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Surface-coated ternary positive electrode material, preparation method and application thereof

A positive electrode material and surface coating technology, which is applied in the field of surface coated ternary positive electrode materials, can solve the problems of increasing costs in an inert atmosphere, and achieve the effects of reducing the possibility of redox reactions, improving electrochemical performance, and saving production costs

Inactive Publication Date: 2021-04-20
大连融科储能集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, conductive carbon black will more or less react with the positive electrode material under high temperature conditions; on the other hand, the introduction of inert atmosphere will increase the cost

Method used

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  • Surface-coated ternary positive electrode material, preparation method and application thereof
  • Surface-coated ternary positive electrode material, preparation method and application thereof

Examples

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Embodiment 1

[0026] This embodiment discloses a preparation method and application of a surface-coated ternary positive electrode material. The specific implementation steps are as follows:

[0027] Step 1: Weigh the No. S01 ternary precursor and lithium hydroxide monohydrate according to the material ratio of 1:1.03, and then mix them uniformly in a ball mill under the conditions of r=120rpm and t=288min.

[0028] Step 2: Put the above-mentioned ball mill in a muffle furnace in an air atmosphere, and perform calcination according to a temperature gradient of 500°C (5h) / 720°C (12h).

[0029] Step 3: Combine the obtained ternary cathode material with Mg(NO 3 ) 2 ·H 2 O was weighed according to the mass ratio of 30:1 and mixed uniformly in the ball mill under the conditions of r=120rpm and t=60min.

[0030] Step 4: The above-mentioned ball mill is placed in a muffle furnace in an air atmosphere, and calcined according to a temperature gradient of 120°C (2h) / 500°C (2h).

[0031] Step 5: ...

Embodiment 2

[0037] This embodiment discloses a preparation method and application of a surface-coated ternary positive electrode material. The specific implementation steps are as follows:

[0038] Step 1: Weigh the No. S02 ternary precursor and lithium hydroxide monohydrate according to the material ratio of 1:1.03, and then mix them uniformly in a ball mill under the conditions of r=160rpm and t=288min.

[0039] Step 2: Put the above-mentioned ball grinding material in a muffle furnace in an air atmosphere, and perform calcination according to a temperature gradient of 500°C (5h) / 760°C (12h).

[0040] Step 3: Combine the obtained ternary cathode material with Mg(CH 3 COO) 2 4H 2 O was weighed according to the mass ratio of 30:1 and mixed uniformly in the ball mill under the conditions of r=120rpm and t=60min.

[0041] Step 4: The above-mentioned ball mill is placed in a muffle furnace in an air atmosphere, and calcined according to a temperature gradient of 120°C (2h) / 500°C (2h).

[...

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Abstract

The invention provides a surface-coated ternary positive electrode material, and a preparation method and an application thereof. The preparation method of the surface-coated ternary positive electrode material comprises the following steps: mixing the ternary positive electrode material with magnesium salt; roasting a mixture for 1-4h at the temperature of 100-150 DEG C; then roasting for 1-3h at the temperature of 500-720 DEG C to prepare a roasted material; adding the roasted material and conductive carbon black into deionized water, and preparing a turbid liquid under an ultrasonic condition; and putting the turbid liquid into a spray dryer, enabling an inlet temperature to be 150-200 DEG C and the outlet temperature to be 100-120 DEG C, and spraying under a low-temperature condition to prepare the surface-coated ternary positive electrode material. According to the method disclosed by the invention, the surface of the ternary positive electrode material can be coated with the carbon layer under the condition of a low temperature and the condition of having no protective atmosphere; and compared with the ternary positive electrode material which is not coated with the carbon layer, the ternary positive electrode material coated with the carbon layer has the advantages that the electron transfer rate is increased, and the electrochemical performance of the material is improved.

Description

technical field [0001] The invention relates to positive electrode material technology, in particular to a surface-coated ternary positive electrode material, a preparation method and application thereof. Background technique [0002] In recent years, due to the frequent use of traditional fossil fuels, the problem of global environmental pollution has become more and more serious. At the same time, air pollution has made human beings punished by nature. It is imminent to develop clean, efficient and recyclable new energy sources. Among many new energy sources, lithium-ion batteries have become a research hotspot for chemical researchers around the world due to their outstanding advantages such as environmental friendliness, high energy density, high power density, and long cycle life. The key to lithium-ion batteries lies in the selection and optimization of positive and negative electrode materials. Among many positive electrode materials, nickel-cobalt-manganese ternar...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 魏晶孟昭扬李宗麟曹永强刘阳全成龙
Owner 大连融科储能集团股份有限公司