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Hafnium diboride-coated ternary positive electrode material, preparation method thereof and lithium ion battery

A technology of hafnium diboride and positive electrode material, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems affecting applications, and achieve the effects of improving electrical conductivity, reducing side reactions, and improving rate performance

Pending Publication Date: 2021-10-19
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still some shortcomings in the cycle performance, high temperature performance and rate performance of the ternary battery, which affects its practical application.

Method used

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  • Hafnium diboride-coated ternary positive electrode material, preparation method thereof and lithium ion battery
  • Hafnium diboride-coated ternary positive electrode material, preparation method thereof and lithium ion battery
  • Hafnium diboride-coated ternary positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0028] The embodiment of the present application provides a preparation method of a hafnium diboride-coated ternary positive electrode material, such as figure 1 As shown, the method includes the following steps:

[0029] Step 101, using a mixed solution of nickel salt, cobalt salt and manganese salt as a raw material to prepare a precursor slurry.

[0030] Adding nickel salt, cobalt salt, and manganese salt into deionized water to prepare a mixed solution, adding a complexing agent and a strong alkali solution to the mixed solution under nitrogen protection, and performing a mixing reaction to obtain a precursor slurry.

[0031] In the application, nickel salt, cobalt salt, and manganese salt are added to deionized water according to a preset ratio for mixing and dissolving to obtain a mixed solution, and the mixed solution is transferred to a reaction kettle, and under the protection of nitrogen, a complexing agent is added for mixing. A strong alkali solution is then added...

Embodiment 1

[0054] S1. Add nickel salt, cobalt salt, and manganese salt into deionized water according to the molar ratio of 83:6:6 for mixing and dissolving to obtain a mixed solution with a molar concentration of 2mol / L. Add 1mol / L ammonia water and mix, then add 4mol / L strong alkali solution to carry out mixed reaction, the temperature of the mixed reaction is 55°C, the mixing speed is 450rpm, the pH value of the mixed solution is controlled to 11.5, and after the mixed reaction, Precursor slurry;

[0055] S2. After filtering the precursor slurry obtained in S1, washing with deionized water and drying (the drying temperature is 85° C.), the precursor crystal is obtained, and the D50 is 12.0 μm;

[0056] S3. Mix and grind the precursor crystal obtained in S2 with hafnium diboride and lithium carbonate at a molar ratio of 2:0.2:1, transfer to a roller kiln and calcinate at 600°C for 18 hours (heating rate is 5°C / min) , sieved and demagnetized after cooling to obtain a hafnium diboride-c...

Embodiment 2

[0062] S1. Add nickel salt, cobalt salt, and manganese salt into deionized water according to the molar ratio of 83:6:6 for mixing and dissolving to obtain a mixed solution with a molar concentration of 2mol / L. Add 1mol / L ammonia water and mix, then add 4mol / L strong alkali solution to carry out mixed reaction, the temperature of the mixed reaction is 55°C, the mixing speed is 450rpm, the pH value of the mixed solution is controlled to 11.5, and after the mixed reaction, Precursor slurry;

[0063] S2. After filtering the precursor slurry obtained in S1, washing with deionized water and drying (the drying temperature is 85° C.), the precursor crystal is obtained, and the D50 is 12.0 μm;

[0064] S3. Mix and grind the precursor crystal obtained in S2 with hafnium diboride and lithium carbonate at a molar ratio of 2:0.5:1, transfer to a roller kiln and calcinate at 600°C for 22 hours (heating rate is 5°C / min) , sieved and demagnetized after cooling to obtain a ternary cathode ma...

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Abstract

The invention relates to a hafnium diboride-coated ternary positive electrode material, a preparation method thereof and a lithium ion battery. The method comprises the following steps of: prepare precursor slurry from a mixed solution of nickel salt, cobalt salt and manganese salt as a raw material; performing solid-liquid separation, washing and drying on the precursor slurry to obtain a precursor crystal; and mixing the precursor crystal with hafnium diboride and a lithium salt, and sequentially grinding, calcining at high temperature, cooling and demagnetizing to obtain the hafnium diboride-coated ternary positive electrode material. The ternary positive electrode material is coated with hafnium diboride, so that the conductivity of the ternary positive electrode material is effectively improved, the direct contact between the ternary positive electrode material and an electrolyte is reduced, the side reaction is reduced, and the rate capability, the cycle performance and the high-temperature storage performance of the battery are improved.

Description

technical field [0001] The present application relates to the technical field of lithium-ion battery materials, in particular to a hafnium diboride-coated ternary positive electrode material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Due to its high energy density, wide operating voltage range, and long cycle life, lithium-ion batteries are used in many fields of life, such as consumer electronics, pure electric vehicles or hybrid vehicles, energy storage, power tools products etc. With the vigorous development of the new energy industry, the number of new energy vehicles is increasing, and the shipment of power batteries is also increasing. Among them, ternary batteries, as a representative of high energy density power batteries, are used in pure electric passenger vehicles. In the car, it has a high cruising range. [0003] However, there are still some shortcomings in the cycle performance, high temperature performance and ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M4/62H01M4/624H01M4/628H01M4/131H01M10/0525Y02E60/10
Inventor 何海平詹世英李海军
Owner YINLONG ENERGY CO LTD