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Polymer mould method for preparing diaphragm of fluorine-contained polymen lithium ion cell

A technology of lithium-ion batteries and polymers, applied in battery components, circuits, membrane technology, etc., can solve problems affecting liquid absorption and battery conductivity, and achieve high porosity, large pore size, and uniform pore size Effect

Inactive Publication Date: 2007-07-18
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore structure obtained by this method is asymmetric, and the pore size is nanoscale, which affects the liquid absorption of the electrolyte by the separator and thus affects the electrical conductivity of the battery.

Method used

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  • Polymer mould method for preparing diaphragm of fluorine-contained polymen lithium ion cell
  • Polymer mould method for preparing diaphragm of fluorine-contained polymen lithium ion cell
  • Polymer mould method for preparing diaphragm of fluorine-contained polymen lithium ion cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare 10wt% fluorine-containing copolymer PVDF-HFP (Aldrich, USA, Mw=4.5×10 5 , Mn=1.3×10 5 ), 10wt% PVP (K30, China Pharmaceutical Group Shanghai Chemical Reagent Company, imported repackaging) acetone solution, mechanically stirred in a constant temperature water bath at 50°C to obtain a viscous casting solution. Vacuum defoaming for several hours and removal of impurities. Squeegee-coat the casting solution onto a clean glass plate with a scraper gap of 140-500 μm, expose it to air for 30 seconds, and then dry it in vacuum at 50°C until the solvent evaporates completely. At room temperature, the film prepared above was cut into a rectangle, and soaked in absolute ethanol for 24 hours. After natural drying at room temperature, the extraction efficiency was calculated by gravimetric method. The resulting film was quenched in liquid nitrogen, and vacuum-plated with gold to observe the structure of the surface and cross-section by scanning electron microscopy. Afte...

Embodiment 2

[0034] Prepare 25wt% fluorine-containing copolymer PVDF-HFP (Aldrich, USA, Mw=4.5×10 5 , Mn=1.3×10 5 ), 25wt% PVP (K30, China Pharmaceutical Group Shanghai Chemical Reagent Company, imported repackaging) acetone solution, mechanically stirred in a constant temperature water bath at 50°C to obtain a viscous casting solution. Vacuum defoaming for several hours and removal of impurities. Squeegee-coat the casting solution onto a clean glass plate with a scraper gap of 140-500 μm, expose it to air for 30 seconds, and then dry it in vacuum at 50°C until the solvent evaporates completely. At room temperature, the film prepared above was cut into a rectangle, and soaked in absolute ethanol for 24 hours. After natural drying at room temperature in a glove box filled with argon, moisture 2 6 / EC-DMC (volume ratio: 1:1) for 2 hours, the membrane was taken out between two pieces of filter paper to gently remove excess electrolyte on the surface of the membrane, and the liquid absorption ...

Embodiment 3

[0036] Prepare 10wt% fluorine-containing copolymer poly(vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene) (Aldrich, USA, Mw=4.5×10 5 , Mn=1.3×10 5 ), 10wt% PVP (K30, China Pharmaceutical Group Shanghai Chemical Reagent Company, imported repackaging) acetone solution, mechanically stirred in a constant temperature water bath at 50°C to obtain a viscous casting solution. Vacuum defoaming for several hours and removal of impurities. Squeegee-coat the casting solution onto a clean glass plate with a scraper gap of 140-500 μm, expose it to air for 30 seconds, and then dry it in vacuum at 50°C until the solvent evaporates completely. At room temperature, the film prepared above was cut into rectangles, soaked in absolute ethanol for 24 hours, and dried naturally at room temperature. In a glove box filled with argon, the moisture content was 2 6 / EC-DMC (volume ratio: 1:1) for 2 hours, the membrane was taken out between two pieces of filter paper to gently remove excess e...

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Abstract

This invention discloses a polymer formwork method preparing F polymer lithium battery membrane. This invention adopts the low molecular weight as the polymer formwork, metafluoroethylene or its copolymer as the matrix of F polymer, make the thickness solution with different mixture ratio in different solutions under the temperature of 50deg.C--80deg.C; the molding fluid carries out sweep molding on the smooth glass plate, adopt solvent evaporation conversion process to make the polymer film; use extractant to extract polymer formwork under room temperature, then natural dry; activate in the electrolytic solution and get polymer electrolytic film. Using different preparation and extracting conditions to get different apertures and microporous membranes with different structures. This microporou membranes gained by this invention has the regular microporous structure, the porosity ratio is 50-70%, the average aperture is 0.5-3 mum, the imbibitions ration is 250-520%,and the conducting ratio is 10 to the power -3-10 to the power -2 S cm to the power -1 and can be used as the membrane of the secondary battery. This membrane can also be used as compart or supporting membrane.

Description

technical field [0001] The invention relates to a preparation method of a fluorine-containing polymer lithium-ion battery diaphragm, in particular to a polymer template method for preparing a fluorine-containing polymer lithium-ion battery diaphragm. Background technique [0002] With the development of energy, information, and materials, secondary lithium-ion battery technology and related materials have also developed rapidly. Compared with the currently used liquid lithium-ion batteries, polymer lithium-ion batteries have the characteristics of small size, light weight, long life, high safety performance and easy battery shape design, which can meet the further miniaturization and light weight of mobile phones and notebook computers. Quantify development requirements. In the secondary lithium-ion battery, the microporous polymer separator is an important part of the battery. It is placed between the positive and negative electrodes, which can make the two electrodes as c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14C08J5/22C08J5/18C08J9/00H01M2/16B01D67/00B01D69/00H01M50/403H01M50/411
CPCY02E60/10
Inventor 徐又一操建华朱宝库姜宁林沈立强
Owner ZHEJIANG UNIV
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