A kind of core-shell structure ternary cathode material and preparation method thereof
A technology of positive electrode material and core-shell structure is applied in the field of core-shell structure ternary positive electrode material and its preparation, which can solve the problems of inability to comprehensively improve the electrochemical performance of the material, the high capacitance of the layered structure, the problem of material dispersion, and the like, Achieve the effect of improving cycle stability, rate and cycle performance, and material properties
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[0059] According to another aspect of the present invention, there is provided a method for preparing the above-mentioned core-shell structure ternary positive electrode material, the preparation method comprising the following steps:
[0060] Step (1), preparation of nucleosome
[0061] The core body is prepared by the following method:
[0062] The nickel-cobalt-manganese ternary precursor and the lithium source are respectively sieved and mixed, and then calcined and sieved to obtain the core body.
[0063] In the above step (1), the nucleosome is represented by the formula Li x Ni 0.5 mn 0.3 co 0.2 o 2 express:
[0064] Among them, 1≤x≤1.1, preferably 1
[0065] Preferably, in step (1), the nickel-cobalt-manganese ternary precursor is nickel-cobalt-manganese hydroxide, more preferably Ni 0.5 co 0.2 mn 0.3 (OH) 2 .
[0066] Preferably, in step (1), the lithium source is lithium carbonate, lithium acetate or lithium hydroxide, more preferably lithium carb...
Embodiment 1
[0097] Example 1 Preparation of core-shell structure ternary cathode material (1)
[0098] 60g Li x Ni 0.5 mn 0.3 co 0.2 o 2 Add 100ml of ethanol, stir evenly, add 100ml of deionized water, adjust the temperature to 40°C, and stir for 0.5h. The mixed dispersion was ultrasonicated for 1 h, and stirred for 0.5 h. Add 0.4951g of lithium acetate and 1.4871g of manganese acetate into the above mixed dispersion and stir for 1 hour, then raise the temperature to 80°C, and continue stirring until the deionized water is basically evaporated to dryness. The obtained product is transferred to an oven for drying, passed through a 100-500 mesh sieve, calcined at 300° C. for 2 hours, and 450° C. for 5 hours, and passed through a 100-500 mesh sieve to obtain the final product.
Embodiment 2
[0099] Example 2 Preparation of core-shell structure ternary cathode material (two)
[0100] 60g Li x Ni 0.5 mn 0.3 co 0.2 o 2 Add 100ml of ethanol, stir evenly, add 100ml of deionized water, adjust the temperature to 40°C, and stir for 0.5h. The mixed dispersion was ultrasonicated for 1 h, and stirred for 0.5 h. Add 1.4854g of lithium acetate and 4.4612g of manganese acetate into the above mixed dispersion and stir for 1 hour, then raise the temperature to 80°C until the deionized water is basically evaporated to dryness. The obtained product is transferred to an oven for drying, passed through a 100-500 mesh sieve, calcined at 300° C. for 2 hours, and 450° C. for 5 hours, and passed through a 100-500 mesh sieve to obtain the final product.
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Abstract
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