Preparation method of high-performance spherical lithium nickel cobalt aluminate anode material

Abstract

The invention relates to a preparation method of a high-performance spherical lithium nickel cobalt aluminate anode material. The preparation method comprises the following steps: dissolving aluminum salt in a sodium hydroxide solution; preparing a nickel salt aqueous solution, a cobalt salt solution, acetylacetone, a nickel-cobalt salt complexing agent, an ammonia-water solution and a precipitator solution for later use; adding the solutions into a reaction kettle at the same time by controlling molar weights of aluminum, nickel and cobalt, and controlling a molar ratio of aluminum salt to the acetylacetone and a molar ratio of nickel and cobalt salt to the nickel-cobalt complexing agent; at 30 to 80 DEG C, keeping the reaction for 20 to 80 hours, and performing aging reaction for 10 to 20 hours; centrifugally filtering reaction liquid, thus obtaining a preliminary filter cake, adding the preliminary filter cake into a sodium carbonate solution for stirring and washing, then performing centrifugal filtering, thus obtaining a secondary filter cake, then repeatedly washing and filtering the secondary filter cake with distilled water till the pH of filtrate is smaller than 9, and obtaining a final filter cake; drying the final filter cake, thus obtaining a precursor; mixing the precursor with lithium, sintering the precursor in a rotary sintering furnace under the existence of oxygen, thus obtaining the lithium nickel cobalt aluminate anode material.

Description

technical field

[0001] The invention relates to a method for preparing a high-performance spherical nickel-cobalt lithium aluminate cathode material, belonging to the field of lithium battery manufacturing. Background technique

[0002] As a new type of battery, lithium-ion batteries have the advantages of high voltage, large specific energy, long cycle life, stable discharge performance, good safety, no pollution, and wide operating temperature range. Great attention. However, the specific capacity of the positive electrode material of the lithium ion battery is much lower than that of the negative electrode material. Therefore, the way to increase the specific capacity of the lithium ion battery is the positive electrode material.

[0003] At present, the commercialized cathode materials mainly include lithium cobaltate, lithium iron phosphate, lithium manganate and ternary materials. Lithium cobalt oxide cathode material is the earliest commercial lithium-ion battery. A...

Examples

Embodiment 1

[0028] Weigh 500g aluminum nitrate nonahydrate, stir and dissolve in 13kg sodium hydroxide solution; weigh 5.6kg nickel sulfate and dissolve it in 10kg distilled water; weigh 1.15kg cobalt sulfate and dissolve it in 5kg distilled water; configure 0.2mol / L acetylacetone solution; L ammonia solution; 4mol / L sodium hydroxide solution for subsequent use.

[0029] Add the above-mentioned solutions to the CSTR reactor simultaneously and concurrently, control the molar ratio of nickel-cobalt-aluminum to 0.8:0.15:0.05, and simultaneously control the molar ratio of aluminum salt solution to acetylacetone to 1:0.3, and the molar ratio of nickel-cobalt salt to ammonia water The ratio is 1:1. Under the condition of 40° C., the feeding was continued for 40 h, and the aging reaction was carried out for 10 h after the feeding was completed. After centrifuging the reaction solution, obtain a primary filter cake, add the primary filter cake to a sodium carbonate solution with a mass fraction ...

Embodiment 2

[0031] Weigh 110g aluminum hydroxide solid, stir and dissolve in 12kg sodium hydroxide solution; weigh 5.35kg nickel sulfate and dissolve it in 9.8kg distilled water; weigh 1.26kg cobalt sulfate and dissolve it in 5.3kg distilled water; configure 0.2mol / L acetylacetone solution; 5mol / L ammonia solution; 4mol / L sodium hydroxide solution for later use.

[0032] Add the above-mentioned solutions to the CSTR reactor simultaneously and concurrently, control the molar ratio of nickel-cobalt-aluminum to 0.75:0.15:0.1, and control the molar ratio of the aluminum salt solution to acetylacetone to be 1:0.4 at the same time. The molar ratio is 1:1. Under the condition of 50° C., the feeding was continued for 30 h, and the aging reaction was carried out for 10 h after the feeding was completed. After centrifuging the reaction solution, obtain a primary filter cake, add the primary filter cake to a sodium carbonate solution with a mass fraction of 3% for stirring and washing, then perform...

Embodiment 3

[0034] Weigh 1.0kg aluminum nitrate nonahydrate, stir and dissolve in 18kg sodium hydroxide solution; weigh 12.3kg nickel sulfate and dissolve it in 21kg distilled water; weigh 2.4kg cobalt sulfate and dissolve it in 10kg distilled water; configure 0.3mol / L acetylacetone solution; 10mol / L ammonia solution; 4mol / L sodium hydroxide solution for later use.

