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Investigation of Potassium Storage in Layered P3‐Type K 0.5 MnO 2 Cathode
Author(s) -
Kim Haegyeom,
Seo DongHwa,
Kim Jae Chul,
Bo ShouHang,
Liu Lei,
Shi Tan,
Ceder Gerbrand
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201702480
Subject(s) - materials science , cathode , energy storage , phase transition , extraction (chemistry) , phase (matter) , diffraction , potassium , chemical engineering , nanotechnology , thermodynamics , chemistry , metallurgy , organic chemistry , power (physics) , physics , optics , engineering
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 0.5 MnO 2 as a potential cathode material for K‐ion batteries as an alternative to Li technology. K 0.5 MnO 2 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.