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High-safety gel polymer film and preparation method thereof

A gel polymer, high-safety technology, applied in electrical components, circuits, battery pack components, etc., can solve the problems of contact between positive and negative electrodes of batteries, shrinkage of diaphragms, and burning of lithium batteries. Stable performance, low equipment energy consumption, safe and reliable charging and discharging effects

Inactive Publication Date: 2013-02-13
HUBEI WEWIN BATTERY TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, when the single-layer or multi-layer (PP / PE) film is porous, it is easy to cause perforation when the current is too large, and then cause the lithium battery to burn or explode; when the battery is abused at high temperature, the internal reaction of the battery is violent, and the temperature rises. It will also cause the diaphragm to shrink and break holes, and the positive and negative electrodes of the battery will come into contact, eventually causing the battery to burn

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] One: The specific process flow is:

[0022] (1) Preparation of polymer solution: Dissolve 3% PVDF / HFP in acetone, and control the stirring temperature at 38°C-42°C. After PVDF / HFP is completely dissolved and clarified, add 3% absolute ethanol and stir evenly; then add 3% boehmite, stir evenly, and the solution is prepared. The whole stirring process takes about 4-6 hours.

[0023] (2) Dip coating and drying: soak the single-layer or multi-layer diaphragm in the prepared solution, control the speed at 2m / min-4m / min, dry it under hot air at 70°C, and dip-coat it twice And drying, the coating thickness is controlled at 4-6μm;

[0024] The gel polymer diaphragm made by this method has been tested and the battery cycle is good. The battery cycle is 100 cycles, and the capacity retention rate is 97%. The battery has a good high-temperature impact. No abnormalities were found.

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Abstract

The invention relates to a high-safety gel polymer film and a manufacturing method thereof. The high-safety gel polymer film can be applied to high-temperature batteries or lithium-ion batteries with severer environment temperature application. According to the invention, a lithium-ion battery diaphragm extensively used at present is used as a base material of a polyolefin single-layer thin film or multi-layer thin film, a gel polymer solution is used as a diaphragm layer coating, and the gel polymer diaphragm is prepared through dip coating, drying and solvent removal. The gel polymer solution is prepared by uniformly mixing 2-4% of PVDF / HFP (Polyvinylidene Fluoride / hexafluoropropylene), 1-3% of ALOOH and 2-5% of absolute ethyl alcohol or isopropyl in 90-96% of acetone by weight. Compared with the prior art, the high-safety gel polymer film has the advantages of simple manufacturing technology, easy acquisition of materials, easy removal of a solvent, low equipment energy consumption and environment-friendly technological process.

Description

technical field [0001] The invention relates to a gel polymer film for lithium ion batteries and a preparation method thereof, which can be applied to high temperature batteries or lithium ion batteries with relatively harsh ambient temperature applications. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, long cycle life, no memory effect, etc., and are environmentally friendly and pollution-free. Therefore, they are widely used in digital products such as mobile phones, notebook computers, and MP3. At the same time, they are used in electric bicycles, electric vehicles, and national defense. Mobile power sources such as equipment have also begun to be applied. [0003] The battery separator is an important part of the lithium-ion battery. It is placed between the anode and cathode, preventing physical contact of the electrodes while ensuring free transport of ions and isolation of electron flow. The basic requirement o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C09D127/16C09D7/12
CPCY02E60/12Y02E60/10
Inventor 雷如清朱忠洲潘琴华
Owner HUBEI WEWIN BATTERY TECH
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