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811NCM ternary cathode material of three-dimensional nanowire array structure and preparation method thereof

A three-dimensional nano, cathode material technology, applied in the field of electrochemical applications, can solve the problems of particle breakage, incomplete precipitation, particle agglomeration, etc., achieve uniform size, good shape, and improve the effect of particle agglomeration

Pending Publication Date: 2020-03-06
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the precipitation process, the change of the pH value of the solution has a direct impact on the precipitation of the three elements of nickel, cobalt, and manganese. If it is too high or too low, it will easily lead to incomplete precipitation; in addition, the solution speed also has a great influence on the morphology of the material. If the speed is too low, the particles will be agglomerated, and if the speed is too high, the particles will be broken.

Method used

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  • 811NCM ternary cathode material of three-dimensional nanowire array structure and preparation method thereof
  • 811NCM ternary cathode material of three-dimensional nanowire array structure and preparation method thereof
  • 811NCM ternary cathode material of three-dimensional nanowire array structure and preparation method thereof

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Embodiment 1

[0024] The 811NCM ternary cathode material in this example has a layered crystal structure, and its microscopic appearance is as follows: after the self-assembly of primary spherical single crystal particles into nanowires, these nanowires self-assemble into a strip-like array structure Morphology, the particle size is basically between about 10 μm in length and about 2 μm in width.

[0025] The preparation method of the present embodiment, the steps are as follows:

[0026] Step (1), dissolving 0.08mol of nickel acetate, 0.01mol of manganese acetate and 0.01mol of cobalt acetate in 100mL of deionized water, stirring evenly until completely dissolved; then adding 0.2mol of oxalic acid powder, stirring evenly until the oxalic acid is completely dissolved, Obtain the mixed solution, the measured pH value is 5, then add the concentration of 0.01mol L -1 The ammonia solution adjusts pH=7;

[0027] Step (2): Take 80mL of the mixed solution prepared in step (1) and pour it into a ...

Embodiment 2

[0036] The 811NCM ternary positive electrode material in this embodiment has a layered crystal structure, and its microscopic appearance is as follows: after the self-assembly of spherical single crystal particles into nanowires, these nanowires self-assemble into The shape of the strip-shaped array structure, the particle size is basically between about 50 μm in length and about 3 μm in width.

[0037] The preparation method of the present embodiment, the steps are as follows:

[0038] Step (1), dissolve 0.04mol of nickel chloride and 0.04mol of nickel acetate in 20mL of ethylene glycol solution and stir until completely dissolved to obtain solution A; dissolve 0.005mol of cobalt chloride and 0.005mol of cobalt acetate Stir in 20mL of ethylene glycol solution until completely dissolved to obtain solution B; dissolve 0.005mol of manganese chloride and 0.005mol of manganese acetate in 20mL of ethylene glycol solution and stir until completely dissolved to obtain solution C; So...

Embodiment 3

[0048] An 811NCM ternary positive electrode material with a three-dimensional nanowire array structure, the crystal structure is a layered structure, and the microscopic appearance is: after the self-assembly of spherical single crystal particles into nanowires, these nanowires self-assemble into long Striped array structure morphology, the particle size is basically between 10 μm in length and 1 μm in width.

[0049] A preparation method of 811NCM ternary cathode material with a three-dimensional nanowire array structure, the steps are as follows:

[0050] Step (1), dissolve 0.004 mol of nickel acetate and 0.004 mol of nickel sulfate in a mixed solution of 20 mL of deionized water and glycerin (the ratio of deionized water to glycerin is 2:1), stir well until completely dissolved to obtain solution A; dissolve 0.004mol of cobalt acetate and 0.004mol of cobalt sulfate in 20mL of deionized water and glycerol mixed solution (the ratio of deionized water to glycerol is 2:1) , st...

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Abstract

An 811NCM ternary cathode material of three-dimensional nanowire array structure and a preparation method thereof are disclosed. The micromorphology of the ternary positive electrode material is characterized in that primary spherical single-crystal particles are self-assembled into a nanowire, and then the nanowires are self-assembled into a strip-shaped array structure, wherein the particle hasa length of 10[mu]m to 50[mu]m, and a width of 1[mu]m to 3[mu]m. The preparation method comprises: dissolving a nickel salt, a cobalt salt and a manganese salt in a solvent by a solvothermal method; adding ammonia water or sodium hydroxide to adjust the pH value; performing a solvothermal reaction at a certain temperature for 10-24 hours; after the synthesized oxalate precipitate containing nickel-cobalt-manganese is mixed with a lithium source uniformly, calcining the mixture at high temperature to obtain the 811NCM ternary cathode material. The preparation process is simple in operation andlow in cost. In the synthesis process, ethylene glycol or glycerol is used as both a solvent and a dispersant. Compared with a co-precipitation method, the method improves particle agglomeration. Thecrystal structure of a final product is layered structure with a large specific area, thereby helping an electrolyte to further wet the material and further improving the electrochemical performanceof a battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemical applications, and in particular relates to an 811NCM ternary anode material with a three-dimensional nanowire array structure and a method for preparing the 811NCM ternary anode material with a three-dimensional nanowire array structure by solvothermal. Background technique [0002] Nowadays, the research and development of lithium-ion batteries with high energy density has played a key role in the continuous improvement of energy storage demand. Lithium-ion batteries have the advantages of high working voltage, less self-discharge, high energy density, small memory effect, long cycle life, and environmental protection. Compared with lithium-ion battery negative electrode materials, positive electrode materials show more deficiencies in terms of capacity and safety, and positive electrode materials become the key to determining the overall performance of batteries, so further research and ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M10/0525C01G53/006H01M2004/028C01P2002/72C01P2004/03C01P2004/61Y02E60/10
Inventor 王娟顾虹同家欣齐宁王祯涛黄会星付永红杨乃欣
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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