Preparation method of ternary material with high cycle and stable structure

A ternary material and a stable structure technology, applied in structural parts, electrical components, electrochemical generators, etc., can solve the problems of capacity, cycle performance, and poor high-temperature storage performance, so as to reduce cation mixing, improve cycle performance, easy processing effect

Inactive Publication Date: 2018-01-19
GEM WUXI ENERGY MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a high-cycle and structurally stable ternary material preparation metho

Method used

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  • Preparation method of ternary material with high cycle and stable structure
  • Preparation method of ternary material with high cycle and stable structure
  • Preparation method of ternary material with high cycle and stable structure

Examples

Experimental program
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Example Embodiment

[0027] Such as figure 1 As shown, the method for preparing a ternary material with high cycle and stable structure provided by the present invention includes the following steps:

[0028] S1. Prepare precursors of nickel-cobalt-manganese ternary materials with different median diameters, and mix and ball-mill the precursors of each ternary nickel-cobalt-manganese ternary material with lithium source and doping compound, and then sinter and crush them. , Sieving, and finally get a variety of ternary materials with different median particle sizes;

[0029] S2, mixing the obtained ternary materials with different median particle diameters in proportion to obtain mixed ternary materials;

[0030] S3. The mixed ternary material is added to deionized water and stirred, then the lithium silicate aqueous solution is added dropwise and the stirring is continued. After the reaction is completed, the obtained slurry is filtered, evaporated, and dried, and finally sintered, crushed, and sieved ...

Example Embodiment

[0036] Example one:

[0037] Choose Ni with a median particle size of 15μm 0.5 Co 0.2 Mn 0.3 (OH) 2 , Press Li / Me = 1.03, weigh Ni 0.5 Co 0.2 Mn 0.3 (OH) 2 , Li 2 CO 3 And the doping compound, the doping amount of F element in the doping compound is 1500ppm, the doping amount of Si element is 1500ppm, and the doping amount of Co element is 12000ppm. They were ball-milled and mixed for 2 hours, then placed in a roasting furnace, roasted at 910°C for 10 hours in an air atmosphere, and the roasted product was crushed and sieved to obtain D 50 It is 14.0μm NCM523 ternary material.

[0038] Choose Ni with a median particle size of 6μm 0.5 Co 0.2 Mn 0.3 (OH) 2 , Press Li / Me = 1.03, weigh Ni 0.5 Co 0.2 Mn 0.3 (OH) 2 , Li 2 CO 3 And the doping compound, the doping amount of F element in the doping compound is 1500ppm; the doping amount of Si element is 1500ppm, and the doping amount of Co element is 12000ppm. They were ball-milled and mixed for 2 hours, and then calcined at 900°C for 10 h...

Example Embodiment

[0041] Embodiment two:

[0042] Choose Ni with a median particle size of 15μm 0.5 Co 0.2 Mn 0.3 (OH) 2 , According to Li / Me=1.03, weigh Ni 0.5 Co 0.2 Mn 0.3 O 2 , Li 2 CO 3 And doping compound, the doping amount of F element in the doping compound is 2000 ppm; the doping amount of Si element is 2000 ppm. They were ball-milled and mixed for 3 hours, then placed in a roasting furnace, and roasted in an air atmosphere at 930°C for 10 hours; the roasted product was crushed and sieved to obtain D 50 It is 14.0μm NCM523 ternary material.

[0043] Choose Ni with a median particle size of 6μm 0.5 Co 0.2 Mn 0.3 (OH) 2 , According to Li / Me=1.03, weigh Ni 0.5 Co 0.2 Mn 0.3 (OH) 2 , Li 2 CO 3 And the source compound of each doping element, wherein the doping amount of F element is 2000ppm; the doping amount of Si element is 2000ppm, and the doping amount of Co element is 12000ppm. They were ball-milled and mixed for 3 hours, then placed in a roasting furnace and roasted at 920°C for 10 hours ...

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Abstract

The invention is suitable for the field of positive electrode materials for lithium batteries and provides a preparation method of a ternary material with a high cycle and a stable structure. The method comprises the steps of mixing nickel-cobalt-manganese ternary material precursors with different particle sizes with a lithium source separately and doping an F salt, a Co salt and an oxide of Si to obtain ternary materials with different median particle sizes; mixing the ternary materials with different median particle sizes at a ratio; and coating the mixed material with lithium silicate to obtain the final nickel-cobalt-manganese ternary material with the high cycle and the stable structure. High material density and high capacity can be achieved by using the precursors with different particle sizes; the structure of the material is stabilized, the conductivity of the material is improved and the cycle performance of the material is improved by using the characteristic of reducing cation mixing through doping of different ions; a lithium silicate protection film can be finally formed on a surface layer of the material through coating the material with the lithium silicate; and the conductivity of the material is improved and the structure of the material is stabilized.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium batteries, and in particular relates to a preparation method of a ternary material with high cycle and stable structure. Background technique [0002] NCM nickel-cobalt-manganese ternary material has the advantages of large discharge capacity, good cycle performance, and low manufacturing cost. It is currently a widely used cathode material for lithium-ion batteries, especially in power batteries, and has a broad market and application prospects. [0003] In order to further meet the market's requirements for ternary materials, ternary materials are developing in the direction of high capacity, high cycle, high safety performance and stable structure. Studies have shown that the performance of NCM ternary materials will decay faster and faster as the number of cycles increases. In order to overcome this problem, the method of doping and covering ternary materials is widely u...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525
CPCY02E60/10
Inventor 徐世国李新章张明龙惠科石周晓燕
Owner GEM WUXI ENERGY MATERIAL CO LTD
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