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タイトル: | Intermediate honeycomb ordering to trigger oxygen redox chemistry in layered battery electrode |
著者: | Mortemard de Boisse, Benoit Liu, Guandong Ma, Jiangtao Nishimura, Shin-ichi Chung, Sai-Cheong Kiuchi, Hisao Harada, Yoshihisa Kikkawa, Jun Kobayashi, Yoshio Okubo, Masashi Yamada, Atsuo |
著者名の別形: | 西村, 真一 大久保, 將史 山田, 淳夫 |
キーワード: | Batteries Organometallic chemistry |
発行日: | 18-Apr-2016 |
出版者: | Springer Nature |
誌名: | Nature Communications |
巻: | 7 |
論文番号: | 11397 |
抄録: | Sodium-ion batteries are attractive energy storage media owing to the abundance of sodium, but the low capacities of available cathode materials make them impractical. Sodium-excess metal oxides Na2MO3 (M: transition metal) are appealing cathode materials that may realize large capacities through additional oxygen redox reaction. However, the general strategies for enhancing the capacity of Na2MO3 are poorly established. Here using two polymorphs of Na2RuO3, we demonstrate the critical role of honeycomb-type cation ordering in Na2MO3. Ordered Na2RuO3 with honeycomb-ordered [Na1/3Ru2/3]O2 slabs delivers a capacity of 180 mAh g[−1] (1.3-electron reaction), whereas disordered Na2RuO3 only delivers 135 mAh g[−1] (1.0-electron reaction). We clarify that the large extra capacity of ordered Na2RuO3 is enabled by a spontaneously ordered intermediate Na1RuO3 phase with ilmenite O1 structure, which induces frontier orbital reorganization to trigger the oxygen redox reaction, unveiling a general requisite for the stable oxygen redox reaction in high-capacity Na2MO3 cathodes. |
著作権等: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. |
URI: | http://hdl.handle.net/2433/226837 |
DOI(出版社版): | 10.1038/ncomms11397 |
PubMed ID: | 27088834 |
出現コレクション: | 学術雑誌掲載論文等 |
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