Aluminum-phosphate coated lithium-nickel-cobalt-aluminate positive electrode material and preparation method thereof
A technology of nickel-cobalt-lithium-aluminate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of reduced discharge capacity, poor structural stability, material cycle life and safety hazards, etc. Achieve the effects of improving cycle life and safety performance, solving precipitation problems, and thin and uniform coating layer
Inactive Publication Date: 2019-07-05
JINGMEN GEM NEW MATERIAL +1
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Abstract
The invention discloses an aluminum-phosphate coated lithium-nickel-cobalt-aluminate positive electrode material. The chemical expression of the material is LiaNixCoyAlzPcO2, wherein a is greater thanor equal to 1 and less than or equal to 1.2, x is greater than or equal to 0.3 and less than or equal to 0.98, y is greater than or equal to 0.01 and less than or equal to 0.6, z is greater than or equal to 0.001 and less than or equal to 0.2, b is greater than or equal to 0.00001 and less than or equal to 0.03, and c is greater than or equal to 0.001 and less than or equal to 0.01. The inventionalso discloses a preparation method of the positive electrode material. Soluble aluminum salt is used as an Al source, soluble phosphate is used as a precipitant, and a layer of AlPO4 coating layer is uniformly plated on the surface of a positive electrode material by controlling a crystallization chemical plating method. The method is simple and easy to operate, the coating amount of AlPO4 can be accurately controlled, and the precipitation problem is solved by a surfactant in the coating process, thereby enabling the coating layer to be thin and uniform, prolonging the cycle life of the positive electrode material, and improving the safety performance of the positive electrode material.
Application Domain
Cell electrodesSecondary cells
Technology Topic
Chemical platingCobalt aluminate +11
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