Investigation of Potassium Storage in Layered P3‐Type K0.5MnO2 Cathode |
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| Authors: | Haegyeom Kim Dong‐Hwa Seo Jae Chul Kim Shou‐Hang Bo Lei Liu Tan Shi Gerbrand Ceder |
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| Affiliation: | 1. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;2. Department of Materials Science and Engineering, University of California, Berkeley, CA, USA;3. University of Michigan–Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Minhang District, Shanghai, P. R. China;4. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA |
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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 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. |
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| Keywords: | batteries energy storage layered compounds potassium |
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