Method for preparing nanocrystal lithium iron phosphate anode material through co-precipitation

Abstract

The invention discloses a method for preparing a nanocrystal lithium iron phosphate anode material through co-precipitation, which comprises the following steps of: 1, mixing crude materials, and stirring at high speed to obtain a precursor solution; 2, standing the precursor solution, cleaning, filtering and drying to obtain precursor powder; 3, adding an organic carbon source into the precursor powder and uniformly blending, and drying obtain the precursor powder which is coated by the organic carbon source; 4, roasting and cooling to obtain the organic carbon-coated nanocrystal lithium iron phosphate anode material; 5, mixing an inorganic carbon source with an anode material, adding adhesive and uniformly stirring to obtain an anode sizing agent; and 6, coating the anode sizing agent onto an aluminum foil substrate, drying and pressing to obtain a carbon-coated nanocrystal lithium iron phosphate anode material. With the adaption of the carbon-coated nanocrystal lithium iron phosphate anode material prepared by the method disclosed by the invention, assembled button half-cells have excellent chemical properties. The first discharge capacity achieves 155 mAh/g to 165 mAh/g at 0.1C; and a discharge platform is flat and about 3.4 V.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing nanocrystalline lithium iron phosphate positive electrode materials by co-precipitation. Background technique [0002] Under the dual pressure of energy crisis and environmental protection, countries all over the world have set goals for energy conservation and emission reduction, and adopted effective measures to achieve green economic development, and finally realize the transformation of economic structure and the transformation of low-carbon economy. Lithium iron phosphate material is recognized by the international power supply industry as the most promising cathode material for lithium-ion power and energy storage batteries because of its good safety performance, long cycle life, rich resources, and environmental friendliness. The development of the energy industry is of great significance, and the market prospect and social ...

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Problems solved by technology

[0004] In the synthesis method of liquid phase synthesis of lithium iron phosphate, the invention patent with the patent publication number ZL100431207C is to precipitate the precursor of metal cations from the solution, and then obtain the lithium iron phosphate cathode material by heat treatment at 300 ° C ~ 1000 ° C. The method cannot precipitate a variety of metal cations at the same speed to obtain an amorphous ultrafine precursor powder, so it is difficult to obtain a nanocrystalline lithium iron phosphate cathode material in the subsequent heat treatment process

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