Preparation method of N-doped mesoporous carbon-coated ternary cathode material of lithium ion battery

Abstract

The invention provides a preparation method of an N-doped mesoporous carbon-coated ternary cathode material of a lithium ion battery. The preparation method comprises the following steps: (1) performing ultrasonic dispersion on a ternary cathode material into water, adding a phenylamine monomer, performing ultrasonic dispersion and adding acid solution, so as to obtain precursor solution; (2) adding ammonium persulfate solution into the precursor solution, heating and stirring the mixture, washing and settling twice or more than twice after centrifugal separation and performing vacuum drying,so as to obtain a polyaniline-coated ternary cathode material of the lithium ion battery; (3) placing the polyaniline-coated ternary cathode material into a tube furnace, calcining the polyaniline-coated ternary cathode material in an inert atmosphere, and naturally cooling to room temperature, so as to obtain the N-doped mesoporous carbon-coated ternary cathode material. The particle size of theN-doped mesoporous carbon-coated ternary cathode material of the lithium ion battery, which is obtained by the method, is 5-15mum, and an N-doped mesoporous carbon-coated layer is uniform and is 3-20nm in thickness; the N-doped mesoporous carbon-coated ternary cathode material is assembled into the battery and has comparatively good cycling stability and large rate discharge performance. The method is low in cost and simple in process, therefore, the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of a carbon-coated lithium-ion battery ternary cathode material, in particular to a preparation method of a nitrogen-doped mesoporous carbon-coated lithium-ion battery ternary cathode material. Background technique [0002] From mobile devices to electric vehicles, with the continuous expansion of energy storage system applications, the demand for high-energy-density lithium-ion batteries is also increasing, and the cathode materials in lithium-ion batteries should meet such requirements as high energy density, long cycle life and An important criterion for thermal stability over a wide temperature range. In particular, nickel-rich high-capacity cathode materials such as LiNi 1-x- y co x m y o 2 (M = Mn, Al; x + y < 0.5), due to the advantages of high capacity and low price, this type of material has attracted extensive attention for its application in lithium-ion batteries. Although higher Ni cont...

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Problems solved by technology

[0003] For example, CN103000874A discloses a method for preparing a carbon-coated ternary positive electrode material, and CN104900869A discloses a method for preparing a carbon-coated nickel-cobalt-aluminum ternary positive electrode material, both of which are coated with an ordinary organic carbon source; CN103474628A discloses A method for preparing a carbon-coated nickel-cobalt-aluminum ternary positive electrode material, however, the coated amorphous carbon has poor electrical conductivity; and CN104466135A discloses a conductive polymer-coated nickel-cobalt-aluminum lithium manganate positive electrode material The method is to directly add a conductive polymer and then calcine to obtain a carbon coating layer. However, due to the technical defects of the process, the coating layer is not uniform

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