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The Institute of Process Engineering of the Chinese Academy of Sciences synthesized sodium vanadium fluorophosphate, a high-voltage cathode material for 14500 battery, for the first time.
Recently, reporters learned from the Institute of Process Engineering of the Chinese Academy of Sciences that Zhao Junmei’s team, an associate researcher at the Institute’s Green Chemical Research Department, developed a low-cost and convenient room temperature controllable technology for polyanionic compounds, and for the first time synthesized fluorine, a high-voltage cathode material for 14500 battery. Sodium vanadium phosphate, this material has excellent rate performance and long cycle performance without any post-processing. It can be said that laboratory research on sodium vanadium fluorophosphate has reached the international leading level. The research results were recently published in "Joule", the energy flagship journal of "Cell" Press.
In view of the constraints on the future development of lithium ions such as the high price of lithium resources and limited geological reserves, 14500 battery, which have similar working principles to lithium-ion batteries, have high hopes. "The reserves of sodium in the earth's crust are much higher than those of lithium, which is expected to support the sustainable development of large-scale energy storage technology." Zhao Junmei told a reporter from China Science News.
The large-scale and low-cost preparation of an important type of sodium-ion battery cathode material "polyanionic sodium fluorovanadium phosphate" is restricting its commercialization process. This type of material has an energy density of up to 480Wh/kg. If sodium vanadium fluorophosphate can be applied industrially, the energy density of the full battery can be comparable to that of lithium-ion batteries. Since this material was first reported by French scientist J.-M. LeMeins in 1999, high-temperature solid-phase synthesis methods have been used. High energy consumption has led to the high cost of this material.
Zhao Junmei’s team has long been committed to the low-energy green synthesis of sodium vanadium fluorophosphate. Recently, after conducting systematic research on a series of hydrothermal/solvothermal synthesis methods for sodium vanadium fluorophosphate, they further proposed to use the sodium metavanadate solution obtained by extracting vanadium from vanadium slag 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 this material.
According to the researchers, the sodium vanadium fluorophosphate obtained through this method is a microsphere with a multi-shell microstructure. Its formation mechanism is mainly based on the bubbles generated in situ as a soft template, and the gas-liquid-solid interface occurs. The result of layer-by-layer 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 controllable synthesis of a polyanionic compound at room temperature. It is also a challenge to conventional high-temperature solid-phase methods and hydrothermal synthesis methods of cathode materials.
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