Preparation method and application of ternary positive electrode material for battery

A composite positive electrode material and ternary battery technology, which is applied in the direction of battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve the problem of inability to ensure the uniform mixing of ternary materials and lithium iron phosphate, affecting the electrochemical performance and safety performance of batteries, etc. problems, to achieve the effect of good safety performance, short cycle time and excellent safety performance

Inactive Publication Date: 2017-07-28
SHENZHEN CENT POWER TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of a composite positive electrode material for a ternary battery, aiming at solving the problem that the existing preparation method of a composite positive electrode material for a ternary battery cannot ensure that the ternary material and lithium iron phosphate are evenly mixed, resulting in the occurrence of the two active substances separately. Agglomeration, a problem that affects the electrochemical performance and safety performance of batteries

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  • Preparation method and application of ternary positive electrode material for battery
  • Preparation method and application of ternary positive electrode material for battery
  • Preparation method and application of ternary positive electrode material for battery

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[0033] An embodiment of the present invention provides a method for preparing a composite positive electrode material for a ternary battery, comprising the following steps:

[0034] S01. Provide ternary materials and lithium iron phosphate;

[0035] S02. The ternary material and lithium iron phosphate are mixed to form a mixed material, and the mixed material is ball milled so that the particle size of the mixed material conforms to a normal distribution, and a composite positive electrode material for a ternary battery is obtained, wherein, The median diameter D50 of the ternary material is 8-10um, the median diameter D50 of the lithium iron phosphate is 1-2um, and the median diameter D50 of the mixed material is 9-13um.

[0036] Specifically, in the above step S01, the ternary material is a conventional ternary material in the field of ternary batteries. As a preferred embodiment, the ternary material is LiNi 1-x-y co x mn y o 2 , where 0

Embodiment 1

[0059] Will LiNi 0.5 co 0.2 mn 0.3 o 2 with LiFePO 4 Mix according to the mass ratio of 8:2, and ball mill until the particle size is normally distributed (D50=10.5um). The SEM image of the ternary battery composite positive electrode material after ball milling is as follows Figure 4 As shown, the particle size-cumulative particle percentage curve and the particle size distribution curve are as Figure 5 As shown, wherein, the particle size-cumulative particle percentage curve represents the weight percentage of particles less than or equal to a certain particle size in the total particles, and the particle size distribution curve represents the weight percentage of the particles with the corresponding particle size in the total particles . The above mixture is used as the positive electrode material, and the ternary soft pack battery PL556888 with an energy density of 181Wh / Kg is prepared according to the conventional soft pack lithium ion battery assembly process and ...

Embodiment 2

[0061] Will LiNi 0.5 co 0.2 mn 0.3 o 2 with LiFePO 4 Mix according to the mass ratio of 7:3, and ball mill until the particle size is normally distributed (D50=11.38um). Figure 6 As shown, wherein, the particle size-cumulative particle percentage curve represents the weight percentage of particles less than or equal to a certain particle size in the total particles, and the particle size distribution curve represents the weight percentage of the particles with the corresponding particle size in the total particles . The above mixture is used as the positive electrode material, and the ternary material soft-pack battery PL556888 with an energy density of 158Wh / kg is prepared according to the conventional soft-pack lithium-ion battery assembly process and chemical conversion process. The gram capacity of the positive electrode material is 143mAh / g, as shown in Figure 8 ;Cycle 200 times without attenuation, such as Figure 9 . Acupuncture and overcharge tests were carrie...

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Abstract

The invention provides a preparation method and application of a ternary positive electrode material for a battery, belonging to the field of ternary batteries. The preparation method comprises the following steps: providing a ternary material and lithium iron phosphate; and mixing the ternary material with lithium iron phosphate so as to form a mixed material and carrying out ball milling on the mixed material to allow the particle sizes of the mixed material to be in normal distribution so as to obtain the ternary positive electrode material for the battery, wherein the ternary material has a median diameter D50 of 8 to 10 [mu]m, the lithium iron phosphate has a median diameter D50 of 1 to 2 [mu]m, and the mixed material has a median diameter D50 of 9 to 13 [mu]m.

Description

technical field [0001] The invention belongs to the field of ternary batteries, and in particular relates to a preparation method and application of a composite positive electrode material of a ternary battery. Background technique [0002] With the depletion of non-renewable resources in the world, the energy crisis has emerged. At the same time, problems such as environmental pollution and ecological damage caused by the development and utilization of fossil energy have become increasingly prominent, and the above problems pose challenges to human survival and economic development. Therefore, it is particularly important to find alternative energy sources and develop efficient energy storage technologies. At present, on the one hand, energy conservation and emission reduction are achieved through the vigorous development of electric vehicles and hybrid electric vehicles; on the other hand, new renewable energy sources are actively developed, such as wind energy, solar ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/505H01M4/525H01M4/139H01M10/058H01M10/0525B02C17/10
CPCB02C17/10H01M4/139H01M4/362H01M4/505H01M4/525H01M4/5825H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 侯磊胡金丰张华农
Owner SHENZHEN CENT POWER TECH
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