[0035] Add the above-mentioned solutions to the CSTR reactor simultaneously and concurrently, control the molar ratio of nickel-cobalt-aluminum to 0.8:0.15:0.05, and simultaneously control the molar ratio of aluminum salt solution to acetylacetone to 1:0.4, and the molar ratio of nickel-cobalt salt to ammonia water The ratio is 1:0.5. Under the condition of 40° C., the feeding was continued for 80 h, and the aging reaction was carried out for 12 h after the feeding was completed. After centrifuging the reaction solution, obtain a primary filter cake, add the primary filter cake to a sodium carbonate solution with a mass frac...

technical field

[0001] The invention relates to a method for preparing a high-performance spherical nickel-cobalt lithium aluminate cathode material, belonging to the field of lithium battery manufacturing. Background technique

[0002] As a new type of battery, lithium-ion batteries have the advantages of high voltage, large specific energy, long cycle life, stable discharge performance, good safety, no pollution, and wide operating temperature range. Great attention. However, the specific capacity of the positive electrode material of the lithium ion battery is much lower than that of the negative electrode material. Therefore, the way to increase the specific capacity of the lithium ion battery is the positive electrode material.

[0003] At present, the commercialized cathode materials mainly include lithium cobaltate, lithium iron phosphate, lithium manganate and ternary materials. Lithium cobalt oxide cathode material is the earliest commercial lithium-ion battery. A...

Examples

Embodiment 1

[0028] Weigh 500g aluminum nitrate nonahydrate, stir and dissolve in 13kg sodium hydroxide solution; weigh 5.6kg nickel sulfate and dissolve it in 10kg distilled water; weigh 1.15kg cobalt sulfate and dissolve it in 5kg distilled water; configure 0.2mol / L acetylacetone solution; L ammonia solution; 4mol / L sodium hydroxide solution for subsequent use.

[0029] Add the above-mentioned solutions to the CSTR reactor simultaneously and concurrently, control the molar ratio of nickel-cobalt-aluminum to 0.8:0.15:0.05, and simultaneously control the molar ratio of aluminum salt solution to acetylacetone to 1:0.3, and the molar ratio of nickel-cobalt salt to ammonia water The ratio is 1:1. Under the condition of 40° C., the feeding was continued for 40 h, and the aging reaction was carried out for 10 h after the feeding was completed. After centrifuging the reaction solution, obtain a primary filter cake, add the primary filter cake to a sodium carbonate solution with a mass fraction ...

Embodiment 2

[0031] Weigh 110g aluminum hydroxide solid, stir and dissolve in 12kg sodium hydroxide solution; weigh 5.35kg nickel sulfate and dissolve it in 9.8kg distilled water; weigh 1.26kg cobalt sulfate and dissolve it in 5.3kg distilled water; configure 0.2mol / L acetylacetone solution; 5mol / L ammonia solution; 4mol / L sodium hydroxide solution for later use.

[0032] Add the above-mentioned solutions to the CSTR reactor simultaneously and concurrently, control the molar ratio of nickel-cobalt-aluminum to 0.75:0.15:0.1, and control the molar ratio of the aluminum salt solution to acetylacetone to be 1:0.4 at the same time. The molar ratio is 1:1. Under the condition of 50° C., the feeding was continued for 30 h, and the aging reaction was carried out for 10 h after the feeding was completed. After centrifuging the reaction solution, obtain a primary filter cake, add the primary filter cake to a sodium carbonate solution with a mass fraction of 3% for stirring and washing, then perform...

Embodiment 3

[0034] Weigh 1.0kg aluminum nitrate nonahydrate, stir and dissolve in 18kg sodium hydroxide solution; weigh 12.3kg nickel sulfate and dissolve it in 21kg distilled water; weigh 2.4kg cobalt sulfate and dissolve it in 10kg distilled water; configure 0.3mol / L acetylacetone solution; 10mol / L ammonia solution; 4mol / L sodium hydroxide solution for later use.

[0035] Add the above-mentioned solutions to the CSTR reactor simultaneously and concurrently, control the molar ratio of nickel-cobalt-aluminum to 0.8:0.15:0.05, and simultaneously control the molar ratio of aluminum salt solution to acetylacetone to 1:0.4, and the molar ratio of nickel-cobalt salt to ammonia water The ratio is 1:0.5. Under the condition of 40° C., the feeding was continued for 80 h, and the aging reaction was carried out for 12 h after the feeding was completed. After centrifuging the reaction solution, obtain a primary filter cake, add the primary filter cake to a sodium carbonate solution with a mass frac...

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