Lithium ion battery positive electrode material with layered structure, preparation method and lithium ion battery
A lithium-ion battery, layered structure technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as incomplete precipitation of aluminum elements, achieve easy preparation methods, high reactivity, and suppress the generation of microcracks Effect
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[0026] According to a second aspect of the present invention, there is provided a method for preparing a layered lithium-ion battery cathode material, comprising the steps of:
[0027] Step 1, preparation of the mixed solution: Weigh the nickel source compound and the cobalt source compound according to the stoichiometric ratio of the inner layer of the material, and dissolve them in deionized water to make a mixed solution I of 0.5-2mol / L; mix the nickel source compound , Cobalt source compound and manganese source compound are weighed according to the stoichiometric ratio of the outer layer of the material, and dissolved in deionized water to make a mixed solution II of 0.5-2mol / L;
[0028] Step 2, preparation of precipitant solution: use deionized water to prepare soluble precipitant, the amount of soluble alkali included in it is 1 to 1.2 times the stoichiometric amount, and the solubility is 0.5 to 2mol / L;
[0029] Step 3, two-step co-precipitation method to prepare spher...
Embodiment 1
[0040] Prepare the solution according to the ratio of Ni:Co:Al in the inner molecular structure of 0.9:0.05:0.05, and the ratio of Ni:Co:Mn:Al in the outer molecular structure of 0.85:0.05:0.05:0.05. First, nickel sulfate, manganese sulfate, cobalt sulfate and deionized water were used to prepare mixed solution I and mixed solution II with a total concentration of 2mol / L, wherein the molar ratio of nickel and cobalt in mixed solution I was 0.9:0.05, mixed The molar ratio of nickel, cobalt and manganese in solution II is 0.85:0.05:0.05.
[0041] Sodium hydroxide with a stoichiometric amount of 1.2 times is dissolved in deionized water to prepare a precipitant with a concentration of 2mol / L, and a complexing agent ammonia water is added to the precipitant. The mass ratio of ammonia water to sodium hydroxide is 1:100 .
[0042] Under a nitrogen atmosphere, the mixed solution I and the precipitant were introduced into the batch reactor with a peristaltic pump, and the co-precipit...
Embodiment 2
[0048] Prepare the solution according to the ratio of Ni:Co:Al in the inner molecular structure of 0.92:0.03:0.05, and the ratio of Ni:Co:Mn:Al in the outer molecular structure of 0.86:0.04:0.05:0.05. First, nickel sulfate, manganese sulfate, cobalt sulfate and deionized water were used to prepare mixed solution I and mixed solution II with a total concentration of 1mol / L, wherein the molar ratio of nickel and cobalt elements in mixed solution I was 0.92:0.03, mixed The molar ratio of nickel, cobalt and manganese in solution II is 0.86:0.04:0.05.
[0049] Dissolve potassium hydroxide of 1.2 times the stoichiometric amount in deionized water to prepare a precipitant with a concentration of 1mol / L, and add complexing agent ammonia water to the precipitant, the mass ratio of ammonia water to sodium hydroxide is 1:100 .
[0050] Under a nitrogen atmosphere, introduce the mixed solution I and the precipitating agent into the batch reactor with a peristaltic pump, react at a stirri...
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