Modified Ni-Co-Mn ternary material and preparation method thereof

A ternary material, nickel-cobalt-manganese technology, used in electrical components, electrochemical generators, battery electrodes, etc., can solve the problem of low lithium ion diffusion coefficient and electronic conductivity, low first charge and discharge efficiency of ternary materials, and material The rate performance is not very ideal, etc., to achieve the effect of improving electrochemical performance, improving charge and discharge efficiency, excellent electrical conductivity and mechanical strength

Inactive Publication Date: 2019-06-14
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the NCM ternary cathode material has many of the above advantages, due to the cation mixing effect and the change of the surface microstructure of the material during the first charging process, the first charge and discharge efficiency of the ternary material is not high; and the lithium ion diffusion coefficient and ele

Method used

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  • Modified Ni-Co-Mn ternary material and preparation method thereof
  • Modified Ni-Co-Mn ternary material and preparation method thereof
  • Modified Ni-Co-Mn ternary material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A modified nickel-cobalt-manganese ternary material and a preparation method thereof, comprising the steps of:

[0033] 1) 13.35g AlCl 3 Dissolved in deionized water, after complete dissolution, the AlCl 3 Add 4mol precursor Ni to the solution x co y mn z (OH) 2 , where x:y:z=5:2:3, the molar ratio of Al / (Ni+Co+Mn) is 2.5%, and mixture A is obtained after stirring;

[0034] 2) Sodium hydroxide, ammonia water and ammonium sulfate are mixed at a mass ratio of 12:3:1 to obtain a mixed base B, and the mixed base B is slowly added to the beaker containing the mixture A, and the entire beaker is placed in an ultrasonic water bath, The ultrasonic power is 800W, the temperature of the water bath is 35°C, and after 4 hours of reaction, the obtained precipitate is filtered, washed, and dried to obtain the precursor C;

[0035] 3) Mix the precursor C and lithium carbonate according to the metering ratio, wherein the molar ratio of Li / (Ni+Co+Mn) is 1.05, after the preliminary...

Embodiment 2

[0064] A modified nickel-cobalt-manganese ternary material and a preparation method thereof, comprising the steps of:

[0065] 1) 13.35g AlCl 3 Dissolved in deionized water, after complete dissolution, the AlCl 3 Add 2mol precursor Ni to the solution x co y mn z (OH) 2 , where x:y:z=6:2:2, the molar ratio of Al / (Ni+Co+Mn) is 5%, and mixture A is obtained after stirring;

[0066] 2) Mix potassium hydroxide, ammonia water and ammonium nitrate at a mass ratio of 2:1:1 to obtain a mixed base B, slowly add the mixed base B to the beaker containing the mixture A and place the entire beaker in an ultrasonic water bath, The ultrasonic power is 800W, the temperature of the water bath is 35°C, after 3 hours of reaction, the obtained precipitate is filtered, washed and dried to obtain the precursor C;

[0067] 3) Mix the precursor C and lithium carbonate according to the metering ratio, wherein the molar ratio of Li / (Ni+Co+Mn) is 1.1, and then use a ball mill to perform ball millin...

Embodiment 3

[0072] A modified nickel-cobalt-manganese ternary material and a preparation method thereof, comprising the steps of:

[0073] 1) 13.35g AlCl 3 Dissolved in deionized water, after complete dissolution, the AlCl 3 Add 10mol precursor Ni to the solution x co y mn z (OH) 2 , where x:y:z=8:1:1, the molar ratio of Al / (Ni+Co+Mn) is 1%, and mixture A is obtained after stirring;

[0074] 2) Sodium hydroxide, ammonia water and ammonium sulfate are mixed at a mass ratio of 15:5:1 to obtain a mixed base B, and the mixed base B is slowly added to the beaker containing the mixture A, and the entire beaker is placed in an ultrasonic water bath, The ultrasonic power is 800W, the temperature of the water bath is 35°C, and after 4 hours of reaction, the obtained precipitate is filtered, washed, and dried to obtain the precursor C;

[0075] 3) Mix the precursor C and lithium carbonate according to the metering ratio, wherein the molar ratio of Li / (Ni+Co+Mn) is 1.06, after the preliminary ...

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Abstract

The invention discloses a modified Ni-Co-Mn ternary material. The material is a core-shell structure, and an inner core is aluminum-doped Ni-Co-Mn ternary material, and the shell is a carbon claddinglayer; the mole ratio of the Ni: Co: Mn in the inner core is 8: 1: 1 to 5: 2: 3, the mole ratio of the Al/(Ni+Co+Mn) is 1%-5%, the shell is the carbon-cladding layer with uniform thickness, and the weight of the carbon cladding layer is 0.5%-2% of the total weight of the modified Ni-Co-Mn ternary material. By optimizing the doping amount of the Al and the carbon cladding layer thickness, the material capacity is further improved. The invention further discloses a preparation method of the material at the same time. The material can be used as positive active materials of the lithium primary battery, a lithium secondary battery, a lithium ion secondary battery and like lithium batteries; and the modified Ni-Co-Mn ternary material has excellent electrochemical performances of being high in specific capacity, high in conductivity and good in stability.

Description

technical field [0001] The invention relates to the field of cathode materials for lithium ion secondary batteries, in particular to a modified nickel-cobalt-manganese ternary material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less self-discharge, no memory effect and high cost performance, and have become a research hotspot for researchers. Cathode material is one of the core parts of lithium-ion batteries, which determines the performance of lithium-ion batteries. At present, the biggest bottleneck that limits the energy density, power density, cycle life and safety of lithium-ion power batteries lies in the cathode material technology. [0003] At present, the nickel-cobalt-lithium-manganese oxide ternary material (NCM) in the cathode material of lithium-ion batteries has received extensive attention from researchers. The NCM mater...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/583H01M10/0525
CPCY02E60/10
Inventor 徐宁吕菲孙瑞军
Owner TIANJIN B&M SCI & TECH
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