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A kind of preparation method of the lithium-ion battery of conductive polymer coating positive electrode

A conductive polymer, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation methods, poor performance, and difficulty in industrialization, and achieve a simple manufacturing process and high-rate charge and discharge. The effect of improved performance and long cycle life

Inactive Publication Date: 2011-12-14
WUHU HUAXINNUO ELECTROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some people in China have added polyaniline to prepare lithium iron phosphate (such as patent CN200810030514.6), but its preparation method is relatively complicated, the performance is poor, the cost is high, and it is difficult to industrialize

Method used

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  • A kind of preparation method of the lithium-ion battery of conductive polymer coating positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Lithium iron phosphate 77.5%, conductive agent acetylene black 4.5%, positive electrode binder polyvinylidene fluoride 7.5%, aniline or polyaniline 10.5%, mixed grinding, drying, and then adding solvent N-methylpyrrolidone 100% for stirring, Prepare positive electrode slurry. The slurry was coated on both sides of the aluminum foil, dried at 110° C., and rolled to obtain a positive electrode sheet. 93% of graphite, 3.5% of sodium carboxymethylcellulose, 3.5% of negative electrode binder LA132, and 80% of deionized water are used to make negative electrode slurry, and the negative electrode slurry is evenly coated on both sides of copper foil. After drying at 110°C, it was rolled to obtain a negative electrode sheet. Separate the above-mentioned positive electrode sheet and negative electrode sheet with a PP composite film, inject electrolyte, and the electrolyte is LiPF 6 -Dimethyl carbonate, propylene carbonate, its mass ratio is 1: 1, obtain battery after sealing, b...

Embodiment 2

[0022] Lithium vanadate 70%, conductive agent acetylene black 8%, positive electrode binder polytetrafluoroethylene 6.5%, pyrrole or polypyrrole 15.5%, mixed and ground, dried, then added, and then added solvent dimethylamide 120% to carry out Stir to make positive electrode slurry. The slurry was coated on both sides of the aluminum foil, dried at 110° C., and rolled to obtain a positive electrode sheet. Graphite 88%, sodium carboxymethyl cellulose 5.5%, negative electrode binder SBR 6.5%, deionized water 100%, make negative electrode slurry, and negative electrode slurry is evenly coated on both sides of copper foil. After drying at 110°C, it was rolled to obtain a negative electrode sheet. Separate the above-mentioned positive electrode sheet and negative electrode sheet with a PP composite film, inject electrolyte, and the electrolyte is LiPF 6-Dimethyl carbonate, propylene carbonate, its mass ratio is 1: 1, obtain battery after sealing, battery first discharge specific ...

Embodiment 3

[0024] Lithium cobaltate 73.5%, conductive agent acetylene black 6.5%, positive electrode binder polytetrafluoroethylene 6.5%, thiophene or polythiophene 14.5%, mixed and ground, dried, then added, and then added solvent dimethylamide 135% Stir to make positive electrode slurry. The slurry was coated on both sides of the aluminum foil, dried at 110°C, and rolled to obtain a positive electrode sheet. Graphite 86%, sodium carboxymethyl cellulose 6.5%, negative electrode binder SBR 7.5%, deionized water 110%, make negative electrode slurry, and negative electrode slurry is evenly coated on both sides of copper foil. After drying at 110°C, it was rolled to obtain a negative electrode sheet. Separate the above-mentioned positive electrode sheet and negative electrode sheet with a PP composite film, inject electrolyte, and the electrolyte is LiPF 6 -Dimethyl carbonate, propylene carbonate, its mass ratio is 1: 1, obtain battery after sealing, battery first discharge specific capac...

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Abstract

The invention discloses a preparation method of a lithium-ion battery with a conductive polymer coated positive electrode. The positive electrode sheet is a positive electrode slurry made of a positive electrode material, a conductive agent, a positive electrode binder, a conductive polymer or a conductive polymer monomer, and a solvent. The negative electrode sheet is composed of negative electrode material, thickener, negative electrode binder, and solvent mixed into negative electrode slurry and negative electrode current collector. The specific capacity of the battery is increased by 10-20% by adding a conductive polymer or a conductive polymer monomer to the slurry for coating. The invention effectively improves the performance of the prepared positive electrode material, and because the method is simple, the product cost is reduced, the process is simplified, and the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries and manufacturing techniques thereof, in particular to a lithium-ion battery with a positive electrode coated with a conductive polymer and a manufacturing technique thereof. Background technique [0002] At present, lithium-ion batteries are a new generation of green high-energy batteries with excellent performance, and have become one of the focuses of high-tech development. It stands out among many batteries with its high voltage, high capacity, low consumption, no memory effect, no pollution, small size, low internal resistance, low self-discharge, and many cycles. The application fields of lithium-ion batteries continue to expand, and their applications have penetrated into many civilian and military fields including telephones, notebook computers, video cameras, and digital cameras. In addition, domestic and foreign countries are also competing to develop large-capacity lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/62H01M4/1391H01M4/1397H01M4/1393
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 袁希梅甘跃褚道葆
Owner WUHU HUAXINNUO ELECTROCHEM TECH
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