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

Haegyeom Kim, Dong Hwa Seo, Jae Chul Kim, Shou Hang Bo, Lei Liu, Tan Shi, Gerbrand Ceder

Research output: Contribution to journalArticlepeer-review

308 Scopus citations

Abstract

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 K0.5MnO2 as a potential cathode material for K-ion batteries as an alternative to Li technology. K0.5MnO2 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.

Original languageEnglish
Article number1702480
JournalAdvanced Materials
Volume29
Issue number37
DOIs
StatePublished - 4 Oct 2017

Keywords

  • batteries
  • energy storage
  • layered compounds
  • potassium

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