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Nickel cobalt lithium manganate composite material and preparation method thereof

A technology of nickel-cobalt lithium manganate and composite materials, applied in the field of lithium-ion batteries, can solve the problems of decreased electrical properties of materials, material structural defects, aggravated lithium volatilization, etc., to achieve high compaction density and energy density, stable material structure, Simple preparation process

Inactive Publication Date: 2020-06-30
ZHONGTIAN EMERGING MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the layered nickel-cobalt-lithium manganese oxide cathode material on the market is dominated by the morphology of secondary particles. During the battery preparation process, the secondary particles are easily broken during the compaction process, and with the increase of charge-discharge voltage and charge times , the surface of the material is corroded and pulverized by the electrolyte, resulting in the collapse of the material structure, which will lead to rapid decay of the battery capacity, poor cycle performance, and poor safety performance of the battery, etc. The single crystallization of the material morphology can well solve the above two problems The problem of secondary particles can improve the cycle performance and safety performance of materials, but single crystallization will also bring adverse effects. On the one hand, the preparation of single crystal materials needs to be carried out at higher sintering temperatures, and excessive sintering temperatures will aggravate The volatilization of lithium causes defects in the material structure and reduces the material performance; on the other hand, the primary particle size of the single crystal material is generally about 5 μm, which is much larger than the 1.0-1.5 μm primary particle size of the polycrystalline material, and the growth of the primary particle size leads to Lithium ion transport path increases, material electrical properties decrease

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  • Nickel cobalt lithium manganate composite material and preparation method thereof
  • Nickel cobalt lithium manganate composite material and preparation method thereof
  • Nickel cobalt lithium manganate composite material and preparation method thereof

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preparation example Construction

[0025] see figure 1 , figure 1 It is a schematic flow diagram of the preparation method of the nickel-cobalt lithium manganese oxide composite material in one embodiment of the present invention, specifically comprising the following steps:

[0026] S11, the ternary precursor Ni x co y mn z (OH) 2 , lithium salt and co-solvent are uniformly mixed according to a predetermined ratio to obtain a first mixed material, wherein the sum of X, Y and Z is 1;

[0027] S12, calcining the first mixed material, then cooling, pulverizing, sieving, and removing iron from the cooled material to obtain a single crystal nickel cobalt lithium manganese oxide material Li 1 + x Ni x co y mn z o 2 ;

[0028] S13, uniformly mixing the prepared single crystal nickel cobalt lithium manganese oxide material with carbon source and metal oxide according to a predetermined ratio to obtain a second mixed material;

[0029] S14, calcining the second mixed material, then cooling, pulverizing, sie...

Embodiment 1

[0044] Take 1000g ternary precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 , 431.5g of lithium carbonate and 7.1536g of boron oxide were mixed in a mixer for 4 hours, and the mixed material was put into a calciner, fed with dry air, sintered at 940°C for 20 hours and then cooled, and the cooled The material is pulverized in a small airflow machine, the particle size is controlled at 4-7μm, and then the iron is sieved to obtain a single crystal nickel cobalt lithium manganese oxide material, which is recorded as NCM-1; take 900g of the prepared single crystal nickel cobalt lithium manganese oxide material Material, 1.8g polyethylene glycol and 4.5g Al 2 o 3 Put it in a ball mill and mix it for 2 hours, put the mixed material into the calcination device, pass in nitrogen gas, sinter at 600°C for 8 hours and then cool it, pulverize the cooled material in a mechanical pulverizer, and pass through a sieve The single-crystal nickel-cobalt-lithium manganese oxide composite material coated ...

Embodiment 2

[0046] Take 1000g ternary precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 , 431.5g of lithium carbonate and 8.6291g of aluminum fluoride were mixed in a mixer for 4 hours, the mixed material was put into a calcination device, fed with dry air, sintered at 980°C for 20 hours and then cooled, and the cooled The final material is pulverized in a small airflow machine, and the particle size is controlled at 4-7 μm, and then the single crystal nickel cobalt lithium manganese oxide material is obtained by sieving iron, which is recorded as NCM-1; take 900g of the prepared single crystal nickel cobalt manganese acid Lithium material, 1.8g glucose and 4.5g ZrO 2 Put it in a ball mill and mix it for 2 hours, put the mixed material into the calcination device, pass in nitrogen gas, sinter at 500°C for 8 hours and then cool it down, pulverize the cooled material in a mechanical pulverizer, and pass through a sieve The single-crystal nickel-cobalt-lithium manganese oxide composite material coat...

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Abstract

The invention provides a single-crystal lithium nickel cobalt manganese oxide composite material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing a ternary precursor, a lithium salt and a cosolvent in a mixer according to a preset ratio; calcining the mixed material in an oxygen-enriched atmosphere, cooling, crushing the cooled material, sieving, and removing iron to obtain a single crystal lithium nickel cobalt manganese oxide material; uniformly mixing the prepared material with a carbon source and a metal oxide in a ball mill accordingto a preset proportion; and calcining the mixed material in an inert atmosphere, cooling, crushing the cooled material, sieving the cooled material, and removing iron to obtain the carbon and metal oxide composite coated single crystal lithium nickel cobalt manganese oxide composite material. According to the single-crystal lithium nickel cobalt manganate composite material and the preparation method thereof, the preparation process is simple, and the prepared material is stable in structure and excellent in rate capability and has excellent cycle performance and conductivity.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a nickel-cobalt lithium manganate composite material and a preparation method thereof. Background technique [0002] At present, the layered nickel-cobalt-lithium manganese oxide cathode material on the market is dominated by the morphology of secondary particles. During the battery preparation process, the secondary particles are easily broken during the compaction process, and with the increase of charge-discharge voltage and charge times , the surface of the material is corroded and pulverized by the electrolyte, resulting in the collapse of the material structure, which will lead to rapid decay of the battery capacity, poor cycle performance, and poor safety performance of the battery, etc. The single crystallization of the material morphology can well solve the above two problems The problem of secondary particles can improve the cycle performance and safety pe...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 张刚缪永华战鹏钱旭李明祥蔡陈楠
Owner ZHONGTIAN EMERGING MATERIALS CO LTD
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