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Composite layered positive electrode material, and preparation method and purpose thereof

A cathode material and composite layer technology, applied in the field of new energy materials, can solve the problems of inability to effectively adjust the thickness, uneven material coating, etc., and achieve easy mass production, controllable coating thickness, and uniform coating effect. Effect

Active Publication Date: 2017-09-29
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, while the above research reveals that doping coating modification can improve the electrical properties and cycle performance of materials, it also reflects the shortcomings of uneven material coating and the inability to effectively adjust the thickness.

Method used

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  • Composite layered positive electrode material, and preparation method and purpose thereof
  • Composite layered positive electrode material, and preparation method and purpose thereof
  • Composite layered positive electrode material, and preparation method and purpose thereof

Examples

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Embodiment 1

[0056] A method for preparing a composite layered positive electrode material, which can realize controllable adjustment of the thickness of the coating layer on the surface of the layered positive electrode material.

[0057] Specific steps are as follows:

[0058] Weigh 13g of aluminum isopropoxide and dissolve it in 1L of ethanol. After it is completely dissolved and dispersed, weigh 1000g of LiNi 0.8 co 0.1 mn 0.1 o 2 Add the positive electrode material, then add 5g of auxiliary polyvinylpyrrolidone (PVP-K30), and stir in a stirring tank for 0.5h, remove the solvent by spray drying, and heat-treat the dried material at 500°C for 3h to obtain Al 2 o 3 Coated LiNi 0.8 co 0.1 mn 0.1 o 2 For the positive electrode material, that is, the composite layered positive electrode material, the thickness of the coating layer is 5nm±1nm.

[0059] figure 1 The TEM image of the composite layered positive electrode material prepared in this example shows that the surface of the ...

Embodiment 2

[0061] A method for preparing a composite layered positive electrode material, which can realize controllable adjustment of the thickness of the coating layer on the surface of the layered positive electrode material.

[0062] Specific steps are as follows:

[0063] Weigh 13g of aluminum isopropoxide and dissolve it in 1L of ethanol. After it is completely dissolved and dispersed, weigh 1000g of LiNi 0.8 co 0.1 mn 0.1 o 2 Add the positive electrode material, then add 5g of auxiliary polyvinylpyrrolidone (PVP-K30), and stir in a stirring tank for 3h, remove the solvent by spray drying, and heat-treat the dried material at 500°C for 3h to obtain Al 2 o 3 Coated LiNi 0.8 co 0.1 mn 0.1 o 2 The thickness of the coating layer of the positive electrode material, that is, the composite layered positive electrode material is 19nm±1nm.

[0064] figure 2 The TEM image of the composite layered positive electrode material prepared in this example shows that the surface of the ma...

Embodiment 3

[0066] A method for preparing a composite layered positive electrode material, which can realize controllable adjustment of the thickness of the coating layer on the surface of the layered positive electrode material.

[0067] Specific steps are as follows:

[0068] Weigh 13g of aluminum isopropoxide and dissolve it in 1L of ethanol. After it is completely dissolved and dispersed, weigh 1000g of LiNi 0.8 co 0.1 mn 0.1 o 2 Add the positive electrode material, then add 10g of auxiliary polyvinylpyrrolidone (PVP-K30), and stir in a stirring tank for 3h, remove the solvent by spray drying, and heat-treat the dried material at 500°C for 3h to obtain Al 2 o 3 Coated LiNi 0.8 co 0.1 mn 0.1 o 2 The thickness of the coating layer of the positive electrode material, that is, the composite layered positive electrode material is 10nm±1nm.

[0069] image 3 The TEM image of the composite layered cathode material prepared in this example shows that the surface of the material is c...

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Abstract

The invention discloses a composite layered positive electrode material, and a preparation method and a purpose thereof. The composite layered positive electrode material comprises a layered positive electrode material and a coating layer with the thickness being 5nm to 20nm coating the surface of the layered positive electrode material. The method comprises the following steps of (1) dissolving a soluble coating source into a solvent; then, sequentially adding the materials into a positive electrode material and polyvinylpyrrolidone-K30; performing stirring and solid-liquid separation; (2) optionally performing heat treatment to obtain the composite layered positive electrode material, wherein the mass ratio of the polyvinylpyrrolidone-K30 to the layered positive electrode material is 0.005 to 0.01; the solid-liquid separation mode is any one kind of mode or the combination of at least two kinds of modes of press filtering separation, flash separation or spray separation. The method provided by the invention can realize the controllable regulation on the coating layer thickness on the surface of the layered positive electrode material; the coating effect is uniform, so that the layered positive electrode material is better modified; the electrochemical performance and the circulation stability of the materials can be improved.

Description

technical field [0001] The invention relates to the field of new energy materials, and relates to a composite layered positive electrode material, its preparation method and application, in particular to a composite layered positive electrode material, a preparation method and application of a controllable and adjustable coating layer thickness. Background technique [0002] Layered cathode materials (such as LiNi x m 1-x o 2 , 0.6≤x≤1.0, M is one or more of Co, Mn and Al) has high energy density, long cycle life and good safety performance, has attracted much attention, but its cycle stability and rate performance have yet to be improve. In order to better develop LiNi x m 1-x o 2 Anode materials, to meet the needs of power lithium-ion batteries, people have done a lot of research work, mainly focusing on the surface modification of materials, and improving the electrochemical performance and safety of materials by means of doping or coating . [0003] A large numbe...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/131
CPCH01M4/131H01M4/366H01M4/505H01M4/525Y02E60/10
Inventor 丁立勇杨成吴小珍杨顺毅黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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