Gradient-doped cobalt-free cathode material and preparation method thereof, lithium-ion battery cathode and lithium battery
A technology for lithium-ion batteries and positive electrode materials, which is applied to battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as demanding roasting conditions, and achieve simple and easy preparation methods, simple roasting conditions, and excellent cycle performance. Effect
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[0065] The second aspect of the present invention provides a method for preparing a gradiently doped cobalt-free positive electrode material, wherein the method includes:
[0066] (1) performing the first roasting treatment after first mixing the lithium salt, the precursor and the first additive to obtain the first material;
[0067] (2) performing a second roasting treatment after the first material and the second additive are mixed to obtain a second material;
[0068] (3) crushing and sieving the second material to obtain a gradient doped cobalt-free positive electrode material;
[0069] Wherein, the expression of described precursor is Ni x1 mn y1 (OH) 2 , 0.55≤x 1 ≤0.95; 0.05≤y 1 ≤0.45;
[0070] Wherein, the first additive and the second additive are the same, each selected from ZrO 2 、Al 2 o 3 、TiO 2 , Zr(OH) 4 , Al(OH) 3 、H 3 BO 3 and WO 3 one or more of.
[0071] According to the present invention, in step (1), the weight ratio of the lithium salt, the...
Embodiment 1
[0090] This example is to illustrate the cobalt-free cathode material prepared by the method of the present invention.
[0091](1) Mixing of raw materials: 100g of LiOH, 210g of precursor Ni 0.75 mn 0.25 (OH) 2 , 0.45g of additive Al 2 o 3 High-speed mixing equipment is used for mixing, the mixing time is 15min, and the rotation speed of 100L equipment is 850rpm; the material filling efficiency in the equipment is 50%;
[0092] (2) The first roasting: react the mixed materials in an oxygen atmosphere (concentration greater than 90%) at 550°C for 5 hours, with a heating rate of 3°C / min, and naturally cool down;
[0093] (3) Mixing for the second time: 220g of the material after the first roasting and 0.90g of the additive Al 2 o 3 Mixing, the mixing time is 10min, and the speed of 100L equipment is 950rpm;
[0094] (4) The second roasting: react the second mixed material at a high temperature of 950° C. for 15 hours, the heating rate is 3° C. / min, cool down naturally, an...
Embodiment 2
[0102] This example is to illustrate the cobalt-free cathode material prepared by the method of the present invention.
[0103] (1) Mixing of raw materials: 100g of LiOH, 205g of precursor Ni x mn y (OH) 2 , x=0.55, y=0.45; The additive ZrO of 0.60g 2 High-speed mixing equipment is used for mixing, the mixing time is 10min, and the speed of 100L equipment is 800rpm; the material filling efficiency in the equipment is 30%;
[0104] (2) The first roasting: react the mixed material in an oxygen atmosphere (concentration greater than 90%) at 500°C for 6h, the heating rate is 2°C / min, and cool down naturally;
[0105] (3) mixing for the second time: the material of 215g after the first roasting and the additive ZrO of 1.25g 2 Mixing, the mixing time is 8min, and the speed of 100L equipment is 900rpm;
[0106] (4) The second roasting: react the second mixed material at a high temperature of 900° C. for 12 hours, the heating rate is 2° C. / min, cool down naturally, and sieve thro...
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