Introduction: After conducting a series of hydrothermal / solvothermal synthesis methods for sodium vanadium fluorophosphate, they further proposed that the sodium metavanadate solution obtained by vanadium slag extraction and extraction of vanadium 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 production cost of the material.
Image courtesy of Process Engineering of Chinese Academy of Sciences
Recently, the reporter learned from the Institute of Process Engineering of the Chinese Academy of Sciences that Zhao Junmei, an associate researcher of the Institute of Green Chemical Research of the Institute, developed a low-cost and convenient room-temperature control technology for polyanion compounds, and for the first time synthesized a high-voltage cathode material fluoride for sodium ion batteries Sodium vanadium phosphate, this material has excellent rate performance and long cycle performance without any post-treatment. It can be said that laboratory research on sodium vanadium fluorophosphate has reached the international advanced level. The research results were recently published in Joule, the flagship energy journal of Cell Press.
In view of the restrictions on the future development of lithium ions due to the high price of lithium resources and limited geological reserves, sodium ion batteries with similar working principles as lithium ion batteries are expected to have high hopes. "The storage of sodium in the earth's crust is much higher than that of lithium, and it is expected to support the sustainable development of large-scale energy storage technology." Zhao Junmei told a reporter from China Science Daily.
The large-scale and low-cost preparation of an important sodium ion battery cathode material "polyanion compound sodium vanadium fluorophosphate" is restricting its commercialization process. This type of material has an energy density of up to 480 Wh / kg. If the sodium vanadium fluorophosphate can be industrially applied, 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. Le Meins in 1999, the high-temperature solid-phase synthesis method has been used. The high energy consumption has led to the high cost of the material.
The Zhao Junmei team has long been committed to the low-energy green synthesis of sodium vanadium fluorophosphate. Recently, after conducting a series of hydrothermal / solvothermal synthesis methods for sodium vanadium fluorophosphate, they further proposed that the sodium metavanadate solution obtained by vanadium slag extraction and extraction of vanadium 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 production cost of the material.
The researchers introduced that the sodium vanadium fluorophosphate obtained by this method is a microsphere with a multi-shell microstructure. Its 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 layers of 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 of a one-step controlled 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 of cathode materials.
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