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 language | English |
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Article number | 1702480 |
Journal | Advanced Materials |
Volume | 29 |
Issue number | 37 |
DOIs | |
State | Published - 4 Oct 2017 |
Keywords
- batteries
- energy storage
- layered compounds
- potassium