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Lithium battery nickel-cobalt lithium manganate ternary anode material and preparation method thereof

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of battery electrodes, positive electrodes, electrical components, etc., can solve the problem that ternary positive electrode materials cannot guarantee high specific capacity and good cycle performance at the same time, so as to improve the first discharge Capacity and cycle performance, increased lithium ion transport channels, uniform particle size effects

Active Publication Date: 2017-10-27
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a lithium battery nickel cobalt lithium manganate ternary positive electrode material and a preparation method thereof, aiming to solve the problem that the lithium battery ternary positive electrode material prepared by the existing method cannot simultaneously ensure high specific capacity and comparative Technical issues of good cycle performance

Method used

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  • Lithium battery nickel-cobalt lithium manganate ternary anode material and preparation method thereof
  • Lithium battery nickel-cobalt lithium manganate ternary anode material and preparation method thereof
  • Lithium battery nickel-cobalt lithium manganate ternary anode material and preparation method thereof

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preparation example Construction

[0030] Such as figure 1 As shown, the preparation method of the lithium battery nickel cobalt manganese oxide lithium ternary positive electrode material provided herein comprises the following steps:

[0031] Step S101 , preparing two groups of nickel-cobalt-lithium-manganese oxide materials with different nickel contents.

[0032] In the process of preparing nickel-cobalt-manganese lithium manganate material, the ternary precursor containing nickel-cobalt-manganese and the lithium source are uniformly mixed according to the molar ratio of 1.00≤Li:(Ni+Co+Mn)≤1.10, that is, the lithium in the lithium source The molar ratio of the sum of nickel, cobalt and manganese elements in the nickel-cobalt-manganese ternary precursor is between 1.00 and 1.10. In this step, the lithium is lithium carbonate, lithium hydroxide and lithium oxalate. At least one of them; then sintering at a high temperature in the temperature range of 700-950° C. for 5-20 hours, and making the oxygen content ...

Embodiment 1

[0041] Select Ni:Co:Mn=50:20:30 and average particle size D 50 =10 μm nickel-cobalt-manganese ternary precursor, weigh an appropriate amount of lithium hydroxide according to the molar ratio Li:(Ni+Co+Mn)=1.03. The nickel-cobalt-manganese precursor and lithium hydroxide were mixed in a high-speed mixer for 3 hours, then placed in a box furnace at 900°C for sintering for 15 hours, and then the samples were taken out, pulverized and sieved to obtain nickel-cobalt lithium manganese oxide material A1. According to the above steps, the nickel-cobalt-manganese precursor with Ni:Co:Mn=55:25:20 and average particle size D50=10 μm was sintered at 900°C, crushed and sieved to obtain nickel-cobalt-lithium manganese oxide material A2. Then, the above two groups of nickel-cobalt-lithium-manganese-oxide materials were mixed for 1.5 hours according to the mass ratio A1:A2=1:1.

[0042] According to the molar ratio Al:Zr=1:2, the nanoscale Al 2 o 3 The powder was put into the zirconium sol...

Embodiment 2

[0046] Select Ni:Co:Mn=60:20:20 and average particle size D 50 =15 μm nickel-cobalt-manganese ternary precursor, weigh an appropriate amount of lithium hydroxide according to the molar ratio Li:(Ni+Co+Mn)=1.07. The nickel-cobalt-manganese precursor and lithium hydroxide were mixed in a high-speed mixer for 3 hours, then placed in a box furnace at 850°C for sintering for 13 hours, and then the samples were taken out, pulverized and sieved to obtain nickel-cobalt lithium manganese oxide material A1. According to the above steps, Ni:Co:Mn=55:25:20 and average particle size D 50 =5 μm nickel-cobalt-manganese precursor was sintered at 900°C, crushed and sieved to obtain nickel-cobalt-lithium manganese oxide material A2. Then, the above two nickel-cobalt-lithium-manganese oxide products were mixed for 1.5 hours according to the mass ratio A1:A2=4:1.

[0047] According to the molar ratio Al:Ce=3:1, the nanoscale Al 2 o 3 Put it into the zirconium sol and stir for 1 hour, put it i...

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Abstract

The invention is applicable to the field of lithium battery anode materials and provides a lithium battery nickel-cobalt lithium manganate ternary anode material and a preparation method thereof. The preparation method comprises the following steps: preparing two groups of nickel-cobalt lithium manganate materials of different nickel contents; preparing a coating material from an aluminum salt and sol with a coating element; uniformly mixing the two groups of the prepared nickel-cobalt lithium manganate materials according to a certain mass ratio, further mixing with the coating material, and sintering in a tank type furnace, thereby obtaining the nickel-cobalt lithium manganate ternary anode material. As the nickel-cobalt lithium manganate materials of different nickel contents are mixed, the specific capacity of the material is increased; and as the surface of the material is coated by the coating material with at least one element of Zr, Mg, Ti, Ce, La, Nb, Ba, V, Ni, Co, Mn and Al, the circulation property of the material can be improved. The material is simple in preparation process and is capable of ensuring excellent and stable product properties.

Description

technical field [0001] The invention belongs to the technical field of lithium battery positive electrode materials, and in particular relates to a lithium battery nickel-cobalt lithium manganate ternary positive electrode material and a preparation method thereof. Background technique [0002] At present, secondary lithium batteries have been widely used in the fields of 3C digital and electric vehicles. However, for battery packs composed of secondary lithium batteries with an energy density of 150-200Wh / Kg, the energy released by them still cannot meet the needs of people's growing The development of lithium batteries with higher specific energy has become the focus of attention. Compared with lithium cobalt oxide, nickel-cobalt lithium manganese oxide ternary cathode material has the advantages of higher theoretical specific capacity, long life, high safety and low pollution. Therefore, nickel-cobalt lithium manganese oxide ternary cathode material has become the most O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 徐世国惠科石周晓燕胡明慧
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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