Surface modification method of high-nickel positive electrode material and modified high-nickel positive electrode material

A technology of surface modification and positive electrode materials, applied in chemical instruments and methods, nickel compounds, battery electrodes, etc., can solve the problems of increased specific surface area, blockage of lithium ion transmission path, high residual alkali of ternary materials, etc., to achieve stable growth performance, capacity enhancement and cycle stability, and capacity and cycle stability performance reduction effects

Active Publication Date: 2022-03-25
宜宾锂宝新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] High nickel (Ni>90) ternary materials have high residual alkali, which will lead to blockage of lithium ion transmission path, low capacity, and affect the subsequent battery pulping process
At this stage, water washing is usually used to reduce residual alkali, but the removal effect of residual alkali is poor during water washing
If the method of pickling is used to reduce the residual alkali, it will easily lead to an increase in the specific surface area, which will affect the capacity and cycle performance of the ternary cathode material

Method used

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  • Surface modification method of high-nickel positive electrode material and modified high-nickel positive electrode material
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  • Surface modification method of high-nickel positive electrode material and modified high-nickel positive electrode material

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preparation example Construction

[0037] It should be added that the preparation method of the nickel-cobalt-manganese ternary positive electrode material can refer to the prior art, which is not limited here. In some embodiments, the preparation process of the nickel-cobalt-manganese ternary positive electrode material includes: uniformly mixing the precursor, the lithium source and the dopant for sintering, and the dopant is selected from Zr, Sr, Y, Mo and Mg At least one; the precursor can be Ni 0.92 co 0.04 mn 0.04 (OH) 2 , The sintering temperature is 700-750°C, and the holding time is 10-15h.

[0038] S2, coating

[0039] The material after pickling is mixed and sintered with a covering agent; wherein, the covering agent contains elements W, Al and B. During the sintering process, W and B enter the grain boundary to fill the grain boundary to reduce the specific surface area of ​​the material, and Al is used to increase the stability of the material interface. After sintering, the capacity and cycle...

Embodiment 1

[0049] This embodiment provides a method for surface modification of a high-nickel positive electrode material, including:

[0050] will Ni 0.92 co 0.04 mn 0.04 (OH) 2 Precursor 500g and monohydrate lithium hydroxide 239.3g, and dopant SrCO 3 2.11g, Y 2 o 3 0.64g, MgO 0.37g, MoO 3 0.90g, after mixing evenly, raise the temperature to 730°C at a heating rate of 3°C / min and keep it for 12h. After one firing, the high-nickel material LiNi is obtained 0.92 co 0.04 mn 0.04 o 2 , cross a 400-mesh sieve for subsequent use.

[0051] Take 500g of one-fired high-nickel material LiNi 0.92 co 0.04 mn 0.04 o 2 , the material is immersed in an oxalic acid solution with a mass fraction of 2% and a volume of 500ml. The immersion time is 3 minutes. After suction filtration, it is dried until the material moisture is less than 0.1%. At this time, the specific surface area of ​​the material is detected (specific surface area 1.12m 2 / g).

[0052] Weigh the washed material 300g, ...

Embodiment 2

[0058] This embodiment provides a method for surface modification of a high-nickel positive electrode material, including:

[0059] will Ni 0.92 co 0.04 mn 0.04 (OH) 2 Precursor 500g and lithium hydroxide monohydrate 239.3g, and dopant ZrO 2 2.03g, Y 2 o 3 0.64g, MgO 0.37g, after mixing evenly, raise the temperature to 730°C at a heating rate of 3°C / min and keep it for 12h. After one firing, the high-nickel material LiNi is obtained. 0.92 co 0.04 mn 0.04 o 2 , cross a 400-mesh sieve for subsequent use.

[0060] Take 500g of one-fired high-nickel material LiNi 0.92 co 0.04 mn 0.04 o 2 , the material is immersed in an oxalic acid solution with a mass fraction of 2% and a volume of 500ml. The immersion time is 3 minutes. After suction filtration, it is dried until the material moisture is less than 0.1%. At this time, the specific surface area of ​​the material is detected (specific surface area 1.08m 2 / g).

[0061] Weigh the washed material 300g, and coating age...

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Abstract

The invention discloses a surface modification method of a high-nickel positive electrode material and a modified high-nickel positive electrode material, and relates to the technical field of lithium ion batteries. The surface modification method of the high-nickel positive electrode material comprises the following steps: carrying out acid pickling on the high-nickel positive electrode material, and then mixing and sintering with a coating agent, wherein the coating agent contains elements W, Al and B. The high-nickel positive electrode material is firstly subjected to acid pickling to effectively remove residual alkali, then specific coating elements are used for sintering, W and B enter a grain boundary and are used for filling the grain boundary so as to reduce the specific surface area of the material, Al is used for improving the stability of a material interface, and the capacity and cycling stability of the material can be remarkably improved after sintering. Therefore, the purpose of remarkably reducing the residual alkali of the material on the premise of ensuring the capacity and the cycling stability of the material is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for surface modification of a high-nickel positive electrode material and a modified high-nickel positive electrode material. Background technique [0002] The main constituent materials of lithium-ion batteries include electrolyte, separator, positive electrode materials and negative electrode materials. Among them, positive electrode materials account for a large proportion and are the key materials to promote the performance of lithium-ion batteries. Therefore, it is particularly important to prepare lithium-ion battery positive electrode materials with good physical and chemical properties. . [0003] A few years ago, it was required that the specific energy of the power battery unit reach 300Wh / kg, and the specific energy of the system reach 260Wh / kg. It has become an industry consensus to increase the energy density of the battery. By increasing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B35/10C01F7/02C01F7/021C01G41/02H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/50C01G41/02C01F7/021C01F7/02C01B35/1045H01M4/62H01M4/505H01M4/525H01M10/0525C01P2006/12C01P2006/40C01P2002/72C01P2004/03Y02E60/10
Inventor 程正张彬朱淇才范未峰王政强
Owner 宜宾锂宝新材料有限公司
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