Modified high-nickel ternary positive electrode material and preparation method thereof

A cathode material, high nickel technology

Pending Publication Date: 2022-08-02
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These residual lithium compounds will have a negative impact on the lithium-ion battery, which will cause the lithium-ion battery to generate gas during the cycle, and will also cause the slurry of the high-nickel ternary cathode material to gel during the manufacturing process of the lithium-ion battery. change

Method used

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  • Modified high-nickel ternary positive electrode material and preparation method thereof
  • Modified high-nickel ternary positive electrode material and preparation method thereof
  • Modified high-nickel ternary positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1 Preparation of a modified high nickel ternary positive electrode material

[0055] (1) Preparation of nickel-cobalt-manganese hydroxide precursor coated with cobalt element on the surface:

[0056] Dissolve 45.82 g of cobalt chloride hexahydrate in 120 mL of deionized water to prepare a cobalt chloride aqueous solution, and place the cobalt chloride aqueous solution in a spray device. Take 1111.7g nickel cobalt manganese hydroxide precursor Ni 0.95 Co 0.03 Mn 0.02 (OH) 2 It is placed in a high-efficiency mixer with heating function for stirring, the heating temperature is 150 °C, and the stirring speed is 600 rpm. In the process of high-speed stirring of the precursor, use the spray equipment equipped with cobalt chloride aqueous solution for spraying, control the spray time to 30min, the spray flow rate to 4mL / min, the solution is completely sprayed, and the high-efficiency mixer with heating function after spraying Continue stirring for 120 min until Ni...

Embodiment 2

[0061] Example 2 Preparation of a modified high nickel ternary positive electrode material

[0062] (1) Preparation of nickel-cobalt-manganese hydroxide precursor coated with cobalt element on the surface:

[0063] Dissolve 34.92 g of cobalt nitrate in 120 mL of deionized water to prepare an aqueous cobalt nitrate solution, and place the aqueous cobalt nitrate solution in a spray device. Take 1111.7g nickel cobalt manganese hydroxide precursor Ni 0.95 Co 0.03 Mn 0.02 (OH) 2 It is placed in a high-efficiency mixer with heating function for stirring, the heating temperature is 150 °C, and the stirring speed is 600 rpm. In the process of high-speed stirring of the precursor, use a spray device equipped with a cobalt nitrate aqueous solution for spraying, control the spray time to 30min, the spray flow rate to 4mL / min, the solution is completely sprayed, and the high-efficiency mixer with heating function continues after spraying. Stir for 120 min until the precursor is fully...

Embodiment 3

[0068] Example 3 Preparation of a modified high nickel ternary positive electrode material

[0069] (1) Preparation of nickel-cobalt-manganese hydroxide precursor coated with cobalt element on the surface:

[0070] Dissolve 84.65 g of cobalt acetate tetrahydrate in 120 mL of deionized water to prepare a cobalt acetate aqueous solution, and place the cobalt acetate aqueous solution in a spray device. Take 1kg nickel cobalt manganese hydroxide precursor Ni 0.95 Co 0.03 Mn 0.02 (OH) 2 It is placed in a high-efficiency mixer with heating function for stirring, the heating temperature is 150 °C, and the stirring speed is 600 rpm. In the process of high-speed stirring of the precursor, use a spray device equipped with a cobalt acetate aqueous solution for spraying, control the spray time to 30min, the spray flow rate to 4mL / min, the solution is completely sprayed, and the high-efficiency mixer with heating function continues after spraying. Stir for 120 min until the precursor ...

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Abstract

The invention discloses a modified high-nickel ternary positive electrode material and a preparation method thereof. The modified high-nickel ternary positive electrode material is a cobalt element doped and cobalt element coated high-nickel ternary positive electrode material. Wherein the mass fraction of the doped cobalt element is 0.2-2%, and the thickness of the cobalt element coating layer is 20-200 nm. The cobalt element doped on the surface of the high-nickel ternary positive electrode material can improve the cycle performance of the high-nickel ternary positive electrode material, and cobalt hydroxide reacts with residual lithium on the surface of the material during microwave treatment of the coated cobalt element, so that the content of the residual lithium on the surface of the material can be reduced. Under the combined action of doping and coating, the performance of the high-nickel ternary positive electrode material is obviously improved. The preparation method disclosed by the invention is simple, low in cost, environment-friendly and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and particularly relates to a modified high-nickel ternary positive electrode material and a preparation method thereof. Background technique [0002] The requirement of high energy density in power batteries has promoted the development of high-nickel cathode materials, lithium-rich manganese-based cathode materials, and lithium-sulfur batteries. The high-nickel ternary cathode material LiNi x Co y Mn 1-x-y O 2 (NCM) has the advantages of high specific capacity, good rate performance and relatively low cost. [0003] However, high-nickel ternary cathode materials have disadvantages such as poor cyclability, thermal stability, and safety. The high-nickel ternary cathode material will cause its layered structure to change to a rock-salt structure during high-temperature synthesis, storage in air, and repeated charge-discharge processes, which inhibits the transport of lithium ions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCH01M4/505H01M4/525H01M4/131H01M4/1391H01M10/0525Y02E60/10
Inventor 罗翠苹李长东刘伟健陈希文阮丁山蔡勇
Owner GUANGDONG BRUNP RECYCLING TECH
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