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Modified lithium nickel cobalt manganese cathode material and production method thereof

A technology of lithium nickel cobalt manganese and cathode materials, applied in the field of lithium ion batteries, can solve the problems of poor storage performance, fast side reactions, large specific surface area, etc., and achieve the effects of high safety, high power density and long service life

Active Publication Date: 2018-01-16
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in practical applications, NCM materials with small particle sizes have a large specific surface area and a large contact area with the electrolyte, so they have excellent kinetic properties, but at the same time have fast side reactions and poor storage performance. If the above-mentioned bulk phase doping or surface coating is used method, there will be loss of discharge capacity or power performance

Method used

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  • Modified lithium nickel cobalt manganese cathode material and production method thereof
  • Modified lithium nickel cobalt manganese cathode material and production method thereof
  • Modified lithium nickel cobalt manganese cathode material and production method thereof

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preparation example Construction

[0025] Next, the preparation method of the modified lithium-nickel-cobalt-manganese positive electrode material according to the second aspect of the present invention is described, which is used to prepare the modified lithium nickel-cobalt-manganese positive electrode material described in the first aspect of the present invention, comprising the steps of: (1) adding the nickel salt , cobalt salt, and manganese salt are made into a mixed solution according to the atomic ratio Ni:Co:Mn=x:y:z, and then are added dropwise to the reaction vessel together with the solution of the first doping compound for reaction, and are dried to obtain Precursor (Ni x co y mn z )(OH) 2 / M γ R δ , the first doping compound is selected from MR, MR 2 、MR 3 、MR 4 , M 3 R 2 , M 4 R 3 , M 2 R, M 2 R 3 One or more of them; (2) the precursor (Ni x co y mn z )(OH) 2 / M γ R δ It is evenly mixed with lithium salt according to the atomic ratio Li:(Ni+Co+Mn)=a:1, and then calcined to ob...

Embodiment 1

[0057] NiSO 4 、CoSO 4 , MnSO 4 According to the atomic ratio Ni:Co:Mn=0.35:0.35:0.30, a mixed aqueous solution is prepared, wherein the total concentration of cations is 2mol / L.

[0058] The mixed aqueous solution, 2mol / L NaOH solution, 3mol / L ammonia solution and the first doping compound ZrP 2 The aqueous dispersion liquid is added dropwise into the reaction vessel, the pH value of the system is controlled at 11.0±0.2, and the water bath is heated to 50° C. for the reaction. Among them, the first doping compound ZrP 2 The amount of addition is guaranteed to be based on the atomic ratio P:(Ni+Co+Mn)=0.0005:1 (ie δ=0.0005, γ=0.00025). Control the D50 of the precipitate to reach 3 μm to 4 μm, stop feeding, age for 2 hours, press filter, wash, and blast dry for 8 hours to obtain the precursor powder.

[0059] The obtained precursor powder was mixed with lithium salt Li 2 CO 3According to the atomic ratio Li:(Ni+Co+Mn)=1.1:1, the ball mill is evenly mixed, and placed in an...

Embodiment 2

[0061] NiSO 4 、CoSO 4 , MnSO 4 According to the atomic ratio Ni:Co:Mn=0.35:0.35:0.30, a mixed aqueous solution is prepared, wherein the total concentration of cations is 2mol / L.

[0062] The mixed aqueous solution, 2mol / L NaOH solution, 3mol / L ammonia solution and the first doping compound ZrP 2 The aqueous dispersion liquid is added dropwise into the reaction vessel, the pH value of the system is controlled at 11.0±0.2, and the water bath is heated to 50° C. for the reaction. Among them, the first doping compound ZrP 2 The amount of addition is guaranteed to be based on the atomic ratio P:(Ni+Co+Mn)=0.0005:1 (ie δ=0.0005, γ=0.00025). Control the D50 of the precipitate to reach 3 μm to 4 μm, stop feeding, age for 2 hours, press filter, wash, and blast dry for 8 hours to obtain the precursor powder.

[0063] The obtained precursor powder was mixed with lithium salt Li 2 CO 3 According to the atomic ratio Li:(Ni+Co+Mn)=1.1:1, the ball mill is evenly mixed, and placed in a...

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Abstract

The invention provides a modified lithium nickel cobalt manganese cathode material and a production method thereof. A general formula of the modified lithium nickel cobalt manganese cathode material is LiaNixCoyMnzMgammaO2-deltaRdelta; wherein a is greater than or equal to 1.03 and less than or equal to 1.23; x is greater than 0 and less than or equal to 0.9; y is greater than 0 and less than or equal to 1; z is greater than 0 and less than or equal to 1; the sum of x, y and z is 1; gamma is greater than 0 and less than or equal to 0.075; and delta is greater than 1 and less than or equal to 0.05; the doped element M is selected from one or more of Ni, Co, Mn, Sn, Mg, Ca, Ti, Zr, V, Nb, Mo, W, Al, and B, the doped element R is selected from one or more of N, P, S, Si, and Se, and the dopedM and the doped element R are positioned at the grain boundary. In the invention, grain-boundary doping is carried out on a conventional lithium nickel cobalt manganese cathode material, and the obtained modified lithium nickel cobalt manganese cathode material still has a stable structure during a repeated charge and discharge process of intense current.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a modified lithium nickel cobalt manganese cathode material and a preparation method thereof. Background technique [0002] Compared with other traditional secondary batteries, lithium-ion batteries have many advantages such as small size, high voltage, and high energy density, and have made a series of great progress in the fields of consumer electronics such as mobile phones and notebooks. With the vigorous development of the new energy industry, more and more researchers are actively developing lithium-ion batteries with high power density, high cycle stability, and high safety, hoping to use them as power batteries for electric vehicles. [0003] Among the many positive electrode materials used in lithium-ion batteries, the layered lithium-nickel-cobalt-manganese (NCM) positive electrode material is considered to be the future power lithium-ion battery because o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 郎野徐中领高旭光徐磊敏
Owner NINGDE AMPEREX TECH
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