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High energy density nickel cobalt lithium manganese oxide positive electrode material and preparation method thereof

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor structural stability and electrical properties, and achieve improved compaction density, increased median particle size, The effect of increasing energy density

Active Publication Date: 2021-08-27
当升科技(常州)新材料有限公司
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  • Description
  • Claims
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Problems solved by technology

[0009] The purpose of the present invention is to provide a high energy density lithium nickel cobalt manganese oxide positive electrode material and its preparation method in order to overcome the structural stability and poor electrical properties of lithium nickel cobalt manganese oxide positive electrode material existing in the prior art , the nickel-cobalt-lithium-manganese-oxide positive electrode material is a single crystal type, and has the advantages of large median particle size, high compaction density, high charging voltage, excellent electrical performance, and high structural stability, and the preparation method is simple in process and can be applied to mass production

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  • High energy density nickel cobalt lithium manganese oxide positive electrode material and preparation method thereof
  • High energy density nickel cobalt lithium manganese oxide positive electrode material and preparation method thereof
  • High energy density nickel cobalt lithium manganese oxide positive electrode material and preparation method thereof

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preparation example Construction

[0089] The second aspect of the present invention provides a method for preparing a nickel-cobalt lithium manganese oxide positive electrode material, comprising the following steps:

[0090] 1) Nickel salt, cobalt salt, and manganese salt are formulated into a mixed salt solution according to the molar ratio of Ni:Co:Mn=x:y:(1-x-y); the precipitant, complexing agent, dispersant, and additive a are respectively formulated as a solution;

[0091] 2) Pass the mixed salt solution, the precipitant solution, the complexing agent solution, the dispersant solution, and the additive a solution into the reaction kettle at the same time and respectively, under an inert atmosphere, carry out the first reaction, and continue to stir for aging, Obtain a solid-liquid mixture;

[0092] 3) press-filtering the solid-liquid mixture, washing the filter cake to neutrality, and drying to obtain a precursor of nickel-cobalt-lithium-manganese-oxide cathode material;

[0093] 4) Mixing the nickel-c...

Embodiment 1

[0177] Prepare 2.0mol / L nickel-cobalt-manganese sulfate mixed solution (molar ratio Ni:Co:Mn=50:20:30), 2.5mol / L NaOH solution, 3mol / L ammonia water, 10g / L PEG1000 dispersant Aqueous solution, the above-mentioned several solutions are passed into the reaction kettle under nitrogen protection atmosphere in a co-current manner, the stirring speed is 250rpm, the reaction temperature is kept at 60°C, and the reaction pH value is 12.0. After the reaction is completed, it is aged for 12 hours, and then press-filtered, washed, dried at 110° C., and sieved to obtain a small-particle 50 / 20 / 30 nickel-cobalt lithium manganate cathode material precursor. SEM results such as figure 1 As shown, the particle structure of the precursor is loose, and there are many gaps on the particle surface.

[0178] test result D. 50 5.7 μm, D max is 15.1μm, and the specific surface area is 11.9m 2 / g, bulk density AD is 0.90g / cm 3 , the tap density TD is 1.70g / cm 3 .

[0179] Gained nickel-cobalt l...

Embodiment 2

[0183]Prepare 1.5mol / L nickel-cobalt-manganese nitrate mixed solution (molar ratio Ni:Co:Mn=65:15:20), 6mol / L NaOH solution, 4mol / L ammonia water, 15g / L polyvinyl alcohol Dispersant aqueous solution, 0.2mol / L Y 2 (SO 4 ) 3 Solution, the above-mentioned several solutions are passed into the reactor in a parallel flow mode, control [n(Ni)+n(Co)+n(Mn)]: n(Y)=0.001, keep the reaction temperature at 50°C, The pH value is 12.5, the stirring speed is 200rpm, it is precipitated under the protective atmosphere of argon, aged for 16h, then washed, filtered, dried at 120°C, sintered at 500°C for 2h, and sieved to obtain large particles 65 / 15 / 20 Type nickel cobalt lithium manganese oxide cathode material precursor; SEM results are as follows image 3 As shown, the particle structure of the precursor is relatively loose, and there are gaps on the particle surface.

[0184] Test the D of the precursor 50 18.6 μm, D max is 45.3μm, and the specific surface area is 43.0m 2 / g, bulk dens...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a high energy density nickel-cobalt lithium manganate positive electrode material and a preparation method thereof. The molecular formula of the high energy density type nickel cobalt lithium manganate cathode material is LiNi x co y mn 1‑x‑y m z o 2‑δ R δ , where, 0<x<1, 0<y<0.4, 0<x+y≤1, 0≤z≤0.1, 0≤δ≤0.01, M is Al, Ti, Zr, B, Sr, Y, Ba , one or more of Mg, Nb, Co, W, Mo, Ta, Si, La, Er elements, R is one or more of F, Si, Cl elements. The nickel-cobalt-lithium-manganese-oxide cathode material of the present invention has a single-crystal or single-like morphology, high energy density, and excellent cycle performance and safety performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high energy density nickel-cobalt lithium manganate positive electrode material and a preparation method thereof. Background technique [0002] The energy density of lithium-ion batteries is closely related to the cathode material. Lithium nickel cobalt manganese oxide cathode material (NCM ternary material) better combines the advantages of lithium nickelate, lithium cobaltate, and lithium manganese oxide and makes up for their respective shortcomings. It has high specific capacity, good safety, and excellent cycle performance. , the cost is low, and it has been widely used in high-energy density and high-power batteries such as electric vehicles and energy storage. [0003] With the continuous development of lithium-ion battery technology, the market's requirements for the energy density of lithium-ion batteries continue to increase. Improving the energy densi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 王余李珊珊宋顺林刘亚飞陈彦彬李建忠
Owner 当升科技(常州)新材料有限公司
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