[ Instrument Network Instrument Development ] Recently, Tang Yongbing, a researcher at the Functional Thin Film Materials Research Center of the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and his team members jointly developed a new sodium ion battery cathode material in cooperation with the National Synchrotron Radiation Source Research Institute of Thailand. The positive electrode material is low in cost and environmentally friendly, and this work has important reference significance for developing low-cost environmentally-friendly electrode materials and energy storage devices. A low-cost and environmental friendly mixed polyanionic cathode for sodium-ion storage ("a low-cost and environmentally friendly mixed polyanionic sodium ion battery cathode material") has been published online in "German Applied Chemistry" (Angew Chem. Int. Edi, 2019, DOI: 10.1002/anie.201912272).
Traditional lithium-ion batteries (LIBs) have found wide applications in portable electronic devices and electric multifunction tools. However, due to the scarcity and uneven distribution of lithium resources and the scarcity of cobalt resources for cathode materials, LIBs are difficult to meet the application needs of large-scale energy storage. Sodium ions have similar chemical properties to lithium and are abundant in reserves. Therefore, sodium ion batteries have important application prospects in the field of large-scale energy storage. Currently, the main technical bottleneck limiting sodium ion battery applications is the lack of suitable and inexpensive cathode materials. The main reason is that sodium ions have a larger ionic radius than lithium ions, and it is relatively difficult for sodium ions to escape and intercalate in the positive electrode material, thus requiring a more stable crystal skeleton and a larger ion diffusion channel.
Based on the above considerations, Tang Yongbing and his team members Song Tianyi, Yao Wenjiao and Zheng Yongping successfully combined a theoretical calculation and experiment to successfully develop a new type of Na2Fe(SO4)(C2O4)·H2O sodium positive electrode material. The sodium electric cathode material exhibits excellent electrochemical reversibility and stability. Further in situ synchrotron radiation and XRD characterization and first-principles calculations show that the electrochemical activity of the material originates from the Fe2+/Fe3+ redox pair; the high electrochemical stability results from the material having a large size sodium ion transport channel. And high crystal structure stability. This work is important for the development of new electrode materials and the development of efficient and low-cost battery technology.
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