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Preparation method of nickel-cobalt-aluminum ternary precursor and preparation method of positive electrode material

A positive electrode material, nickel-cobalt-aluminum technology, applied in the field of preparation of nickel-cobalt-aluminum ternary precursors and positive electrode materials, can solve problems such as poor structural stability, low discharge capacity, complicated process, etc., to improve discharge specific capacity and cycle performance , high specific surface area and porous characteristics, the effect of improving uniformity

Pending Publication Date: 2018-04-10
OPTIMUM BATTERY CO LTD
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  • Description
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Problems solved by technology

However, the current nickel-cobalt-aluminum ternary precursor needs to be prepared by multi-step co-precipitation method, which is complicated and difficult to control. At the same time, it needs to add a variety of precipitants or complexing agents, which is easy to cause environmental pollution. The nickel-cobalt lithium aluminate cathode material is still There are disadvantages such as poor structural stability and low discharge capacity

Method used

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  • Preparation method of nickel-cobalt-aluminum ternary precursor and preparation method of positive electrode material
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  • Preparation method of nickel-cobalt-aluminum ternary precursor and preparation method of positive electrode material

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preparation example Construction

[0023] The invention provides a method for preparing a nickel-cobalt-aluminum ternary precursor, comprising the following steps:

[0024] 1) nickel nitrate, cobalt nitrate, aluminum nitrate are dissolved in deionized water to prepare an aqueous solution, the total concentration of nickel, cobalt and aluminum in the aqueous solution is 0.5~2.5mol / L, Ni:Co:Al molar ratio is x: y: (1-x-y), where 0.7≤x≤0.8, 0.15≤y≤0.25;

[0025] 2) ultrasonically disperse the aqueous solution for 5 min, then add isopropanol and stir at room temperature for 1 h to prepare a mixed metal salt solution, add a low-carbon alcohol solvent to the mixed metal salt solution and stir at room temperature for 1 h, Prepare mixed reaction solution;

[0026] 3) Add the mixed reaction liquid into the reaction kettle for reaction, react continuously at 120-140°C for 6-12h, then cool to room temperature, centrifuge to obtain the precipitate, wash and dry in vacuum at 80°C for 24h, A nickel-cobalt-aluminum ternary ...

Embodiment 1

[0034] In this embodiment, a method for preparing a nickel-cobalt-aluminum ternary precursor comprises the following steps: respectively weighing 0.008 mol of nickel nitrate and 0.0015 mol of Cobalt nitrate and 0.0005 mol of aluminum nitrate were dissolved in 10 mL of deionized water to prepare an aqueous solution. The aqueous solution was ultrasonically dispersed for 5 minutes, and then 50 mL of isopropanol was added and magnetically stirred at room temperature for 1 hour to prepare a mixed metal salt solution. 15 mL of methanol was added to the mixed metal salt solution and magnetically stirred at room temperature for 1 h to prepare a mixed reaction solution.

[0035] The mixed reaction solution was added to a 100mL reaction kettle for reaction, and the reaction was continued at 120°C for 8h, then cooled to room temperature, and centrifuged to obtain a precipitate, which was washed three times with deionized water and absolute ethanol alternately. Vacuum-dried at 80°C for 24...

Embodiment 2

[0038]In this embodiment, a method for preparing a nickel-cobalt-aluminum ternary precursor comprises the following steps: Weighing 0.007 mol of nickel nitrate and 0.002 mol of Ni Cobalt nitrate and 0.001 mol of aluminum nitrate were dissolved in 5 mL of deionized water to prepare an aqueous solution. The aqueous solution was ultrasonically dispersed for 5 minutes, and then 60 mL of isopropanol was added and magnetically stirred at room temperature for 1 hour to prepare a mixed metal salt solution. 10 mL of methanol was added to the mixed metal salt solution and magnetically stirred at room temperature for 1 h to prepare a mixed reaction solution.

[0039] The mixed reaction solution was added to a 100mL reaction kettle for reaction, and the reaction was continued at 140°C for 6h, then cooled to room temperature, and centrifuged to obtain a precipitate, which was washed three times with deionized water and absolute ethanol alternately. Vacuum-dried at 80°C for 24 hours to obta...

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Abstract

The invention provides a preparation method of a nickel-cobalt-aluminum ternary precursor. Nickel nitrate, cobalt nitrate and aluminum nitrate are dissolved in deionized water to prepare an aqueous solution, the aqueous solution is ultrasonically dispersed for 5 min, then isopropyl alcohol is added and stirred at room temperature for 1 h, a mixed metal salt solution is prepared, a low-carbon alcohol solvent is added into the mixed metal salt solution and stirred at room temperature for 1 h, and a mixed reaction solution is prepared and obtained; the mixed reaction solution is added into a reaction still for a reaction, the reaction is continuously conducted at 120-140 DEG C for 6-12 h, then the temperature is reduced to the room temperature by cooling, centrifugal separation is conducted to obtain precipitate, and the precipitate is washed and dried under vacuum at 80 DEG C for 24 h to obtain the nickel-cobalt-aluminum ternary precursor. The invention further provides a preparation method of a nickel-cobalt-aluminum ternary positive electrode material. The nickel-cobalt-aluminum ternary precursor is prepared by means of the method above, and the precursor and an inorganic lithium source are evenly ground and mixed, placed in a tubular resistance furnace, calcined in the atmosphere of oxygen, cooled, crushed and sieved to obtain the nickel-cobalt-aluminum ternary positive electrode material.

Description

【Technical field】 [0001] The invention belongs to the technical field of battery positive electrode materials, and in particular relates to a nickel-cobalt-aluminum ternary precursor and a preparation method of the positive electrode material. 【Background technique】 [0002] Due to the advantages of high energy density, long service life, no memory effect and environmental friendliness, lithium-ion batteries are widely used in electronic products, electric vehicles and aviation and other fields. The positive electrode material is the key material that determines the capacity of lithium-ion batteries. With the development of electrode materials, battery positive electrode materials with different characteristics have emerged one after another, such as lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, and nickel-cobalt-manganese. Ternary materials, etc. However, the current mature battery materials are difficult to meet the requirements of power...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCH01M4/525Y02E60/10
Inventor 陈高文田雷雷饶睦敏
Owner OPTIMUM BATTERY CO LTD
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