The Institute of Process of the Chinese Academy of Sciences first synthesized sodium vanadium fluorophosphate, a high-voltage cathode material for sodium ion batteries.

by:CTECHi     2021-09-14
Recently, the reporter learned from the Institute of Process Engineering of the Chinese Academy of Sciences that the team of Zhao Junmei, an associate researcher of the Green Chemical Research Department of the Institute, has developed a low-cost and convenient room temperature controllable technology for polyanionic compounds, and synthesized the high-voltage cathode material fluorine for sodium ion batteries for the first time. Sodium vanadium phosphate, this material has excellent rate performance and long-cycle performance without any post-solving. It can be said that laboratory research on sodium vanadium fluorophosphate has reached the international leading level. The research results were recently published in 'JouleIn view of the high price of lithium resources and limited geological reserves and other restrictions on the future development of lithium-ion, high hopes are placed on sodium-ion batteries that have similar working principles to lithium-ion batteries. 'The reserves of sodium in the earth's crust are much higher than those of lithium, which is expected to support the continued development of large-scale energy storage technology.' Zhao Junmei told a reporter from my country Science Daily. The large-scale and low-cost preparation of a kind of important sodium ion battery cathode material 'polyanionic compound sodium vanadium fluorophosphate' is restricting its commercialization process. This type of material has an energy density of up to 480Wh/kg. If sodium vanadium fluorophosphate can be used industrially, the energy density of the full battery can be comparable to that of lithium ion batteries. Since the material was first reported by French scientist J.-M. LeMeins in 1999, it has been using a high-temperature solid-phase synthesis method, and high energy consumption has led to the high cost of the material. Zhao Junmei’s team has long been committed to the low-energy green synthesis of sodium vanadium fluorophosphate. Recently, after conducting a series of systematic studies on hydrothermal/solvothermal synthesis methods for sodium vanadium fluorophosphate, they further proposed that the sodium metavanadate solution obtained by extracting vanadium from vanadium slag was used as the raw material of vanadium to directly prepare sodium vanadium fluorophosphate. , Developed a convenient room temperature controllable preparation technology, which will greatly reduce the processing cost of the material. The researchers analyzed that the sodium vanadium fluorophosphate obtained by this method is a microsphere with a multi-shell microstructure. The formation mechanism is mainly based on the in-situ generated bubbles as a soft template, and the gas-liquid-solid interface occurs. The result of layered self-assembly. 'This research result will definitely accelerate the industrialization process of sodium vanadium fluorophosphate.' Zhao Junmei believes. It is reported that this is the first report on the one-step controllable synthesis of a polyanionic compound at room temperature, and it is also a challenge to the conventional high-temperature solid-phase method and hydrothermal synthesis method of positive electrode materials.
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