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
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[0034] Example 1
[0035] A method for preparing aluminum phosphate-coated lithium nickel cobalt aluminate cathode material is specifically implemented according to the following steps:
[0036] Add 1000g of nickel-cobalt-aluminum lithium nickel-cobalt aluminate with a molar ratio of 80:15:5 to 3000g of water, stir fully at a speed of 50r / min, and press AlPO 4 The coating amount is 0.5%, Al:PO 4 3- =1:1.1 At the same time, add the aluminum sulfate and ammonium dihydrogen phosphate solutions with the concentrations of 0.05mol / L and 0.1mol / L respectively in parallel, and ensure that the addition is completed within 0.5h, filtered, dried, and heat treated at 450℃ in an air atmosphere 5h, the AlPO4 coated lithium nickel cobalt aluminate cathode material was obtained.
[0037] With the above materials as the positive electrode and the metal lithium sheet as the negative electrode, a button cell was assembled to conduct a charge and discharge comparison test. The positive electrode materia...
Example Embodiment
[0038] Example 2
[0039] A method for preparing aluminum phosphate-coated lithium nickel cobalt aluminate cathode material is specifically implemented according to the following steps:
[0040] Add 1000g of nickel-cobalt-aluminum lithium nickel-cobalt aluminate with a molar ratio of 89:8:3 to 5000g of water, stir fully at a speed of 50r / min, and press AlPO 4 The coating amount is 0.1%, Al:PO 4 3- ==1:1.1 At the same time, add aluminum sulfate and ammonium dihydrogen phosphate solutions with concentrations of 0.05mol / L and 0.1mol / L respectively in parallel, and ensure that the addition is completed within 1.5h, filtered, dried, and placed at 480℃ in an air atmosphere. Heat treatment for 5 hours to obtain AlPO4 coated lithium nickel cobalt aluminate cathode material.
[0041] Using the above-mentioned materials as the positive electrode and the metal lithium sheet as the negative electrode, a button cell was assembled to conduct a charge-discharge comparison test. The positive electro...
Example Embodiment
[0042] Example 3
[0043] A method for preparing aluminum phosphate-coated lithium nickel cobalt aluminate cathode material is specifically implemented according to the following steps:
[0044] Add 1000g nickel-cobalt-aluminum lithium nickel-cobalt aluminate with a molar ratio of 85:10:5 to 6000g water, stir fully at a speed of 50r / min, and press AlPO 4 The coating amount is 0.2%, Al:PO 4 3- ==1:1.1 At the same time, add aluminum sulfate and ammonium dihydrogen phosphate solutions with concentrations of 0.05 mol / L and 0.1 mol / L in parallel, and ensure that the addition is completed within 1.5 hours, filter, dry, and place at 455°C in an air atmosphere Heat treatment for 4h to obtain AlPO4 coated lithium nickel cobalt aluminate cathode material.
[0045] Using the above-mentioned materials as the positive electrode and the metal lithium sheet as the negative electrode, a button cell was assembled to conduct a charge-discharge comparison test. The positive electrode material obtained ...
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