Investigation of Potassium Storage in Layered P3-Type K<sub>0.5</sub> MnO<sub>2</sub> Cathode.
basic_science · Level V
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- Record sourced from PubMed, PMID 28782851.
- Also identified by DOI 10.1002/adma.201702480.
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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 K<sub>0.5</sub> MnO<sub>2</sub> as a potential cathode material for K-ion batteries as an alternative to Li technology. K<sub>0.5</sub> MnO<sub>2</sub> has a P3-type layered structure and delivers a reversible specific capacity of ≈100 mAh g<sup>-1</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.