DataVXAdvanced Energy MaterialsPaper
journal article·2025-08Open access

Ultra‐High‐Capacity of Earth‐Abundant Cathodes Enabled by Excess Fluoride‐Ion Insertion/Extraction

Yanchang Wang, Kentaro Yamamoto, Yuki Sakaguchi, Jun Miyawaki, Toshiyuki Matsunaga, Datong Zhang, Hisao Kiuchi, Zulai Cao, Koji Nakanishi, Toshiki Watanabe, Neha Thakur, Mukesh Kumar, Hidenori Miki, Hideki Iba, Kazuhiko Maeda, Yoshihisa Harada, Hiroshi Kageyama, Yoshiharu Uchimoto

Advanced Energy Materials· Volume 15· Issue 29
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Abstract

Abstract All‐solid‐state fluoride‐ion batteries (FIBs) are highly prospective candidates for next‐generation batteries due to their superior energy density and safety to lithium‐ion batteries (LIBs). Nevertheless, the full potential of FIBs remains unrealized, as practical cathode materials remain elusive. Here, a perovskite oxyfluoride SrFeO2Fx is reported to exhibit topotactic F− (de)intercalation and provide a large capacity of 350 mAh g−1 (1843 mAh cm−3) with negligibly small volume expansion (≈0.5%). The large capacity is attributed to excess F− (de)intercalation of ≈2.3 mol in SrFeO2Fx with Fe2+/Fe3+ redox and oxygen redox. Furthermore, Sr‐substituted CaFeO2Fx (Ca0.8Sr0.2FeO2Fx) has the highest capacity of 580 mAh g−1 (2595 mAh cm−3) among cathode materials using the topotactic ion (de)intercalation, including LIBs. For the first time, the possibility is presented that the utilization of ultimate anion redox associated with the ion (de)intercalation to achieve specific capacities surpassing current active materials by over twofold.
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Research context

Energy storageElectronic materials

OpenAlex topics: Inorganic Fluorides and Related Compounds · Advancements in Battery Materials · Inorganic Chemistry and Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Graduate School of Human and Environmental Studies Kyoto University Sakyo‐ku Kyoto 606–8501 Japan

Faculty of Engineering Nara Women's University Kitauoya‐nishimatchi Nara 630–8263 Japan

NanoTerasu Center National Institutes for Quantum Science and Technology 6‐6‐11, Aramaki Aoba, Aoba‐ku Sendai Miyagi 980–8579 Japan

Institute for Solid State Physics The University of Tokyo Kashiwa Chiba 277–8581 Japan

Laboratory of Advanced Science and Technology for Industry University of Hyogo 3‐1‐2 Koto, Kamigori‐cho Ako‐gun Hyogo 678–1205 Japan

Toyota Motor Corporation Advanced Material Engineering Division Higashifuji Technical Center 1200 Mishuku Susono Shizuoka 410–1193 Japan

Department of Chemistry School of Science Institute of Science Tokyo 2‐12‐1‐NE‐2 Ookayama Meguro‐ku Tokyo 152–8550 Japan

Research Center for Autonomous Systems Materialogy (ASMat) Institute of Science Tokyo 4259 Nagatsuta‐cho Yokohama Kanagawa 226–8501 Japan

Department of Energy and Hydrocarbon Chemistry Graduate School of Engineering Kyoto University Nishikyo‐ku Kyoto 615–8510 Japan

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