Fe‐Based Tunnel‐Type Na0.61[Mn0.27Fe0.34Ti0.39]O2 Designed by a New Strategy as a Cathode Material for Sodium‐Ion Batteries |
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| Authors: | Shuyin Xu Yuesheng Wang Liubin Ben Yingchun Lyu Ningning Song Zhenzhong Yang Yunming Li Linqin Mu Hai‐Tao Yang Lin Gu Yong‐Sheng Hu Hong Li Zhao‐Hua Cheng Liquan Chen Xuejie Huang |
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| Affiliation: | 1. Key Laboratory for Renewable EnergyBeijing Key Laboratory for New Energy Materials and Devices, National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of Sciences, Beijing, China;2. State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of PhysicsChinese Academy of Sciences, Beijing, China;3. Laboratory of Advanced Materials & Electron Microscopy, Beijing National Laboratory for Condensed Matter Physics, Institute of PhysicsChinese Academy of Sciences, Beijing, China;4. Collaborative Innovation Center of Quantum Matter, 100190, China |
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| Abstract: | Sodium‐ion batteries are promising for grid‐scale storage applications due to the natural abundance and low cost of sodium. However, few electrodes that can meet the requirements for practical applications are available today due to the limited routes to exploring new materials. Here, a new strategy is proposed through partially/fully substituting the redox couple of existing negative electrodes in their reduced forms to design the corresponding new positive electrode materials. The power of this strategy is demonstrated through the successful design of new tunnel‐type positive electrode materials of Na0.61[Mn0.61‐xFexTi0.39]O2, composed of non‐toxic and abundant elements: Na, Mn, Fe, Ti. In particular, the designed air‐stable Na0.61[Mn0.27Fe0.34Ti0.39]O2 shows a usable capacity of ≈90 mAh g?1, registering the highest value among the tunnel‐type oxides, and a high storage voltage of 3.56 V, corresponding to the Fe3+/Fe4+ redox couple realized for the first time in non‐layered oxides, which was confirmed by X‐ray absorption spectroscopy and Mössbauer spectroscopy. This new strategy would open an exciting route to explore electrode materials for rechargeable batteries. |
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| Keywords: | energy storage Fe3+/Fe4+ redox couple rechargeable batteries sodium‐ion batteries tunnel‐type oxides |
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