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Preparation method of lithium cobalt oxide-coated high-nickel ternary material

A high-nickel ternary material, lithium cobalt oxide technology, applied in the direction of electrical components, active material electrodes, electrochemical generators, etc., can solve the problems of unfavorable ternary material processing performance, deterioration of ternary material cycle and storage performance, etc. Achieve the effects of improving storage and cycle performance, improving rate performance and discharge capacity, and avoiding side reactions

Active Publication Date: 2019-08-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
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Problems solved by technology

[0003] At present, the main synthesis method of ternary materials is the solid-phase method, that is, the ternary precursor Ni prepared by co-precipitation x co y m 1-x-y (OH) 2 Mechanically mixed with lithium source and then sintered at high temperature. In the later stage of synthesis, the ternary material is exposed to the air, which will absorb moisture and carbon dioxide in the air, resulting in the formation of residual alkali on the surface of the material, and, with the increase of nickel content, the ternary material The water absorption continues to increase, and the residual alkali content on the surface continues to increase, and more residual alkali is not conducive to the processing performance of ternary materials, but also deteriorates the cycle and storage performance of ternary materials

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preparation example Construction

[0026] The preparation method of the lithium cobaltate-coated high-nickel ternary material of the present invention comprises the following steps, S1: weighing the precursor Ni of the high-nickel ternary material x co y m 1-x-y (OH) 2 and alkaline solution, where the precursor Ni x co y m 1-x-y (OH) 2 In 0.65≤x<1, 0<y≤0.20, the alkaline solution is an aqueous solution of one or more of the alkaline substances sodium hydroxide, potassium hydroxide or lithium hydroxide, the addition of the alkaline substance The amount is 2 to 5% of the total mass of the precursor of the high-nickel ternary material, and the weighed precursor and the alkaline solution are mixed evenly in a protective gas atmosphere, and the protective gas is nitrogen, helium, neon One or more of gas, argon, krypton and xenon, and then placed in a vacuum oven with a temperature controlled at 80-120°C for 5-12 hours to obtain a dry mixed powder;

[0027] S2: Put the above-mentioned dried mixed powder in the...

Embodiment 1

[0032] 100g high nickel ternary material precursor Ni 0.85 co 0.10 mn 0.05 (OH) 2 Mix with 50mL NaOH solution and stir to form a uniform slurry, wherein the mass of NaOH is 3% of the total mass of the precursor. Then, place the slurry in a vacuum oven at 100°C for 6 hours, and place the dried precursor in an ozone oxidation In the device, ozone gas with a humidity of 40% was introduced at a flow rate of 3 L / min for 1 h; secondly, the oxidized precursor was washed three times with deionized water at 50 ° C, and the precursor obtained after suction filtration was placed in 120 ℃ in a vacuum drying oven for 4 hours; finally, the dried precursor was mixed with lithium hydroxide at a ratio of 1:1.01, placed in a muffle furnace in an oxygen atmosphere, and the heating rate was controlled at 2°C / min. From room temperature to 780°C, heat preservation for 15h, and natural cooling to 100°C to obtain LiCoO 2 Coated high nickel ternary material.

[0033] LiCoO obtained above 2 Coate...

Embodiment 2

[0035] The precursor Ni of the mixed NaOH dried in embodiment 1 0.85 co 0.10 mn 0.05 (OH) 2 Placed in the ozone oxidation reaction device, with the flow rate of 3L / min, the ozone gas with a humidity of 40% was introduced for 2h, and the other steps were the same as in Example 1 to obtain LiCoO 2 Coated high nickel ternary material.

[0036] The positive electrode of the battery was produced and tested in the same steps as in Example 1. The electrochemical performance, moisture and residual alkali content of the product are shown in Table 2.

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Abstract

The invention provides a preparation method of a lithium cobalt oxide-coated high-nickel ternary material. The method comprises the following steps of: S1: taking and uniformly mixing a precursor of ahigh-nickel ternary material with an alkaline solution, and putting the mixture in a vacuum drying oven for drying to obtain mixed powder; S2: putting the dried mixed powder into an ozone oxidation reaction device, introducing ozone gases into the ozone oxidation reaction device, and performing stirring and oxidation; S3: washing the precursor in the step S2 by using hot deionized water, and drying the precursor after washing; and S4: uniformly mixing the dried precursor in the step S3 and a lithium source, and putting the mixture into a high-temperature furnace, performing temperature rise in an oxygen atmosphere in a sintering temperature from the room temperature to a sintering temperature, performing heat preservation, and performing natural cooling after heat preservation to obtain alithium cobalt oxide-coated high-nickel ternary material. The method employs the ozone oxidation method to perform oxidation for the Co2+ at the surface of the precursor to allow the surface of the precursor to generate structural recombination to generate a layer of CoOOH, and the precursor with the CoOOH at the surface is mixed with the lithium source for high-temperature calcinations to obtaina CoOOH-coated high-nickel ternary material.

Description

technical field [0001] The invention belongs to the technical field of positive electrode material preparation, and in particular relates to a preparation method of a high-nickel ternary material coated with lithium cobaltate. Background technique [0002] As a new type of green power source, lithium-ion batteries have been widely used in electric vehicles, energy storage power stations and electric tools due to their high voltage, high specific energy, green safety and environmental protection. In recent years, the market has increasingly higher requirements for the capacity and energy density of lithium-ion batteries. The early lithium iron phosphate batteries have been unable to meet market requirements. Under this background, major battery manufacturers have turned their attention to 523, 622 and High-nickel ternary batteries represented by 811, etc. Therefore, high-nickel ternary materials have attracted more and more attention, and have become a research hotspot in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 闵长青张二冬高玉仙李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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