A kind of ternary cathode material with coated porous structure and preparation method thereof
A technology of positive electrode material and porous structure, which is applied in the field of ternary positive electrode material with coated porous structure and its preparation, which can solve the problems of increasing the surface impedance of ternary material and the small specific capacity of the material for the first discharge, and achieve long cycle stability. , Improving the rate performance and the effect of high charge-discharge specific capacity
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[0043] A method for preparing a ternary positive electrode material with a coated porous structure, comprising the following steps 1) preparing a multi-component mixed solution of nickel salt, cobalt salt and manganese salt; the nickel salt is nickel nitrate, nickel chloride, nickel acetate, At least one of nickel sulfate; the manganese salt is at least one of manganese nitrate, manganese chloride, manganese acetate, manganese sulfate; the cobalt salt is cobalt nitrate, cobalt chloride, cobalt acetate, cobalt sulfate At least one of them; the total ion concentration of the multivariate mixed solution obtained in the step 1) is 1mol / L-1.5mol / L.
[0044] 2) The carbon source is hydrothermally reacted to obtain a carbon sphere precursor, and the carbon sphere precursor is sintered to obtain carbon spheres, and the obtained carbon spheres or carbon nanotubes are directly immersed in the multi-component mixed solution in step 1);
[0045] 3) Add the mixed solution obtained in step ...
Embodiment 1
[0054] Prepare a sulfate solution with a total metal ion concentration of 1.5mol / L (Ni:Co:Mn=8:1:1), first weigh 2g of glucose and dissolve it in deionized water, and obtain hard carbon by hydrothermal reaction and heat treatment microspheres and disperse them in the mixed solution. Flow the above mixed solution together with ammonia water and sodium hydroxide into a reaction kettle containing a mixture of sodium hydroxide and ammonia water, adjust the rotation speed of the reaction kettle to 300r / min, and the temperature to 55 degrees. Adjust the ammonium root concentration of the mother liquor to 6-8g / L, and the pH to 12, so that the components that have been mixed uniformly in the solution are co-precipitated according to the chemical dosage ratio. Then take lithium hydroxide: the precursor = 1.05:1, pre-sinter at 400-450°C for 2 hours in an oxygen atmosphere, and then heat up to 800-1000°C for 15 hours to obtain a porous spherical ternary material core.
[0055] Immerse t...
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