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Application of non-porous diaphragm in lithium sulfur secondary battery

A technology for lithium-sulfur secondary batteries and porous diaphragms, which can be used in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc. It can solve problems such as difficulty in meeting long-term use requirements, serious swelling, and expensive fluorine-containing membranes. The effect of maintaining ion transmission selectivity, low cost, and easy mass production

Inactive Publication Date: 2016-07-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 non-porous diaphragm in lithium sulfur secondary battery
  • Application of non-porous diaphragm in lithium sulfur secondary battery
  • Application of non-porous diaphragm in lithium sulfur secondary battery

Examples

Experimental program
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Embodiment 1

[0032] Dissolve 0.1 g of polyvinylidene fluoride in 10 g of DMAC, stir for 2 hours to form a uniform and transparent polymer solution, scrape it on a glass plate with a glass rod, and then quickly place the glass plate on a baking table at 70°C. After 3 hours, remove the completely volatilized polyvinylidene fluoride film on the glass plate, and place it in a vacuum drying oven at 70°C with a vacuum degree of 0.1 MPa.

[0033] figure 2 and image 3 The surface and cross-sectional scanning electron microscope pictures of the prepared membrane material are given, showing a non-porous structure. The prepared non-porous separation membrane and commercial separator 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 di...

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Abstract

The invention discloses application of a non-porous diaphragm in a lithium sulfur secondary battery. The non-porous diaphragm is prepared according to the step of taking polyvinylidene fluoride organic high-molecular resin as a raw material by a casting film formation method, and the thickness of the non-porous diaphragm is 5-10 micrometers. By such diaphragm, the separation of poly-sulfide ions and lithium ions can be effectively achieved, the ion transmittance selectivity of the diaphragm is maintained, and ion transfer and poly-sulfide ion blocking can be achieved in no need of dependence on an ion exchange group and a particular lattice structure. The diaphragm material is simple in preparation method and low in cost, and mass production can be easily realized, and the processing method and the selection range of the diaphragm material of the lithium sulfur secondary battery are expanded.

Description

technical field [0001] The invention relates to the application of a non-porous diaphragm 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 (Lithium sulfur battery) is low in cost and easy to process. It is considered to be the secondary battery closest to industrialization and the most promising to replace lithium ion battery. [0003] The battery separator is an important part of the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052H01M50/403H01M50/426
CPCY02E60/10
Inventor 张华民晏娜张洪章王美日曲超王倩
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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