Lithium manganese ferric phosphate-ternary material composite positive electrode material and preparation method therefor

A composite cathode material, lithium iron manganese phosphate technology, applied in electrical components, battery electrodes, structural parts, etc., can solve the problems of component segregation, reduced energy density of mixed electrodes, and difficulty in uniform distribution of particles, preventing deterioration and improving stability. Sexuality and Circulation, Effects of Reducing Contact

Active Publication Date: 2018-01-05
中科致良新能源材料(浙江)有限公司
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  • Description
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Problems solved by technology

However, in this patent, lithium iron phosphate manganese phosphate and ternary materials are simply physically mixed during homogenization, and lithium iron phosphate is only in point contact with the surface of some ternary material particles, so the improvement effect is limited; Delamination will occur during the electrode distribution process, resulting in segregation of the two components
In addition, ternary materials generally have larger particles, with a particle size D50 of about 10 microns, while lithium manganese phosphate particles are generally smaller, with a particle size D50 of about 1-2 microns. Through traditional mixing, coating, and drying methods, due to Both particles are difficult to distribute evenly, and it is difficult to obtain high compaction density
[0005] Chinese patents CN103682318A and CN104201366A use the high safety performance of ternary materials to compound lithium iron phosphate

Method used

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  • Lithium manganese ferric phosphate-ternary material composite positive electrode material and preparation method therefor
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  • Lithium manganese ferric phosphate-ternary material composite positive electrode material and preparation method therefor

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preparation example Construction

[0048] The present invention also discloses a preparation method of lithium manganese iron phosphate-ternary material composite positive electrode material, comprising the following steps:

[0049] S1, mix lithium manganese iron phosphate material with ternary material in a certain proportion, the quality of lithium manganese iron phosphate material is M1, the quality of ternary material is M2, M1:M2 is between 1:99 and 4:6, and ferromanganese phosphate The sum of the mass of lithium and the mass of the ternary material is the mass of the active material of the lithium battery, which is Ma=M1+M2; preferably, M1:M2 is between 5:95 and 15:85;

[0050] S2, adding a certain mass ratio of binder and conductive agent, wherein the quality of the solid binder is M3; the quality of the conductive agent is M4, wherein: M3: Ma is between 0:100 and 5:100, M4: Ma between 0:100 and 5:100;

[0051] S3, using a mechanical fusion machine to perform high-speed mechanical fusion to obtain lithi...

Embodiment 1

[0058] Lithium manganese iron phosphate particles and ternary material NCM523 are mixed according to the mass ratio of 1:9 and then mechanically fused and coated:

[0059] 1. Use a mechanical fusion machine with a cabin volume of 0.3 liters, and load 180 grams of ternary material NCM523 and 20 grams of lithium manganese iron phosphate material;

[0060] 2. The product was obtained after the equipment was operated at a speed of 4600 rpm for 4 minutes, which was named product 1;

[0061] 3. The electron microscope photo of product 1 is shown in the attachment figure 1 - attached image 3 ;

[0062] 4. Product 1 was measured with a laser particle size analyzer, using water as the medium, and the refractive index of the ternary material and product 1 were both set to 2.6. The results are described in Table 1. The particle size distribution of the ternary material is shown in the appendix Figure 5 , the particle size distribution of product 1 is shown in the attached Figure 6...

Embodiment 2

[0068] The lithium manganese iron phosphate particles and the ternary material NCM523 are mixed according to the mass ratio of 3:7 and then mechanically fused and coated:

[0069] 1. Use a mechanical fusion machine with a cabin volume of 0.3 liters, and load 140 grams of ternary material NCM523 and 60 grams of lithium manganese iron phosphate material;

[0070] 2. The product was obtained after the equipment was operated at a speed of 4600 rpm for 4 minutes, which was named product 2;

[0071] 3. The electron microscope photo of product 2 is shown in Figure 1-Figure 3 ;

[0072]4. Product 2 is measured with a laser particle size analyzer, using water as the medium, and setting the refractive index of the ternary material and product 2 to 2.6. The results are described in Table 1. The particle size distribution diagram of the ternary material is shown in Figure 5 , the particle size distribution of product 2 is shown in Figure 7 ;

[0073] 5. The charge and discharge cur...

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Abstract

The invention discloses a lithium manganese ferric phosphate-ternary material composite positive electrode material and a preparation method therefor. Lithium manganese ferric phosphate nanoparticlesare fixed on the surfaces of the ternary material granules through a mechanical fusion method to form a tight porous coating layer; therefore, the problem of easy segregation caused by different densities of the ternary material and the lithium manganese ferric phosphate positive electrode material when the mixed paste of the ternary material and the lithium manganese ferric phosphate positive electrode material is needed in the paste mixing stage in the use process of the ternary material and the lithium manganese phosphate positive electrode material can be solved; and by virtue of tight coating of the lithium manganese ferric phosphate on the surface of the ternary material, a stable core-shell structure can be obtained, so that the surface of the ternary material (particularly a high-nickel ternary material) can be protected by the lithium manganese ferric phosphate material, degradation of the ternary material caused by absorption of water contents in the environments can be prevented, direct contact between the ternary material and an electrolyte in the battery can be lowered, and the stability and cyclicity of the ternary material are improved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a positive electrode material composed of lithium manganese iron phosphate-ternary materials and a preparation method thereof. Background technique [0002] Ternary materials are widely used in positive electrode materials of electric vehicle batteries due to their high energy density. 1 / 3 co 1 / 3 mn 1 / 3 o 2 to LiNi 0.5 co 0.2 mn 0.3 o 2 Transformation, and even many ternary material companies have begun to develop LiNi 0.6 co 0.2 mn 0.2 o 2 、LiNi 0.8 co 0.1 mn 0.1 o 2 , LiNiO 2 , NCA and other high nickel materials. [0003] With the continuous increase of nickel content in ternary materials, the specific capacity of ternary materials has also increased significantly, but it also caused two direct effects: 1) The thermal stability temperature of ternary materials after the content of nickel is increased Constantly de...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525Y02E60/10
Inventor 卢威高珊陈朝阳李伟红
Owner 中科致良新能源材料(浙江)有限公司
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