Preparation method of graphene modified high-nickel-series anode material

A graphene modification, cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as outstanding safety problems, decreased cycle performance and rate performance, serious gas production in cells, etc., and achieve high electronic conductivity. The effect of improving the rate, improving the rate performance, and improving the processing performance

Inactive Publication Date: 2018-09-14
宁夏汉尧石墨烯储能材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the main problems still exist in the application of high-nickel materials in power batteries include: first, the lithium-ion diffusion coefficient and electronic conductivity of high-nickel materials are low, which makes the rate performance of the materials not very ideal; second, the surface of high-nickel materials is due to residual alkali High temperature leads to serious gas production in the cells prepared from it, serious safety problems, high temperature storage and cycle performance need to be improved
[0007] 1. The graphene silica ball-coated ternary material prepared by mechanical b

Method used

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  • Preparation method of graphene modified high-nickel-series anode material

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Embodiment 1

[0038] A method for preparing a graphene-modified high-nickel series positive electrode material, comprising the following steps:

[0039] 1) The median particle size (D 50 )=10μm battery-grade nickel-cobalt-manganese hydroxide high-nickel precursor (the molar content of nickel is 80%) and lithium hydroxide according to the molar ratio of lithium ions and total metal ions (Li:Metal) is 1.05:1 at high speed Mix evenly, take 3kg of the mixed material and put it into a refractory saggar, under an oxygen atmosphere, the oxygen purity is controlled at 99.5% (V / V), and calcined in a roller kiln at 700°C for 25 hours to obtain a high-nickel primary The roasted material is then mechanically pulverized and classified at a frequency of 22 Hz to obtain the primary pulverized material of nickel oxide, cobalt, manganese and lithium;

[0040] 2) Add 1g of polyvinylpyrrolidone (PVP) to 1100g of ethanol and stir evenly to form solution I, then add 100g of polyvinylidene fluoride (PVDF) into so...

Embodiment 2

[0044] A method for preparing a graphene-modified high-nickel series positive electrode material, comprising the following steps:

[0045] 1) will D 50 =15μm battery-grade nickel-cobalt-manganese hydroxide high-nickel precursor (the molar content of nickel is 85%) and lithium carbonate are mixed at a high speed according to the Li:Metal molar ratio of 1.03:1, and the mixed material is packed in 3kg Put it into a refractory sagger, when the oxygen purity is controlled at 99.5%, calcined in a roller kiln at 800°C for 22 hours to obtain a high-nickel primary roasted material, and then mechanically pulverize and classify at a frequency of 18Hz to obtain a nickel-cobalt-manganese-lithium primary crushed material ;

[0046] 2) Add 1g of PVP to 1100g of ethanol and stir evenly to form solution I, then add 100g of PVDF to solution I and disperse evenly to form solution II, and finally add 80g of D 50 Graphene with a diameter of 5 μm is added to the solution II to disperse evenly to ...

Embodiment 3

[0050] A method for preparing a graphene-modified high-nickel series positive electrode material, comprising the following steps:

[0051] 1) will D 50 =10 μm battery-grade nickel-cobalt-manganese hydroxide high-nickel precursor (the molar content of nickel is 80%) and lithium hydroxide are uniformly mixed at a high speed according to the Li:Metal molar ratio of 1.05:1, and the mixed material takes 3kg Put it into a refractory sagger, and when the oxygen purity is controlled at 99.5%, calcinate in a roller kiln at 700°C for 25 hours to obtain a high-nickel primary roasted material, and then mechanically pulverize and classify at a frequency of 20Hz to obtain primary pulverization of nickel oxide, cobalt, manganese, and lithium material;

[0052] 2) First add 1g of polyethylene glycol octylphenyl ether into 1100g of deionized water and stir to form solution I, then add 75g of polyvinyl alcohol (PVA) to solution I to disperse evenly to form solution II, and finally add 70g of D...

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Abstract

The invention discloses a preparation method of a graphene modified high-nickel-series anode material. The preparation method of the graphene modified high-nickel-series anode material comprises the following steps: 1) uniformly mixing a high-nickel precursor with lithium carbonate or lithium hydroxide according to a certain molar ratio, and calcining and pulverizing the mixture in a roller kiln at an oxygen atmosphere to obtain a high-nickel primary pulverized material; 2) adding a dispersing agent, an adhesive and graphene in a solvent, and uniformly stirring and dispersing to form grapheneconductive slurry with a certain solid content, wherein the graphene conductive slurry is uniform emulsion in a dispersing state, and sedimentation and layering do not exist; 3) stirring the grapheneconductive slurry and the high-nickel primary pulverized material for a certain time according to a certain ratio, standing, filtering and drying; and 4) calcining and pulverizing the dried material in the roller kiln at a mixed gas atmosphere to obtain the final graphene modified high-nickel product. The graphene modified high-nickel anode material produced by the method has the characteristics of uniform wrapping, excellent rate capability and high-temperature cycle performance and stable process, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion secondary battery electrode materials, and in particular relates to a preparation method of a graphene-modified high-nickel series cathode material. Background technique [0002] With the increasing demand for power lithium batteries in the field of new energy, the development route of power battery cathode materials is also becoming clear: Lithium iron phosphate is limited by the theoretical energy density, and the market is limited to the bus market with slowing growth rate, and the passenger car market full of potential In the automotive market, materials represented by ternary layered nickel-cobalt-manganese-lithium oxide NCM811 and nickel-cobalt-aluminum-lithium oxide NCA are referred to as high-nickel cathode materials, and ternary layered nickel-cobalt-manganese-lithium oxide NCM333, NCM523, NCM622, etc. The material referred to as the ternary material is expected to become the abs...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/58
CPCH01M4/1397H01M4/58Y02E60/10
Inventor 靳佳周大桥李来强张宁
Owner 宁夏汉尧石墨烯储能材料科技有限公司
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