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Lithium-rich material/conductive organic polymer composite positive material and electrode preparation method

A technology of composite cathode materials and lithium-rich cathode materials, which is applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc. and other problems, to achieve the effect of improving electron transfer rate, short diffusion path, and improving conductivity.

Active Publication Date: 2018-08-28
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The currently commonly used conductive agent acetylene black is easy to agglomerate during the homogenization process, and it is difficult to achieve uniform mixing with the lithium-rich cathode material, resulting in high contact resistance of the electrode, resulting in capacity loss

Method used

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  • Lithium-rich material/conductive organic polymer composite positive material and electrode preparation method
  • Lithium-rich material/conductive organic polymer composite positive material and electrode preparation method
  • Lithium-rich material/conductive organic polymer composite positive material and electrode preparation method

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Experimental program
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Effect test

Embodiment 1

[0043] (1) Preparation of lithium-rich cathode materials:

[0044] The lithium acetate of stoichiometric ratio, manganese acetate, cobalt acetate, nickel acetate are dissolved in the ethanol solution of 50%, obtain the metal ion concentration and be the mixed solution A of 2mol / L, oxalic acid is dissolved in the ethanol solution of 99.5%, obtain The concentration of oxalic acid is 2mol / L mixed solution B. Add the mixed solution A dropwise to the mixed solution B, stir at 60°C for 1 hour, transfer to a polytetrafluoroethylene hydrothermal kettle, then seal the reaction kettle and place it in an oven, and react at a constant temperature of 180°C for 12 hours. Dry at 80°C for 12h under vacuum, calcinate at 450°C for 6h in a muffle furnace, then calcinate at 500°C for 5h, 750°C for 2h, and 900°C for 12h in an air atmosphere in a tube furnace, then quench with liquid nitrogen to room temperature. Obtain nano / micro rod-like hierarchical structure lithium-rich layered oxide cathode ...

Embodiment 2

[0055] The preparation method of embodiment 2 is the same as embodiment 1, and the only difference is that lithium acetate of stoichiometric ratio, manganese acetate, cobalt acetate, nickel acetate are dissolved in the ethanol solution of 70% instead of being dissolved in the ethanol solution of 50%. The rate performance test results are as follows: figure 1 shown.

Embodiment 3

[0057] The preparation method of Example 3 is the same as that of Example 1, the only difference is that the above-mentioned lithium-rich positive electrode material and conductive cross-linked polymer are dissolved in chloroform at a mass ratio of 90:10 instead of being dissolved in chloroform at a mass ratio of 85:15. in chloroform. The rate performance test results are as follows: figure 1 As shown, compared with the sol-gel method, adopting the method of the present invention to synthesize the lithium-rich positive electrode material has higher rate performance; in the process of preparing the lithium-rich positive electrode material, 50% ethanol solution is used, and the lithium-rich positive electrode material and the conductive cross-linked polymer The in-situ coating ratio performance is the best with the mass ratio of 90:10.

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Abstract

The invention relates to a lithium-rich material / conductive organic polymer composite positive material and an electrode preparation method. A one-step oxalate coprecipitation- solvothermal method isadopted to obtain the lithium-rich positive material of a nano / micron rodlike hierarchical structure; an in-situ polymerization method is performed on a conductive organic polymer to coat the lithium-rich positive material, and the lithium-rich material / conductive organic polymer composite positive material is obtained. The prepared lithium-rich material / conductive organic polymer composite positive material can be used for preparing a positive electrode. According to the preparation method, by synthesizing the lithium-rich layered oxide positive material of the nano / micron rodlike hierarchical structure, the positive material has dual advantages of nano and micron structures, the diffusion path of lithium ions is short, the material structure has good stability, the positive material is coated with the conductive organic polymer, the electron transfer rate of the lithium-rich material is improved, the charge transfer resistance is reduced, the cycling stability is improved, and the rate capability of the material is greatly improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium-rich material / conductive organic polymer composite positive electrode material and a preparation method of the electrode. Background technique [0002] As a new form of energy storage, lithium-ion batteries alleviate people's dependence on fossil fuels and the increasingly severe environmental pressure. In recent years, layered lithium-rich manganese-based cathode materials xLi 2 MnO 3 ·(1-x)LiMO 2 (M = one or more transition elements such as Co, Ni, Mn) due to its high capacity, low cost and environmental friendliness, it can be used in the field of electric vehicles and large-scale energy storage grids, and is known as the most potential for development One of the anode materials for a new generation of lithium-ion batteries. [0003] Currently, most conducting polymers have either low energy density or low power density. For example, poly(p-pheny...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/60H01M4/1391H01M4/1399H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/1391H01M4/1399H01M4/366H01M4/505H01M4/525H01M4/602H01M10/0525Y02E60/10
Inventor 陈胜洲谢宇翔杨伟马婷婷邹汉波
Owner GUANGZHOU UNIVERSITY
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