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Application of an ion exchange membrane in lithium-sulfur secondary battery

A lithium-sulfur secondary battery and ion-exchange membrane technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as difficulty in meeting long-term use requirements, expensive fluorine-containing membranes, and severe swelling. Achieve the effect of maintaining ion transmission selectivity, easy mass production, and low cost

Active Publication Date: 2019-09-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
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AI Technical Summary

Problems solved by technology

Because the fluorine-containing membrane is expensive and swells severely in the electrolyte, it is difficult to meet the long-term use requirements, so most of the research work on lithium-sulfur battery membranes is currently focused on the coating modification of PP / PE separators.

Method used

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  • Application of an ion exchange membrane in lithium-sulfur secondary battery
  • Application of an ion exchange membrane in lithium-sulfur secondary battery
  • Application of an ion exchange membrane in lithium-sulfur secondary battery

Examples

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Embodiment 1

[0035] Put 1.6 g of polyvinylidene fluoride and 0.17 g of sulfonated graphene in 10 g of DMAC, stir for 2 hours to form a uniform polymer solution, scrape and coat the glass plate with a scraper, and then quickly place the glass plate on a baking table at 70 ° C superior. After 3 hours, the completely volatilized film on the glass plate was removed, and placed in a vacuum drying oven at 70° C., with a vacuum degree of 0.1 MPa.

[0036] figure 2 The surface and cross-sectional scanning electron microscope pictures of the prepared membrane materials are given. The prepared ion-exchange membrane and commercial diaphragm SK (polyethylene monolayer film) are used to form a composite membrane, and a lithium-sulfur battery is assembled. The commercial carbon-sulfur composite is used as the positive electrode, and the metal lithium sheet is used as the negative electrode. 1M trifluoromethylsulfonyl The 1,3-dioxolane and ethylene glycol dimethyl ether (1:1 volume ratio) solution of ...

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Abstract

The invention relates to an application of an ion exchange membrane in a lithium-sulfur secondary battery. The ion exchange membrane is made of polyvinylidene fluoride organic polymer resin and sulfonated graphene as raw materials, and is prepared by a film-forming method by scraping coating . The mass ratio of polyvinylidene fluoride organic polymer resin to sulfonated graphene (1-15): 1, the pore diameter range is 0.1-10nm, and the porosity is 30-60%. This type of membrane can effectively realize the selective conduction of polysulfide ions and lithium ions through the ion-exchange groups on sulfonated graphene, maintain the ion permeation selectivity of the membrane, and realize the transfer of ions without relying on a special lattice structure. And the barrier of polysulfide ion. The preparation method of this kind of membrane material is simple, the cost is low, and it is easy to realize mass production, which expands the processing method and selection range of the lithium-sulfur secondary battery membrane material.

Description

technical field [0001] The invention relates to an application of an ion exchange membrane in a lithium-sulfur secondary battery, in particular to the application of this type of membrane in a lithium-sulfur secondary battery. Background technique [0002] Lithium-sulfur secondary battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has high energy conversion efficiency, flexible system design, low cost, high specific energy (>400Wh / kg), safety and environmental protection, and maintenance With the advantages of low cost, it can be widely used in electric vehicles, unmanned aircraft, emergency power systems, backup power stations, etc. Lithium sulfur secondary battery (Lithiumsulfur battery) is low in cost and easy to process, and is considered to be the secondary battery closest to industrialization and most promising to replace lithium ion battery. [0003] The battery separator is an important part of the lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/431H01M50/446H01M50/491
CPCH01M10/052H01M50/446H01M50/403Y02E60/10
Inventor 张洪章张华民晏娜李先锋曲超王美日
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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