High-performance lithium ion battery composite membrane and preparation method thereof

A composite diaphragm, high-performance technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of composite membrane lyophobicity not involved, achieve good binding, improve lyophilic performance, and improve performance Effect

Active Publication Date: 2018-10-19
江苏北星新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of the separators obtained by these methods has been improved, the liquid repellency of the composite membranes has not yet been involved.

Method used

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  • High-performance lithium ion battery composite membrane and preparation method thereof
  • High-performance lithium ion battery composite membrane and preparation method thereof
  • High-performance lithium ion battery composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) The fully cleaned and dried PE diaphragm is corona treated at a power of 500W for 120s, and then the corona-treated PE microporous membrane is placed in a dichloromethane solution with a mass concentration of 5.0wt% methyl methacrylate In the process, the grafting reaction was carried out at 50°C for 150 minutes, then the PE film was taken out, washed with deionized water, and fully dried in a vacuum oven;

[0023] 2) Immerse the cleaned and fully dried PTFE diaphragm in 0.05 wt% N-[3-(p-perfluorononenyloxybenzamido)propyl]-N,N,N-tri In the methyl ammonium iodide solution, take it out after 120min, wash it with deionized water, and dry it in vacuum;

[0024] 3) Modified PTFE microporous membrane and PE microporous membrane composite

[0025] The PE diaphragm modified in step (1) and the PTFE diaphragm modified in step (2) are respectively laminated by PE / PTFE / PE in a laminated manner. The composite temperature is 80°C and the pressure is 0.1MPa. The speed is 0.1m / m...

Embodiment 2

[0027] 1) The fully cleaned and dried PE diaphragm was corona-treated at a power of 1800W for 10s, and then the corona-treated PE microporous membrane was placed in a dichloromethane solution with a mass concentration of 1.0wt% methyl methacrylate In the process, the grafting reaction was carried out at 110°C for 45 minutes, and then the PE film was taken out, washed with deionized water, and fully dried in a vacuum oven;

[0028] 2) Immerse the cleaned and fully dried PTFE diaphragm into N-[3-(p-perfluorononenyloxybenzamido)propyl]-N,N,N-tri In the methyl ammonium iodide solution, take it out after 10min, wash it with deionized water, and dry it in vacuum;

[0029] 3) Modified PTFE microporous membrane and PE microporous membrane composite

[0030] The PE diaphragm modified in step (1) and the PTFE diaphragm modified in step (2) are laminated by PE / PTFE / PE respectively, the composite temperature is 25°C, the pressure is 20MPa, and the speed of the composite roller is It is ...

Embodiment 3

[0032] 1) The fully cleaned and dried PE diaphragm was corona-treated at a power of 1000W for 80s, and then the corona-treated PE microporous membrane was placed in a dichloromethane solution with a mass concentration of 2.0wt% methyl methacrylate In the process, the grafting reaction was carried out at 85°C for 100 minutes, then the PE film was taken out, washed with deionized water, and fully dried in a vacuum oven;

[0033] 2) Immerse the cleaned and fully dried PTFE diaphragm into N-[3-(p-perfluorononenyloxybenzamido)propyl]-N,N,N-tri In the methyl ammonium iodide solution, take it out after 30min, wash it with deionized water, and dry it in vacuum;

[0034] 3) Modified PTFE microporous membrane and PE microporous membrane composite

[0035] The PE diaphragm modified in step (1) and the PTFE diaphragm modified in step (2) are laminated by PE / PTFE / PE respectively, the composite temperature is 65°C, and the pressure is 5.0MPa. The rotational speed is 1.0 m / min. After roll...

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Abstract

The invention relates to a high-performance lithium ion battery composite membrane and a preparation method of the high-performance lithium ion battery composite membrane, and belongs to the technicalfield of the lithium ion battery composite membranes. The surfaces of a PTFE (Polytetrafluoroethylene) microporous membrane and a PE (Polyethylene) microporous membrane are respectively modified, a hydrophilic group on the surface of the PTFE microporous membrane and a polar group on the surface of the PE microporous membrane are bonded through a hydrogen bond and a chemical bond in the compounding process, the bonding performance of the two microporous membranes is excellent due to the cohesive action of the polymer, the problem of excessively high internal resistance of the membrane causedby the gap interval in the hydrophobic compound is solved; in addition, the polar group is on the surface of the composite membrane, the lyophilic performance is improved, and the use performance of the composite membrane is greatly improved; according to the prepared composite membrane in the sandwich structure, the PTFE layer improves the temperature resistance performance of the battery membrane, the pore closing property of the PE layer is excellent, and the sandwich composite membrane greatly improves the safety of the lithium battery.

Description

technical field [0001] The invention relates to a lithium-ion battery composite diaphragm and a preparation method thereof, in particular to a composite diaphragm with a sandwich structure composed of a modified polytetrafluoroethylene (PTFE) microporous membrane and a modified polyethylene (PE) microporous membrane. Separator and method for its preparation. Background technique [0002] In the lithium battery structure, the separator is one of the key inner components. During the charge-discharge cycle of the lithium-ion battery, the battery separator can prevent the positive and negative electrodes of the battery from contacting and prevent the battery from short-circuiting. At the same time, the porous structure can ensure the rapid passage of lithium ions. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/411H01M50/457H01M50/489H01M50/491
CPCH01M10/0525H01M50/403H01M50/449Y02E60/10
Inventor 郭红霞赵耀李钒秦振平赵营营崔素萍
Owner 江苏北星新材料科技有限公司
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