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A Low-Cost and Environmentally Friendly Mixed Polyanionic Cathode for Sodium-Ion Storage |
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| Authors: | Tianyi Song Dr Wenjiao Yao Dr Pinit Kiadkhunthod Dr Yongping Zheng Nanzhong Wu Dr Xiaolong Zhou Dr Sarayut Tunmee Dr Suchinda Sattayaporn Prof?Dr Yongbing Tang |
| Institution: | 1. Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123 China These authors contributed equally to this work.;2. Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China These authors contributed equally to this work.;3. Synchrotron Light Research Institute, Nakhon Ratchasima, 30000 Thailand These authors contributed equally to this work.;4. Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China;5. Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China University of Chinese Academy of Sciences, Beijing, 100049 China;6. Synchrotron Light Research Institute, Nakhon Ratchasima, 30000 Thailand |
| Abstract: | Sodium-ion batteries (NIBs) are the most promising alternatives to lithium-ion batteries in the development of renewable energy sources. The advancement of NIBs depends on the exploration of new electrode materials and fundamental understanding of working mechanisms. Herein, via experimental and simulation methods, we develop a mixed polyanionic compound, Na2Fe(C2O4)SO4?H2O, as a cathode for NIBs. Thanks to its rigid three dimensional framework and the combined inductive effects from oxalate and sulfate, it delivered reversible Na insertion/desertion at average discharging voltages of 3.5 and 3.1 V for 500 cycles with Coulombic efficiencies of ca. 99 %. In situ synchrotron X-ray measurements and DFT calculations demonstrate the Fe2+/Fe3+ redox reactions contribute to electron compensation during Na+ desertion/insertion. The study suggests mixed polyanionic frameworks may provide promising materials for Na ion storage with the merits of low cost and environmental friendliness. |
| Keywords: | Eisen Nachhaltige Chemie Natrium-Ionen-Batterien Polyanionische Kathoden |