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An application of a molecular sieve composite porous membrane in a lithium-sulfur battery

A technology of lithium-sulfur batteries and porous membranes, applied in the field of composite membranes for lithium-sulfur batteries, to achieve good thermal conductivity, inhibit the formation of dendrites, and reduce the effects of loss

Inactive Publication Date: 2018-01-05
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

[0010] The purpose of the present invention is to provide an application of an inorganic molecular sieve composite porous membrane in a lithium-sulfur battery in view of the current lithium-sulfur battery polysulfide shuttle problem

Method used

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  • An application of a molecular sieve composite porous membrane in a lithium-sulfur battery
  • An application of a molecular sieve composite porous membrane in a lithium-sulfur battery
  • An application of a molecular sieve composite porous membrane in a lithium-sulfur battery

Examples

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Embodiment 1

[0038] 7.5 grams of polyetherimide was dissolved in 30 mL of NMP and 10 mL of THF, stirred for 48 hours, and the resulting polymer solution was spread on a glass plate with a thickness of 100 μm, and then quickly immersed in 5 L of water to solidify to form a porous diaphragm.

[0039] Soak the prepared porous membrane in isopropanol for 2 hours to replace the water therein.

[0040]An isopropanol solution of ZSM-35 molecular sieve with a concentration of 80wt.% was prepared, and 20wt.% of Nafion resin was added therein, and sprayed on the surface of the porous membrane. A composite porous membrane (A) was obtained.

[0041] The prepared composite film was used to assemble a lithium-sulfur battery for testing. The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 20 μm, and the positive electrode is prepared by the following method: 25wt.% Super P carbon, 65wt.% elemental sulfur, 10wt.% polyvinylidene fluoride blended in N-methylpyrrolidon...

Embodiment 2

[0047] Same as Example 1, the organic polymer resin is replaced by polysulfone, and other conditions remain unchanged.

Embodiment 3

[0049] Same as Example 1, the organic polymer resin is replaced by polybenzimidazole, the solvent is replaced by NMP, and other conditions remain unchanged.

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Abstract

An application of a molecular sieve composite porous membrane in a lithium-sulfur battery is disclosed. The molecular sieve composite porous membrane is a composite porous membrane formed by adoptinga porous membrane prepared from one or more than two types of organic polymer resin as a matrix, and by compositing inorganic molecular sieve layers on the two side surfaces of the matrix. The molecular sieve composite porous membrane has high electrolyte absorbing capability and storage capability in the lithium-sulfur battery, and facilitates lithium ion transfer. The pore diameter of molecularsieve layers of the composite membrane can be controlled to be a size between a polysulfide size and a lithium ion size, and therefore the shuttle effect of polysulfide is effectively inhibited underthe premise of not influencing lithium ion conductivity, loss of active compounds is reduced, and the battery efficiency and stability are improved. In addition, the molecular sieve layers of the composite membrane have good thermal conductance, can inhibit generation of negative electrode lithium sheet dendritic crystals, and prevent battery short circuits because a separating membrane is piercedby the dendritic crystals in a battery using process.

Description

technical field [0001] The invention relates to a composite membrane for lithium-sulfur batteries, in particular to a composite porous membrane for lithium-sulfur batteries. Background technique [0002] With the improvement of people's living standards, automobiles have entered thousands of households as a common means of transportation. At present, the fuel used for vehicles mainly comes from non-renewable energy sources such as petroleum, which leads to environmental pollution and energy depletion. The environmental problems and energy crisis caused by the popularization of fuel vehicles have attracted more and more attention. As an environmentally friendly means of transportation, electric vehicles have attracted the attention of countries all over the world. Countries around the world are investing a lot of manpower and material resources in the development of electric vehicles. development. Since metallic lithium has the most negative potential, the lowest density, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/446H01M50/491
CPCY02E60/10
Inventor 李先锋张华民袁治章赵于月鲁文静
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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