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Method for preparing membrane with excellent ion conductivity

A technology with excellent ionic conductivity, applied in electrical components, circuits, battery pack components, etc., can solve problems such as high resistance and unsuitable battery separators

Inactive Publication Date: 2008-09-17
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymethyl methacrylate is not suitable as a battery separator capable of handling high current because of its high electrical resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 20 g of particulate cellulose (Aldrich c64 13) were dissolved in 22 kg of a 5% LiCl / DMAC solution and heated to 130° C. for 1 hour. The solution was cooled and then mixed with 5% ethylcellulose in DMAC in a weight ratio of 60:40 cellulose / ethylcellulose, 5% polyethylene glycol and 0.6% of zinc chloride. Using a humidifier, 45 g of the solution were cast and gelled on a glass dish. A hygrometer next to the pan shows 20°C and 65% relative humidity. A viscous gel formed after 1 hour, which was then washed off to obtain a solvent- and salt-free gel. The gel was dried under vacuum to obtain a membrane with a thickness of 75 microns.

Embodiment 2

[0034] 20 g of powdered cellulose having a degree of polymerization of 1200 (International Filler Coporation) was dissolved in 2 kg of 3% LiCl / DMAC. Cellulose was crosslinked by reaction with NaOH and 1,6 diiodohexane. The resulting cellulose solution was mixed with 4% polyphenylene oxide in DMAC, 7% polyethylene glycol and 0.8% zinc chloride were added, and both solutions were heated to 70°C and then cooled. The solution was cast on a conveyor belt and allowed to gel on the conveyor belt. The gel is moved to a different area where it is rinsed and rinsed along another conveyor before being taken to a drying drum.

Embodiment 3

[0036] 409 microcrystalline cellulose (Mcc, Aldrich 31, 069-7) was placed in 2 kg of 5% LICI / DMAC solution and heated to 120° C. for 15 minutes. The cooled solution provided a clear solution of MCC. 5 g of ethylcellulose (EC) were dissolved in 100 ml of DMAC, respectively. The MCC and EC solutions were combined at a weight ratio of 60:40 (calculated by polymer weight), and 5% polyethylene glycol and 0.6% zinc chloride were added. 40 ml of this combined solution was placed on a glass dish, which was exposed to ambient moisture at 21° C. and a relative humidity of 55-60%, and a viscous gel was obtained in about 2 hours. The gel contains an MCC phase and an EC phase. The gel was then repeatedly washed with water until all DMAC and LICI were removed. The gel is then dried using extrusion drying to provide a thin film that can be used as a separator.

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PUM

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Abstract

The invention discloses a method for preparing a battery membrane with the excellent ion conductivity. The method of the invention comprises the following steps: cellulose with the degree of polymerization of 500 to 1600 is dissolved in a solvent to form a solution; alkyl cellulose is dissolved in the solvent to form a solution; the two solution are mixed into a solution which has the polymer with the weight concentration of 25 to 50 percent, then polyethylene glycol and zinc chloride solutions are added; a gel membrane containing the alkyl cellulose which is dispersed in the regenerated cellulose continuous phase is formed; and the gel membrane is dried to prepare the battery membrane. The battery membrane which is prepared by the invention can be resistant to the alkaline electrolyte and not be penetrated by zinc ions; furthermore, the battery membrane contains the polymer region with the hydrogen penetration rate.

Description

technical field [0001] The invention relates to the technical field of a preparation method of a diaphragm for a zinc ion battery. Background technique [0002] Existing batteries contain recombinant separators comprising porous melt-blown polymer fibers that include surfactants or lubricants that facilitate gas transport across the surface. US Patent No. 6,054,084 describes a separator for lead-acid batteries consisting of a polytetrafluoroethylene (PTFE) fibril matrix filled with granular silica and a non-evaporable lubricant as a gas transport agent. Zucker in US Patent No. 5,962,161 describes a recombinant separator for lead-acid batteries comprising melt-blown polypropylene with a surfactant making the polypropylene wettable, thereby enabling it to transmit oxygen. [0003] Polyethylene microporous membranes melt between 120 and 130°C, and their early closure characteristics make it easy to suppress the increase in temperature associated with micropore closure, but in ...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08L1/02C08L1/28C08K3/16H01M2/16C08L71/08C08L71/12C08L83/04C08L1/12H01M50/403H01M50/44H01M50/446
CPCY02E60/10
Inventor 杨梅
Owner SHENZHEN SENIOR TECH MATERIAL
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