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Core-shell structure NCM (nickel manganese cobalt) ternary cathode material containing carbon nanotube and preparation method thereof

A technology of positive electrode material and core-shell structure, which is applied in the field of core-shell structure NCM ternary positive electrode material containing carbon nanotubes and its preparation, can solve the problems of unsuitability and extremely poor capacity retention of electric vehicles, and achieve high capacity, Increased rate capability and improved electrochemical performance

Inactive Publication Date: 2018-09-14
UNIV OF SCI & TECH BEIJING
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  • Summary
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the long service life required by electric vehicles, LiNiO 2 The extremely poor capacity retention of the material is very unsuitable for electric vehicles

Method used

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  • Core-shell structure NCM (nickel manganese cobalt) ternary cathode material containing carbon nanotube and preparation method thereof

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preparation example Construction

[0054] The preparation method of the core-shell structure NCM ternary cathode material comprising carbon nanotubes of the present invention mainly comprises the following steps:

[0055] (1) Use a solvent to dissolve a certain stoichiometric amount of nickel compounds, and mix them uniformly to form a nickel compound solution. Mix the nickel compound with the complexing agent and the precipitating agent solution, and use the co-precipitation reaction to prepare the core precursor material solution of the core-shell structure NCM ternary cathode material;

[0056] (2) In the presence of a complexing agent and / or a precipitating agent, add nickel compounds, cobalt compounds, The mixed solution of manganese compound is subjected to co-precipitation reaction to obtain nickel-cobalt manganese compound with core-shell structure;

[0057] (3) After mixing the nickel-cobalt-manganese compound containing the core-shell structure and the lithiated compound prepared in the step (2), roa...

Embodiment 1

[0077] First, the Ni(NO 3 ) 2 ·6H 2 O aqueous solution is continuously pumped into a certain amount of deionized water, NaOH (aqueous solution) and NH 4 OH (aqueous) reaction vessel. At the same time, NaOH (4.0M, aqueous solution) (the molar ratio of sodium hydroxide to transition metal is 2.0) and a sufficient amount of NH 4 OH (aqueous solution) (the molar ratio of ammonia water to transition metal ions is 1.2) is pumped into the reaction vessel as a chelating agent. During the synthesis process, high-speed stirring was used to make the initially formed Ni(OH) 2 The particles are spherical.

[0078] In order to form the core-shell structure, the corresponding shell structure component [Ni 0.8 co 0.1 mn 0.1 ](OH) 2 Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O aqueous solution and Mn(NO 3 ) 2 The solution (the molar ratio Ni:Co:Mn=8:1:1) is pumped into the reaction vessel at a certain rate, and the pH value in the vessel is maintained, and the stirring rate is con...

Embodiment 2

[0085] First, the Ni(NO 3 ) 2 ·6H 2 O aqueous solution is continuously pumped into a certain amount of deionized water, NaOH (aqueous solution) and NH 4 OH (aqueous solution) reaction vessel. At the same time, NaOH (4.0M, aqueous solution) (the molar ratio of sodium hydroxide to transition metal is 1.8) and a sufficient amount of NH 4 OH (aqueous solution) (the molar ratio of ammonia water to transition metal ions is 1.5) is pumped into the reaction vessel as a chelating agent. During the synthesis process, high-speed stirring was used to make the initially formed Ni(OH) 2 The particles are spherical.

[0086] In order to form the core-shell structure, the corresponding shell structure component [Ni 0.5 co 0.2 mn 0.3 ](OH) 2 Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O aqueous solution and Mn(NO 3 ) 2 The solution (molar ratio Ni:Co:Mn=5:2:3) is pumped into the reaction vessel at a certain rate, and the pH value and stirring rate in the vessel are kept constant. ...

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Abstract

The invention provides a core-shell structure NCM (nickel manganese cobalt) ternary cathode material containing carbon nanotube and a preparation method thereof and belongs to the field of lithium ionbattery materials. The core-shell structure NCM ternary cathode material containing the carbon nanotube comprises a material body and a single-walled or multi-walled carbon nanotube, wherein the material body is composed of a core and a shell layer, and the carbon nanotube is contained on the surface of the shell layer. The preparation method thereof includes the steps of firstly preparing mixedsolution of a nickel compound and hydroxide, conducting coprecipitation reaction of mixed solution and the mixed solution of the nickel compound and the hydroxide to prepare nickel precursor core precipitate precursor solution, adding mixed solution of a nickel compound, a cobalt compound and a manganese compound to the prepared precursor solution for coprecipitation reaction to obtain a mixture of a lithium compound and a NCM compound containing the core-shell structure, roasting in air or oxygen to obtain the NCM ternary cathode material with the core-shell structure to be then fully mixed with the carbon nanotube, and finally obtaining the core-shell structure NCM ternary cathode material conntaining thecarbon nanotube. The core-shell structure NCM (nickel manganese cobalt) ternary cathode material containing carbon nanotube and the preparation method have the advantages of significantly improving material cycle performance while maintaining high capacity properties of the material,and having great application value in the field of energy storage.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a core-shell structure NCM ternary cathode material containing carbon nanotubes and a preparation method thereof. Background technique [0002] The research and development of electric vehicles (EVs) is a national key research and development field, and it is also one of the hot spots in the market. But consumer acceptance of EVs remains low, largely because of their high cost per kilometer driven. Most compact electric vehicles have a range of less than 300km on a single charge, which is only 20% of that of similarly priced internal combustion engine powered vehicles. In order to reduce the driving cost per kilometer of existing electric vehicles to a level that can compete with internal combustion engine-driven vehicles, batteries with long life and high energy density need to be developed. [0003] Among all batteries currently on the market, lithium-...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/52H01M4/62
CPCH01M4/505H01M4/523H01M4/625Y02E60/10
Inventor 薛文东戎马屹飞胡凯王兴宇王玉田白立雄李勇
Owner UNIV OF SCI & TECH BEIJING
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