Seo
    Department of Materials Science and Engineering University of California Berkeley CA 94720 USA
  • Jae Chul Kim
    Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  • Shou‐Hang Bo
    Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  • Lei Liu
    Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
  • Tan Shi
    Department of Materials Science and Engineering University of California Berkeley CA 94720 USA
  • Gerbrand Ceder
    Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

書誌事項

公開日
2017-08-07
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/adma.201702480
公開者
Wiley

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説明

<jats:p>Novel and low‐cost batteries are of considerable interest for application in large‐scale energy storage systems, for which the cost per cycle becomes critical. Here, this study proposes K<jats:sub>0.5</jats:sub>MnO<jats:sub>2</jats:sub> as a potential cathode material for K‐ion batteries as an alternative to Li technology. K<jats:sub>0.5</jats:sub>MnO<jats:sub>2</jats:sub> has a P3‐type layered structure and delivers a reversible specific capacity of ≈100 mAh g<jats:sup>−1</jats:sup> with good capacity retention. In situ X‐ray diffraction analysis reveals that the material undergoes a reversible phase transition upon K extraction and insertion. In addition, first‐principles calculations indicate that this phase transition is driven by the relative phase stability of different oxygen stackings with respect to the K content.</jats:p>

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