A kind of carbon-coated ternary positive electrode material and preparation method thereof

A positive electrode material, carbon coating technology, applied in the field of carbon coated ternary positive electrode materials and its preparation, can solve the problems of reducing polarization, increasing conductivity, carbon-carbon network defects, etc., to improve electrode conductivity, structure Stable and good covering effect

Active Publication Date: 2019-01-15
湖南裕能新能源电池材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Doping mainly improves the structure of the material from the inside, while coating is to modify the surface of the material, by increasing the conductivity of the material, reducing the polarization, or forming a protective layer, so that the positive electrode material and The electrolyte is isolated to avoid the corrosion of the electrolyte in order to protect the material and improve the electrochemical performance. However, the carbon-coated carbon coating currently produced has carbon-oxygen and carbon-carbon network defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A carbon-coated ternary cathode material, the chemical formula of which is LiNi x co y mn z o 2 , wherein x=0.7, y=0.1, z=0.2, the outer surface of the ternary cathode material is covered with a carbon-carbon network.

[0035] The preparation method of the carbon-coated ternary positive electrode material, its steps are as follows:

[0036] Step 1, adding nickel chloride, cobalt chloride and manganese chloride into distilled water, stirring evenly until dissolved to form a solution;

[0037] Step 2, add ammonia water to the solution and stir evenly until no precipitation occurs;

[0038] Step 3, filtering the precipitation solution in step 2 to obtain a ternary precipitation, washing and drying;

[0039] Step 4, putting the washed precipitate into ammonium oxalate, and co-cooking at a constant temperature to obtain a co-cooking liquid;

[0040] Step 5, adding lithium oxalate to the co-cooking liquid, stirring evenly until completely dissolved;

[0041] Step 6, he...

Embodiment 2

[0059] A carbon-coated ternary cathode material, the chemical formula of which is LiNi x co y mn z o 2 , wherein 0.2=x, y=0.5, z=0.3, the outer surface of the ternary cathode material is covered with a carbon-carbon network.

[0060] The preparation method of the carbon-coated ternary positive electrode material, its steps are as follows:

[0061] Step 1, adding nickel chloride, cobalt chloride and manganese chloride into distilled water, stirring evenly until dissolved to form a solution;

[0062] Step 2, add ammonia water to the solution and stir evenly until no precipitation occurs;

[0063] Step 3, filtering the precipitation solution in step 2 to obtain a ternary precipitation, washing and drying;

[0064] Step 4, putting the washed precipitate into ammonium oxalate, and co-cooking at a constant temperature to obtain a co-cooking liquid;

[0065] Step 5, adding lithium oxalate to the co-cooking liquid, stirring evenly until completely dissolved;

[0066] Step 6, he...

Embodiment 3

[0084] A carbon-coated ternary cathode material, the chemical formula of which is LiNi x co y mn z o 2 , wherein x=0.4, y=0.4, z=0.2, the outer surface of the ternary cathode material is covered with a carbon-carbon network.

[0085] The preparation method of the carbon-coated ternary positive electrode material, its steps are as follows:

[0086] Step 1, adding nickel chloride, cobalt chloride and manganese chloride into distilled water, stirring evenly until dissolved to form a solution;

[0087] Step 2, add ammonia water to the solution and stir evenly until no precipitation occurs;

[0088] Step 3, filtering the precipitation solution in step 2 to obtain a ternary precipitation, washing and drying;

[0089] Step 4, putting the washed precipitate into ammonium oxalate, and co-cooking at a constant temperature to obtain a co-cooking liquid;

[0090] Step 5, adding lithium oxalate to the co-cooking liquid, stirring evenly until completely dissolved;

[0091] Step 6, he...

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Abstract

The invention discloses a carbon-coated ternary cathode material. The chemical formula of the carbon-coated ternary cathode material is LiNi<x>Co<y>Mn<z>O<2>, wherein 0.2<=x<=0.7, 0.1<=y<=0.5, 0.2<=z<=0.3, and x+y+z=1. The outer surface of the carbon-coated ternary cathode material is coated with a carbon carbon network. The invention also provides a preparation method. The carbon-coated ternary cathode material is capable of improving electrode electrical conductivity effectively, improving surface chemical properties of active materials, protecting electrodes from direct contact with electrolyte, and prolonging cycle life.

Description

technical field [0001] The invention belongs to the technical field of cathode materials, and in particular relates to a carbon-coated ternary cathode material and a preparation method thereof. Background technique [0002] Nickel cobalt lithium manganese oxide ternary cathode material has been widely studied since it was first reported in 1999. The ternary cathode material combines lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide through the synergistic effect of Ni-Co-Mn. The advantages of the three materials: high capacity characteristics of lithium nickel oxide, high safety performance and low cost of lithium manganese oxide, good cycle performance of lithium cobalt oxide, has become one of the most promising cathode materials for lithium ion batteries in recent years . At present, the country is vigorously developing new energy vehicles. As a high-capacity, high-energy-density lithium-ion battery cathode material, ternary materials have great adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/505H01M4/525H01M4/625H01M4/628Y02E60/10
Inventor 黄俊杰
Owner 湖南裕能新能源电池材料股份有限公司
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