The “Preparation Method of a Lithium Iron Phosphate/Vanadium Phosphate Composite Material†completed by researchers of the Xinjiang Institute of Physical and Chemical Technology of the Chinese Academy of Sciences obtained the national invention patent authorization (patent number: ZL201110219480.7).
As a kind of electrochemical energy source, lithium ion batteries have the advantages of high working voltage, light weight, high specific energy, small self-discharge, long cycle life, no memory effect, and less environmental pollution. At present, the cathode material has become the key factor that restricts the progress of lithium-ion battery technology. The performance of the cathode material affects the performance of the battery to a great extent, and directly determines the cost of the battery. In short, the issue of cathode materials has become a bottleneck problem for the entire lithium industry.
Researchers at Xinjiang Institute of Physics and Chemistry have invented a method for preparing a carbon-coated lithium iron phosphate/vanadium lithium phosphate composite material. The method uses iron phosphate and vanadium pentoxide as raw materials, iron phosphate, vanadium pentoxide and lithium. The salt compounds are mixed, a chelating agent is added, and the mixture is ground and mixed. After the heat treatment in an inert atmosphere, the carbon source material is added, heated and heated, and then calcined. After cooling to room temperature, a lithium iron phosphate/vanadium lithium phosphate composite material coated with carbon is obtained. The lithium iron phosphate/vanadium lithium phosphate composite material obtained by this method is assembled into a test battery with a current discharge specific capacity of 144 mAh/g at room temperature at 150 mA/g, and a current discharge specific capacity of 105 mAh/hr at 30 mA/g at -20°C/ g, complete crystal form, regular particle morphology, showing excellent room temperature and low temperature electrochemical performance.
The raw materials in the preparation method are bulk chemical raw materials, and the cost is low. The process route is simple and the industrial scale production is easy to realize. There is a very broad application prospect.
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