Coating method of high-nickel ternary material

A high-nickel ternary material and coating technology, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of high residual alkali on the surface of the material, unstable structure, high pH value, etc., and improve the rate discharge performance , maintain integrity, reduce the effect of material PH value

Inactive Publication Date: 2019-04-26
WUXI JEWEL POWER & MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nickel cobalt lithium manganate material LiNi x mn y co z o 2 In (x+y+z=1), the value of x is higher than 0.6, which is generally called high-nickel ternary material, and there are two main reasons that restrict the wide application

Method used

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  • Coating method of high-nickel ternary material
  • Coating method of high-nickel ternary material
  • Coating method of high-nickel ternary material

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0022] Example 1: Ternary NCM811 material coating two burnt

[0023] Get one part of LiNi0.8Co0.1Mn0.1O2, a sintered product of ternary 811 material, and fully mix it with 0.005 part (weight ratio) of fine powder EMD material;

[0024] The mixed material is kept moist in the air at 700 degrees Celsius for 3-5 hours to obtain the finished ternary NCM811 material.

Embodiment 2

[0025] Embodiment 2: Coated dicalcination of nickel-cobalt-aluminum NCA cathode material

[0026] Get a part of the nickel-cobalt-aluminum NCA positive electrode material one-sintered product, fully mix it with the fine powder EMD material of 0.005 part (weight ratio);

[0027] The mixed material is kept moist in the air at 700 degrees Celsius for 3-5 hours to obtain the finished ternary NCM811 material.

[0028] figure 1 It is a diagram of the sintering reaction process of the high-nickel ternary material; figure 2 is the fine powder EMD particle size distribution diagram; image 3 SEM image of finished product;

[0029] Figure 4 is a cyclic comparison chart. refer to Figure 1~4 , the present invention has the following advantages: the present invention can reduce the pH value of the material and the residual alkali on the surface. The PH value of the material can be reduced from the original 12 or more to 11.5-11.8; since the PH value of the coating agent EMD parti...

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Abstract

The invention discloses a coating method of a high-nickel ternary material. The coating method comprises the following steps of S1, primary sintering, wherein after a high-nickel ternary precursor ismixed with a lithium hydroxide raw material according to a ratio, the mixture is subjected to heat preservation for 5-12 h in the range of 750-890 DEG C under the oxygen introduction condition, and after the temperature is reduced to 400 DEG C or below under the oxygen introduction condition, the mixture is naturally cooled and subjected to coarse crushing to obtain a once-sintered high-nickel ternary material; S2, coating, wherein superfine electrolytic manganese dioxide serves as a coating agent and is fully mixed with the once-sintered product in S1; moisture preservation is carried out onthe mixed material at 650-750 DEG C in the air atmosphere, and a high-nickel ternary material finished product is obtained. A brand new coating mode is utilized, residual alkali on the surface of thematerial is reduced, and high-temperature deoxygenization is inhibited, so that the electrochemical performance and process processing performance of a nickel-cobalt lithium manganate material are improved.

Description

technical field [0001] The invention relates to a coating method of a high-nickel ternary material. Background technique [0002] Nickel cobalt lithium manganese oxide material, known as ternary material in the industry, chemical general formula LiNi x mn y co z o 2 (x+y+z=1), as the positive electrode material of lithium-ion batteries, is widely used in the fields of communication, electric tools, electric bicycles and electric vehicle power batteries. For the production method of nickel-cobalt-manganese lithium manganate material, the mainstream synthesis method in the industry is the high-temperature solid-phase method, which not only selects solid compounds such as lithium oxides or carbonates, but also combines them with hydroxides of nickel-cobalt-manganese (ternary precursors) ) are mixed evenly, and reacted to generate nickel-cobalt-lithium manganese oxide material by high-temperature burning. [0003] Nickel cobalt lithium manganate material LiNi x mn y co z...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 马岩华杨红艳钱飞鹏赵春阳李佳军邓亚烽陆科炯
Owner WUXI JEWEL POWER & MATERIALS
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