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Carbon-coated nickel-manganese binary cobalt-free positive electrode material, preparation method thereof and lithium ion battery

A positive electrode material and carbon coating technology, applied in the field of lithium ion battery positive electrode material preparation, can solve the problems of poor uniformity, easy to fall off nickel-manganese binary cobalt-free positive electrode material electrochemical performance, poor stability of coating material, etc.

Active Publication Date: 2021-11-19
SVOLT ENERGY TECHNOLOGY CO LTD
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a carbon-coated nickel-manganese binary cobalt-free positive electrode material, its preparation method and lithium ion battery, to solve the uniformity of the surface coating material of the nickel-manganese binary cobalt-free positive electrode material in the prior art. Poor stability, poor stability of coating materials and easy to fall off, and poor electrochemical performance of carbon-coated nickel-manganese binary cobalt-free cathode materials

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  • Carbon-coated nickel-manganese binary cobalt-free positive electrode material, preparation method thereof and lithium ion battery
  • Carbon-coated nickel-manganese binary cobalt-free positive electrode material, preparation method thereof and lithium ion battery
  • Carbon-coated nickel-manganese binary cobalt-free positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0023] As described in the background technology, the existing carbon-coated nickel-manganese binary cobalt-free positive electrode material has poor uniformity, poor stability and easy to fall off, and the carbon-coated nickel-manganese binary cobalt-free positive electrode material The problem of poor chemical performance. In order to solve the above-mentioned technical problems, the application provides a method for preparing a carbon-coated binary positive electrode material. The preparation method of a carbon-coated nickel-manganese binary cobalt-free positive electrode material includes: replacing the matrix, graphene and solvent with ions For solvothermal reaction, the ion exchange matrix adopts the general formula MO n and / or M(OH) n , to obtain a solution containing the hydroxide / graphene composite, the K of the hydroxide sp is (1×10 -40 )~(1×10 -11 ), wherein, M is selected from Group IIA, Group IIIA, Group IVA, Group IIIB, Group IVB, Group VIB, Group VIIB or Gro...

Embodiment 1

[0055] A method for preparing a carbon-coated nickel-manganese binary cobalt-free positive electrode material comprises:

[0056] (1) Weigh graphene (made by the preparation method of graphene above) and disperse graphene in pure water. Mg(OH) 2 Mix with prepared graphene solution and stir at 300rpm / min stirring speed. During the above mixing process, Mg(OH) 2 , The weight ratio of graphene to water is 100:1:500.

[0057] (2) Add the above mixture into the reaction kettle, put the reaction kettle into an oven for solvothermal reaction, set the temperature of the solvothermal reaction to 200°C, and the reaction pressure to about 0.8MPa. solution of the compound / graphene composite.

[0058] (3) Mix the nickel-manganese binary precursor and lithium hydroxide evenly (the molar ratio of Li:(Ni+Mn) is 1.04:1), and put it into an oxygen atmosphere furnace (oxygen content ≥ 98%) for calcination , the heating rate was set at 2°C / min, kept at 750°C for 10h, then cooled with the fur...

Embodiment 2

[0064] The difference with embodiment 1 is: the hydroxide that adopts is Zr(OH) 2 , and Zr(OH) in step (1) 2 1. The weight ratio of graphene to water is 100:1:1000; the temperature of the solvothermal reaction in step (2) is 220°C, and the solvothermal time is 12h; in the step (5), stand still for 6h for ion exchange.

[0065] The obtained carbon-coated nickel-manganese binary cobalt-free cathode material (LiNi 0.75 mn 0.25 o 2 The amount of carbon coating in @C) is 1 wt%, and the thickness of the carbon coating layer is 4 nm. The electrochemical performance test results are shown in Table 1.

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Abstract

The invention provides a carbon-coated nickel-manganese binary cobalt-free positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the steps of enabling an ion replacement matrix, graphene and a solvent to be subjected to a solvothermal reaction, wherein the ion replacement matrix adopts a general formula MOn or M (OH) n, a solution containing the hydroxide / graphene composite material is obtained, the Ksp of hydroxide is (1 * 10 <-40 >)-(1 * 10 <-11 >), M is selected from the IIA group, the IIIA group, the IVA group, the IIIB group, the IVB group, the VIB group, the VIIB group or the VIII group, and n is 2-4; and carrying out ion exchange on the nickel-manganese binary cobalt-free positive electrode material and the solution containing the hydroxide / graphene composite material to obtain the carbon-coated nickel-manganese binary cobalt-free positive electrode material. By adopting the preparation method, a compact and stable carbon coating layer can be formed on the surface of the nickel-manganese binary cobalt-free positive electrode material.

Description

Technical field [0001] The present invention relates to the technical field of preparing lithium-ion battery cathode materials. Specifically, it relates to a carbon-coated nickel-manganese binary cobalt-free cathode material, its preparation method and lithium-ion battery. Background technique [0002] In recent years, among numerous energy storage devices, lithium-ion batteries have become the most popular energy source due to their advantages of high energy density, high voltage, and long cycle life. Among them, high-nickel layered cathode materials (LiNi x Co y M 1-x-y O 2 , x>0.5, M=Mn, Al) is considered one of the competitive ternary cathode materials due to its high discharge capacity (200~220mAh / g), high energy density (>800Wh / Kg) and low cost. However, there are still the following problems that need to be solved: (1) Li + / Ni 2+ The existence of mixing phenomenon will cause structural instability of the cathode material, increase in surface side reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B32/05C01B32/184C01B32/19C01B32/198H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/50C01B32/05C01B32/184C01B32/19C01B32/198H01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028C01P2004/03C01P2004/04C01P2002/72Y02E60/10
Inventor 任海朋崔军燕陈婷婷李嘉俊杨红新李子郯江卫军王涛
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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