Preparation method of ternary precursor, ternary precursor, positive electrode material and lithium ion battery

A precursor, nickel ion technology, applied in the metallurgical field, can solve problems such as rate, cycle performance decline, active component reduction, battery impedance increase, etc., to promote lithium ion transmission, increase cycle life, and avoid overcharge and overdischarge. Effect

Active Publication Date: 2021-04-09
GUANGDONG JIANA ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prepared lithium-ion battery will increase with the increase in the number of lithium battery cycles. The primary particles in the secondary ball have different crystal plane orientations and slip planes, and the anisotropy of lattice expansion and contraction between crystal grains leads to the increase in the cycle tim

Method used

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  • Preparation method of ternary precursor, ternary precursor, positive electrode material and lithium ion battery
  • Preparation method of ternary precursor, ternary precursor, positive electrode material and lithium ion battery
  • Preparation method of ternary precursor, ternary precursor, positive electrode material and lithium ion battery

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preparation example Construction

[0056] According to a first aspect of the present invention, a method for preparing a ternary precursor comprises the following steps:

[0057] (a) Preparation of ternary precursor crystal seed: the soluble inorganic salt mixed solution of nickel ion, cobalt ion and manganese ion, precipitant, complexing agent and organic solvent are added in the first reactor, mixed reaction, when the first Stop feeding when the material in the reactor reaches full capacity, and obtain ternary precursor crystal seeds;

[0058] Wherein, the bottom liquid is contained in the first reactor; the bottom liquid includes a salting-out agent and a complexing agent;

[0059] The first reaction kettle is provided with a guide tube without a baffle, the purpose of which is to realize the uniform feeding of five raw materials including nickel, cobalt and manganese three-element mixed inorganic salt solution, liquid caustic soda, ammonia water, salting-out agent and organic solvent. , and will not distur...

Embodiment 1

[0145] The invention provides a process for a precursor of a high-magnification ternary cathode material, comprising the following steps:

[0146] (1) The total molar weight of nickel, cobalt and manganese is 1.2mol / L, the molar ratio of nickel, cobalt and manganese is 6:2:2, mixed solution of sulfate, 25wt% NaOH solution, 12wt% ammonia solution , ethanol and other materials are fed at a constant speed by a metering pump to the reactor A containing the bottom liquid, and the temperature of the reaction system is controlled at 50 ° C, protected by a nitrogen atmosphere, and the nitrogen flow rate is 1.0m 3 / h, the pH is 10.90-11.50, the free ammonia concentration in the solution is 4.0-8.0g / L, the stirring speed is 260rpm, the flow rate of the ternary liquid is controlled at 300L / h, and the material in the reactor A reaches full and stops feeding. Among them, the concentration of ammonium root in the bottom liquid is 4.0-6.0g / L, the pH is 10.90-11.50, the concentration of sodiu...

Embodiment 2

[0155] The invention provides a process for a precursor of a high-magnification ternary cathode material, comprising the following steps:

[0156] (1) The total molar weight of nickel, cobalt and manganese is 1.5mol / L, the molar ratio of nickel, cobalt and manganese is 6:2:2, a sulfate mixed solution, 32wt% NaOH solution, and 15wt% ammonia solution , Methanol and other four materials are fed at a uniform speed by a metering pump to the reaction kettle A containing the bottom liquid at the same time, and the temperature of the reaction system is controlled at 50°C, protected by a nitrogen atmosphere, and the nitrogen flow rate is 1.0m 3 / h, the pH is 10.90-11.50, the free ammonia concentration in the solution is 4.0-8.0g / L, the stirring speed is 260rpm, the flow rate of the ternary liquid is controlled at 300L / h, and the material in the reactor A reaches full and stops feeding. Among them, the bottom liquid has an ammonium root concentration of 4.0-6.0 g / L, a pH of 10.90-11.50,...

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Abstract

The invention provides a preparation method of a ternary precursor, the ternary precursor, a positive electrode material and a lithium ion battery, and relates to the technical field of metallurgy, and the preparation method comprises the following steps: (a) preparing a ternary precursor seed crystal in a first reaction kettle; (b) preparing ternary precursor slurry by utilizing the ternary precursor seed crystal; and (c) obtaining the ternary precursor. The method is low in requirement for production equipment, capable of achieving large-scale production, high in efficiency and stable in product quality. Primary particles on the surfaces of secondary spherical particles of the ternary precursor provided by the invention are regularly arranged and are loose and porous, and particularly gaps can be generated between primary particles. The ternary precursor can be used for preparing a positive electrode material. The positive electrode material can be used for preparing a lithium ion battery, a lithium ion diffusion channel can be increased, and the first charge-discharge performance, cycle performance and rate capability of the battery can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a preparation method of a ternary precursor, a ternary precursor, a positive electrode material, and a lithium ion battery. Background technique [0002] The ternary precursor is a highly customized standard product of the ternary cathode material, and is a key material for the production of the ternary cathode. The performance of the ternary precursor directly determines the main physical and chemical properties of the ternary cathode material, such as particle size, element ratio, and impurity content, thereby affecting the core electrochemical properties of the lithium battery such as consistency, rate performance, energy density, and cycle life. The most common synthesis method of the ternary precursor is the co-precipitation method, which is formed from a mixed solution of nickel, cobalt, and manganese salts, under the protection of ammonia water as a complexing agent, so...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/03C01P2004/32C01P2004/61H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 黄亚祥郑江峰张晨
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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