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Preparation method of conductive polymer modified lithium ion battery positive pole piece

A technology of lithium-ion batteries and conductive polymers, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in large-scale production, cumbersome preparation process of lithium-ion battery composite electrode materials, etc., and achieve excellent rate performance and Cycling performance, reduction of interface side reactions, and reduction of production costs

Active Publication Date: 2017-12-22
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the lithium-ion battery composite electrode material is relatively cumbersome, and it is difficult to meet the requirements of large-scale production.
At present, there is no relevant report on the direct coating of PVK on the positive electrode material of lithium-ion battery or the research on the modification of the positive electrode sheet of lithium battery.

Method used

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  • Preparation method of conductive polymer modified lithium ion battery positive pole piece
  • Preparation method of conductive polymer modified lithium ion battery positive pole piece
  • Preparation method of conductive polymer modified lithium ion battery positive pole piece

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The preparation method of the conductive polymer modified lithium-ion battery cathode sheet of the present embodiment comprises the following steps:

[0041] 1) Pour 0.05g polyvinylcarbazole into a 5mL small beaker, add 2mL N-methylpyrrolidone, and stir at 500r / min until dissolved to obtain solution A;

[0042] 2) 2g LiFePO 4 The powder was slowly added to the solution A obtained in step 1), and then heated and stirred at 60°C for 4 hours, and mixed evenly to obtain the dispersion B;

[0043] 3) Centrifuge the dispersion B obtained in step 2) to remove N-methylpyrrolidone; then add distilled water to disperse, centrifuge, pour off the liquid, and repeat 2 times; then add ethanol to disperse, centrifuge, pour off the liquid, and repeat 2 more times times; during centrifugation, the speed of the centrifuge was 3000r / min; finally, it was dried at 110°C for 12 hours to obtain a conductive polymer-coated positive electrode material;

[0044] 4) Mix the conductive polymer-c...

Embodiment 2

[0046] The preparation method of the conductive polymer modified lithium-ion battery cathode sheet of the present embodiment comprises the following steps:

[0047] 1) Pour 0.025g polyvinylcarbazole into a 5mL small beaker, add 2mL N-methylpyrrolidone, stir at 300r / min until dissolved, and obtain solution A;

[0048] 2) 2g LiCoO 2 The powder was slowly added to the solution A obtained in step 1), and then heated and stirred at 70°C for 4 hours, and mixed evenly to obtain the dispersion B;

[0049] 3) Centrifuge the dispersion B obtained in step 2) to remove N-methylpyrrolidone; then add distilled water to disperse, centrifuge, pour off the liquid, and repeat 2 times; then add ethanol to disperse, centrifuge, pour off the liquid, and repeat 2 more times times; during centrifugation, the speed of the centrifuge was 3500r / min; finally, it was dried at 110°C for 10 hours to obtain a conductive polymer-coated positive electrode material;

[0050] 4) Mix the conductive polymer-coa...

Embodiment 3

[0052] The preparation method of the conductive polymer modified lithium-ion battery cathode sheet of the present embodiment comprises the following steps:

[0053] 1) Pour 0.075g polyvinylcarbazole into a 5mL small beaker, add 2mL N-methylpyrrolidone, stir at 700r / min until dissolved, and obtain solution A;

[0054] 2) 2g LiNiO 2 The powder is slowly added to the solution A obtained in step 1), and then heated and stirred at 70°C for 8 hours, and mixed evenly to obtain the dispersion B;

[0055] 3) Centrifuge the dispersion B obtained in step 2) to remove N-methylpyrrolidone; then add distilled water to disperse, centrifuge, pour off the liquid, and repeat 2 times; then add ethanol to disperse, centrifuge, pour off the liquid, and repeat 2 more times times; during centrifugation, the speed of the centrifuge was 4500r / min; finally, it was dried at 120°C for 10 hours to obtain a conductive polymer-coated positive electrode material;

[0056] 4) Mix the conductive polymer-coat...

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Abstract

Belonging to the technical field of lithium ion batteries, the invention relates to a preparation method of a conductive polymer modified lithium ion battery positive pole piece. The method includes: coating a lithium ion battery positive active material surface with polyvinyl carbazole, then coating a current collector with the polyvinyl carbazole coated positive active material so as to obtain the lithium ion battery positive pole piece. According to the preparation method provided by the invention, the surface of the positive active material is coated with polyvinyl carbazole, thus effectively reducing the interface side reaction between the positive active material and an electrolyte solution, also ensuring Li<+> good transfer efficiency, simultaneously enhancing the electrical conductivity of the positive material, and prolonging the service life of the positive active material. By coating the current collector with the polyvinyl carbazole coated positive active material, the positive pole piece with excellent electrical properties, especially rate performance and stability can be obtained. And polyvinyl carbazole itself has certain caking properties, and can strengthen the oneness of the positive pole piece.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a preparation method for conducting polymer-modified lithium-ion battery cathode sheets. Background technique [0002] As a new type of green energy, lithium-ion batteries have the advantages of high voltage, large specific energy, long cycle life, good safety performance, small self-discharge, fast charge and discharge, and high operating temperature range, making them widely used in portable electronic equipment, office automation, electric vehicles, etc. There are very broad application prospects in automobiles, medical equipment, defense industry and even household appliances. [0003] With the continuous development of society, improving the energy density of lithium-ion batteries has become a research hotspot. In recent years, great progress has been made in the direction of practical negative electrode materials and electrolytes, while the research on positi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/1397H01M4/364H01M4/5825H01M4/622H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 曹朝霞李艳蕾岳红云李向南乔芸杨书廷
Owner HENAN NORMAL UNIV
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