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Investigation of Potassium Storage in Layered P3-Type K0.5 MnO2 Cathode.

  • Author(s): Kim, Haegyeom
  • Seo, Dong-Hwa
  • Kim, Jae Chul
  • Bo, Shou-Hang
  • Liu, Lei
  • Shi, Tan
  • Ceder, Gerbrand
  • et al.

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 K0.5 MnO2 as a potential cathode material for K-ion batteries as an alternative to Li technology. K0.5 MnO2 has a P3-type layered structure and delivers a reversible specific capacity of ≈100 mAh g-1 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.

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