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Lithium polyacrylate, preparation method and uses thereof, and lithium ion battery

A technology for lithium polyacrylate and lithium ion batteries, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of unfavorable lithium ion and electron transmission, high cost, and complicated operation process, and achieves the advantages of transmission and prevention of damage. , to avoid worsening effects

Inactive Publication Date: 2019-01-22
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the electrolyte needs to involve the synthesis of a variety of organic materials and the ratio of the materials is very strict. The operation process is relatively cumbersome, and it is not suitable for large-scale applications. Most of them are only used in small-scale research in the laboratory.
For the research on the structure of lithium-rich manganese-based materials, most of them need to use large-scale instruments and equipment, the cost is relatively high, and at the same time, researchers are required to have a high theoretical level, so it is not conducive to the promotion and application of materials on a large scale
In addition to the above research on the electrolyte and material structure, some researchers are also engaged in the research of adhesives. For example, Wu Feng's research group at Beijing Institute of Technology mixed PAN and PVDF in a certain proportion and used them in lithium-ion batteries. Although it has a certain inhibitory effect on the crushing and pulverization of materials, it does not involve the corrosion of electrolyte and other issues, and PAN and PVDF are non-conductive polymer materials, which are not conducive to excessive use in lithium-ion batteries. Transport of lithium ions and electrons

Method used

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  • Lithium polyacrylate, preparation method and uses thereof, and lithium ion battery
  • Lithium polyacrylate, preparation method and uses thereof, and lithium ion battery
  • Lithium polyacrylate, preparation method and uses thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The present embodiment provides a kind of lithium polyacrylate, and its preparation method is as follows:

[0053] Take a polyacrylic acid solution with a molecular weight of 250,000 and a mass fraction of 30%, and dilute it to a polyacrylic acid solution with a mass fraction of 20% with deionized water;

[0054] Use lithium hydroxide to adjust the diluted polyacrylic acid solution to a pH of 7, specifically: put lithium hydroxide into a polyacrylic acid solution with a mass fraction of 20%, ultrasonically, until the lithium hydroxide is completely dissolved, test the pH of the solution When it was 7, lithium polyacrylate was obtained, and the obtained lithium polyacrylate was sealed and sealed for subsequent use.

[0055] This embodiment also provides a lithium-ion battery, which includes an electrode material and a binder, wherein the electrode material includes a lithium-rich manganese-based positive electrode material, specifically Li 1.2 Ni 0.13 co 0.13 mn 0.54...

Embodiment 2

[0057] The present embodiment provides a kind of lithium polyacrylate, and its preparation method is as follows:

[0058] Take a polyacrylic acid solution with a molecular weight of 250,000 and a mass fraction of 30%, and dilute it to a polyacrylic acid solution with a mass fraction of 20% with deionized water;

[0059] Use lithium hydroxide to adjust the diluted polyacrylic acid solution to a pH of 5, specifically: put lithium hydroxide into a polyacrylic acid solution with a mass fraction of 20%, ultrasonically, until the lithium hydroxide is completely dissolved, test the pH of the solution When it was 5, lithium polyacrylate was obtained, and the obtained lithium polyacrylate was sealed and sealed for subsequent use.

[0060] This embodiment also provides a lithium-ion battery, which includes an electrode material and a binder, wherein the electrode material includes a lithium-rich manganese-based positive electrode material, specifically Li 1.2 Ni 0.13 co 0.13 mn 0.54...

Embodiment 3

[0062] The present embodiment provides a kind of lithium polyacrylate, and its preparation method is as follows:

[0063] Take a polyacrylic acid solution with a molecular weight of 250,000 and a mass fraction of 30%, and dilute it to a polyacrylic acid solution with a mass fraction of 20% with deionized water;

[0064] Use lithium hydroxide to adjust the diluted polyacrylic acid solution to a pH of 6, specifically: put lithium hydroxide into a polyacrylic acid solution with a mass fraction of 20%, ultrasonically, until the lithium hydroxide is completely dissolved, test the pH of the solution When it was 6, lithium polyacrylate was obtained, and the obtained lithium polyacrylate was sealed and sealed for subsequent use.

[0065] This embodiment also provides a lithium-ion battery, which includes an electrode material and a binder, wherein the electrode material includes a lithium-rich manganese-based positive electrode material, specifically Li 1.2 Ni 0.13 co 0.13 mn 0.54...

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Abstract

The invention relates to a lithium polyacrylate, a preparation method and uses thereof, and a lithium ion battery. The preparation method comprises: taking polyacrylic acid having a molecular weight of 200000-600000, and carrying out a mixing reaction on the polyacrylic acid and lithium hydroxide to obtain the lithium polyacrylate. According to the invention, the lithium polyacrylate used as the lithium-rich manganese-based lithium ion battery binder, the preparation method and the uses thereof are provided, and the lithium polyacrylate preparation method is simple, is suitable for industrialproduction, and has outstanding advantages in the improvement of the performances of lithium-rich manganese-based lithium ion batteries.

Description

technical field [0001] The invention relates to a lithium battery processing and manufacturing technology, in particular to lithium polyacrylate, its preparation method and application, and a lithium ion battery using lithium polyacrylate. Background technique [0002] In lithium-ion batteries, graphite has been widely used as a traditional negative electrode material, and some negative electrode materials with high energy density have been extensively studied, but the positive electrode materials that match the negative electrode materials are limited by the energy density. At present, many researchers are focusing on the positive electrode materials of lithium-ion batteries. Lithium-rich manganese-based materials (xLi 2 MnO 3 ·(1-x)LiMO 2 ) has attracted attention due to its high specific capacity, high energy density, and environmental friendliness, however, Li-rich Mn-based materials have limited their wide application due to the phenomenon of voltage drop. The voltag...

Claims

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Application Information

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IPC IPC(8): C08F20/06C08F8/44H01M4/36H01M4/62H01M10/0525
CPCC08F8/44H01M4/366H01M4/622H01M4/624H01M4/628H01M10/0525C08F20/06Y02E60/10
Inventor 周园马路祥董生德
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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