Research Institute of Electrochemical EnergyDepartment of Energy and Environment (RIECEN)National Institute of Advanced Industrial Science and Technology (AIST) 1–8–31 Midorigaoka Ikeda Osaka 563–8577 Japan
Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL)AIST-Kyoto University Sakyo–ku Kyoto 606–8501 Japan
Japan Synchrotron Radiation Research Institute 1-1-1 Kouto, Sayo-cho, Sayo-gun Hyogo 679‐5198 Japan
Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts and Telecommunications 9 Wenyuan Road Nanjing 210023 P. R. China
Department of Applied ChemistryCollege of Life SciencesRitsumeikan University 1-1-1 Noji-higashi Kusatsu Shiga 535‐8577 Japan
A layered oxide cathode is identified in the K2O–Fe2O3–MnO2 ternary phase system that shows facile and reversible K‐ion mobility via a cumulative participation of cationic and anionic redox reaction, paving the way for the further development of high‐energy‐density cathode materials for K‐ion batteries that effectively rely on both cation and anion multi‐redox chemistry. More details can be found in article number 2000039 by Titus Masese, Zhen‐Dong Huang, Yuki Orikasa, and co‐workers.
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