Modified high-nickel positive electrode material and preparation method thereof

A positive electrode material and high-nickel technology, applied in chemical instruments and methods, battery electrodes, nickel compounds, etc., can solve the problems of reducing the discharge capacity and cycle life of materials, increasing the difficulty of pulping and coating, and serious battery gas production. Achieve the effects of improving structural stability and cycle stability, alleviating gas production, and reducing the amount of residual alkali on the surface

Pending Publication Date: 2020-09-01
SHAANXI COAL & CHEM TECH INST
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Problems solved by technology

However, the high nickel content of the positive electrode material makes it more sensitive to moisture, and the surface is prone to generate relatively high alkaline substances lithium hydroxide and lithium carbonate, which reduces the stability of the surface/interface of the material, especially after washing and drying. Obviously, th

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  • Modified high-nickel positive electrode material and preparation method thereof
  • Modified high-nickel positive electrode material and preparation method thereof

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preparation example Construction

[0032] A preparation method for surface modification of a high-nickel positive electrode material, comprising the following steps:

[0033] Step 1: Raw material preparation: Mix the precursor of high-nickel positive electrode material, additives and lithium source evenly, place it in high-temperature equipment for primary sintering under an oxygen atmosphere, and obtain a primary sintered high-nickel positive electrode material after crushing and sieving the material;

[0034] Step 2: mixing and stirring the primary sintered high-nickel positive electrode material with deionized water, separating the solid from the liquid, and drying the solid to obtain the primary sintered high-nickel positive electrode material after washing and drying;

[0035] Step 3: Place the primary sintered high-nickel positive electrode material after washing and drying in a high-temperature device to perform a surface treatment to obtain a surface-treated high-nickel positive electrode material;

[0...

Embodiment 1

[0056] Step 1. Mix lithium hydroxide, nickel-cobalt-aluminum hydroxide and additive magnesium hydroxide uniformly to obtain a mixture, wherein the molar ratio of the three metal elements of nickel-cobalt-aluminum in the nickel-cobalt-aluminum hydroxide precursor is 91:6: 3, that is, x is 0.06, y is 0.03, the ratio of the amount of lithium hydroxide to the precursor of nickel-cobalt-aluminum hydroxide is 0.9:1, that is, n is 0.9, and the content of magnesium in magnesium hydroxide is nickel-cobalt-aluminum 0.5% of the amount of hydroxide species, ie z is 0.05.

[0057] The mixture is placed in high-temperature equipment and calcined under an oxygen atmosphere. The calcining is carried out in two stages. The first stage calcining temperature is 420°C and the holding time is 10h. The second stage calcining temperature is 650°C and the holding time is 16h. Then Cooling, crushing, and sieving through a 300-mesh sieve to obtain a primary sintered nickel-cobalt-lithium aluminate tern...

Embodiment 1 and comparative example 1

[0064] Embodiment 1 and comparative example 1 performance detection

[0065] Using the lithium cobalt aluminate with low lithium ratio in Example 1 of the present invention and the lithium cobalt aluminate with high lithium ratio in Comparative Example 1, respectively take 5g of powder samples and place them in 95g of deionized aqueous solution, stir for 5min and then suction filter. Use the Mettler toledo T50 potentiometric titrator to measure Li in the solution in the material according to the equivalence point 2 CO 3 and the content of LiOH, and take the content as the residual alkali content on the surface of the material. It can be seen from Table 1 that the nickel-cobalt-aluminum anode material prepared with a lower lithium ratio in Example 1 of the present invention has significantly lower residual alkali on the surface of the material.

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Abstract

A preparation method of a modified high-nickel positive electrode material comprises the following steps: uniformly mixing a high-nickel positive electrode material precursor, an additive and a lithium source, carrying out primary sintering in an oxygen atmosphere, crushing, and sieving to obtain a primary sintered high-nickel positive electrode material; washing the primary sintered high-nickel positive electrode material with water, and drying to obtain a washed and dried primary sintered high-nickel positive electrode material; performing primary surface treatment on the washed and dried primary sintered high-nickel positive electrode material to obtain a primary surface treated high-nickel positive electrode material; and uniformly mixing the modifier with the primary surface treatmenthigh-nickel positive electrode material, and then carrying out secondary surface treatment to obtain the modified high-nickel positive electrode material. The residual alkali amount on the surface ofthe material and the specific surface area of a final product are reduced, so that the impedance on the surface of the material is obviously reduced, the gas production phenomenon of the battery is obviously relieved, the structural stability and the cycling stability of the material are improved, the processability of the positive electrode material in the preparation process can be improved, the preparation condition is easy to control, and mass production can be realized.

Description

technical field [0001] The invention relates to positive electrode materials, in particular to a modified high-nickel positive electrode material and a preparation method thereof. Background technique [0002] Due to the advantages of low raw material cost, high charge-discharge voltage, high charge-discharge specific capacity and high energy density, high-nickel cathode materials have shown great potential for development in the lithium-ion battery market, and have quickly become the research and development center in the field of lithium-ion battery cathode materials. and application hotspots. However, the high nickel content of the positive electrode material makes it more sensitive to moisture, and the surface is prone to generate relatively high alkaline substances lithium hydroxide and lithium carbonate, which reduces the stability of the surface / interface of the material, especially after washing and drying. Obviously, thereby reducing the discharge capacity and cycl...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/50C01G53/006H01M4/525H01M4/505H01M10/0525C01P2006/40C01P2006/12Y02E60/10
Inventor 张超寇亮张诚徐可孙静王继峰田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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