Ni-Co-Mn ternary precursor and preparation method thereof

A nickel-cobalt-manganese ternary and precursor technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of inability to meet the high-rate charge and discharge performance of power batteries, small contact area, and small specific surface area. The preparation method is simple and easy to operate, the specific surface area is increased, and the specific surface area is high.

Active Publication Date: 2017-05-17
JINGMEN GEM NEW MATERIAL +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inheritance of the positive electrode material to the precursor, the primary particles of the fired nickel-cobalt lithium manganate (LNCM) positive electrode material are also large, the specific surface a

Method used

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  • Ni-Co-Mn ternary precursor and preparation method thereof
  • Ni-Co-Mn ternary precursor and preparation method thereof

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preparation example Construction

[0027] In a first aspect, the present invention provides a method for preparing a nickel-cobalt-manganese ternary precursor, comprising:

[0028] (1) according to the molar ratio of nickel, cobalt and manganese metal ion, be the ratio of 1:1:1 to prepare the mixed salt solution containing nickel salt, cobalt salt and manganese salt, add oxidizing agent in mixed salt solution, after stirring, obtain Mixed solution; the quality of the oxidizing agent is 0.1%-10% of the total mass of nickel, cobalt and manganese in the mixed salt solution; the oxidizing agent is potassium permanganate, sodium thiosulfate, sodium peroxide, chlorine gas, perchloric acid , sodium perchlorate, chloric acid, sodium chlorate, hypochlorous acid, sodium hypochlorite and hydrogen peroxide;

[0029] (2) Add the mixed solution, lye and ammonia solution into the reaction kettle in parallel, and react at 40°C-80°C for 15h-26h to generate a slurry containing nickel-cobalt-manganese ternary precursor;

[0030]...

Embodiment 1

[0062] A preparation method of a nickel-cobalt-manganese ternary precursor, comprising:

[0063] (1) Prepare a mixed salt solution containing nickel sulfate, cobalt sulfate and manganese sulfate in a ratio of 1:1:1 according to the molar ratio of nickel, cobalt and manganese metal ions. In the mixed salt solution, three metals of nickel, cobalt and manganese The total molar concentration of ions is 2mol / L; In the mixed salt solution, adding the sodium chlorate solution whose concentration is 2g / L, the quality of sodium chlorate is 10% of the total mass of nickel, cobalt and manganese three kinds of metal ions in the mixed salt solution %;

[0064] (2) Add the mixed solution, the lye with a concentration of 4mol / L and the aqueous ammonia solution with a concentration of 6mol / L according to the flow ratio of 2:2:1 into the reaction kettle in parallel through a constant flow pump, and simultaneously Continue to feed nitrogen, the flow rate of nitrogen is 0.3m 3 / h, react at 80°...

Embodiment 2

[0068] A preparation method of a nickel-cobalt-manganese ternary precursor, comprising:

[0069] (1) Prepare a mixed salt solution containing nickel sulfate, cobalt sulfate and manganese sulfate in a ratio of 1:1:1 according to the molar ratio of nickel, cobalt and manganese metal ions. In the mixed salt solution, three metals of nickel, cobalt and manganese The total molar concentration of ions is 2mol / L; Adding the sodium chlorate solution that concentration is 1g / L in the mixed salt solution, the quality of sodium chlorate is nickel, cobalt, manganese three kinds of metal ions total mass 2 in the mixed salt solution %;

[0070] (2) Add the mixed solution, the lye with a concentration of 4mol / L and the aqueous ammonia solution with a concentration of 6mol / L according to the flow ratio of 2:2:1 into the reaction kettle in parallel through a constant flow pump, and simultaneously Continue to feed nitrogen, the flow rate of nitrogen is 5.0m 3 / h, react at 40°C for 26h to gene...

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Abstract

The invention provides a preparation method of a Ni-Co-Mn ternary precursor. The preparation method comprises the steps of (1) preparing a mixed salt solution containing a nickel salt, a cobalt salt and a manganese salt according to a proportion that the mole ratio of nickel ions, cobalt ions and manganese ions is 1:1:1, adding an oxidizing agent into the mixed salt solution, and obtaining a mixed solution after uniform stirring, wherein the mass of the oxidizing agent accounts for 0.1-10% of the total mass of the nickel ions, the cobalt ions and the manganese ions in the mixed salt solution; (2) combining and adding the mixed solution, an alkali liquid and an ammonia solution into a reaction kettle, and performing reaction for 15-26 hours under 40-80 DEG C to generate paste containing the Ni-Co-Mn ternary precursor; and (3) allowing the paste containing the Ni-Co-Mn ternary precursor to overflow out of the reaction kettle after reaction finishes, and obtaining the Ni-Co-Mn ternary precursor after solid-liquid separation, washing and drying. The oxidizing agent is added into the mixed salt solution, so that a part of divalent manganese ions are oxidized to trivalent manganese ions, the formation of a crystal nucleus is facilitated, the primary crystal gain of a spherical precursor is refined, and the specific area of the precursor is expanded.

Description

technical field [0001] The invention relates to the technical field of battery material preparation, in particular to a nickel-cobalt-manganese ternary precursor and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy, long life, no memory effect and low pollution, and are widely used in mobile phones, computers, electric bicycles, electric vehicles, national defense and other fields. At present, the positive electrode materials used in lithium-ion batteries mainly include lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, and nickel-cobalt lithium manganese oxide. With the development of power batteries in electric vehicles, due to the low energy density of lithium iron phosphate and lithium manganese oxide, they cannot meet their requirements. Lithium nickel cobalt manganese oxide has the advantages of high specific capacity, good thermal stability and low price. It is the most potential ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/50H01M10/0525
CPCH01M4/364H01M4/50H01M4/52H01M10/0525Y02E60/10
Inventor 许开华张云河乐绪清王家良
Owner JINGMEN GEM NEW MATERIAL
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