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Multi-hole diaphragm making method for lithium ion battery

A lithium-ion battery, porous diaphragm technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as insufficient safety and insufficient puncture resistance

Inactive Publication Date: 2008-08-13
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method, the microporous membranes currently produced industrially are basically HDPE single-layer isolation membranes, which have disadvantages such as insufficient safety and insufficient puncture resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Reagents and instruments

[0019] PVDF-HFP is produced by American Elf Aiocbem Company, the model is KY-NAR-2801);

[0020] Acetone (Yantai Sanhe Chemical Reagent Co., Ltd., analytically pure);

[0021] Tetrahydrofuran (THF Tianjin No. 3 Chemical Reagent Factory, analytically pure);

[0022] Ethanol (Shandong Haihua Group Tianhe Organic Chemical Company, analytically pure);

[0023] Deionized water;

[0024] Glycerin (Yantai Sanhe Chemical Reagent Co., Ltd., analytically pure).

[0025] The model of the scanning electron microscope is KYKY, and the magnification is 2000 times.

[0026] The battery charging and discharging equipment is the CT-2001A tester produced by Landian Electronics Co., Ltd.

[0027] 2. Preparation of PVDF-HFP porous film

[0028] Mix PVDF-HFP with solvent and non-solvent in a certain proportion, and stir at 40-75°C for 2-6 hours to obtain a clear and viscous sol, which can be scraped on a smooth glass plate or coated with aluminum foil on ...

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PUM

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Abstract

The present invention discloses a method for preparing a lithium ion battery used porous diaphragm, and the method of the invention adopts the following steps: mixing PVDF-HFP and dissolvent and nonsolvent according to the proportion, constant-temperature stirring for 2-6h in the temperature 50-80 DEG C to obtain the clear and viscous colloidal sol, afterwards coating and removing the coated film after drying, and last embedding into the baking oven with temperature 60-80 DEG C for furnace drying. The battery separator prepared by the method of the invention has high liquid absorption rate and good charging-and-discharging capability.

Description

technical field [0001] The invention relates to the technical field of a preparation method of a separator for a lithium ion battery. Background technique [0002] Polymer lithium-ion battery not only has the characteristics of high voltage, high specific energy, long cycle life and clean and pollution-free of liquid lithium-ion battery, but also has flexible shape design and thinner thickness because of its solid structure and flexible packaging. , better security and so on. Polymer lithium-ion batteries have been used in various new mobile phone products, and have become another hot spot in the research of chemical power sources in recent years. The key technology of polymer lithium ion battery is to prepare polymer electrolyte diaphragm. In 1993, Bellcore of the United States developed a porous polymer electrolyte with high ionic conductivity and good mechanical strength based on vinylidene fluoride and hexafluoropropylene copolymer (VDF-HFP). Relatively complicated, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14C08J5/22C08J5/18H01M50/403H01M50/491
CPCY02E60/10
Inventor 杨梅
Owner SHENZHEN SENIOR TECH MATERIAL
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