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Application of alkaline porous membrane in lithium-sulfur rechargeable battery

A lithium-sulfur secondary battery, porous membrane technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems affecting the cost and service life of lithium-sulfur batteries, high cost, difficult practical application, etc. Selective permeability, low cost, and controllable effects

Active Publication Date: 2016-01-27
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

However, the high cost of such membranes and the decomposition of the catalytic electrolyte will greatly affect the cost and service life of lithium-sulfur batteries, making it difficult to obtain practical applications.

Method used

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  • Application of alkaline porous membrane in lithium-sulfur rechargeable battery
  • Application of alkaline porous membrane in lithium-sulfur rechargeable battery
  • Application of alkaline porous membrane in lithium-sulfur rechargeable battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 2g of chloromethyl polysulfone (the degree of chloromethylation is 135mmol / g) is dissolved in 8g of DMAC, stirred for 5 hours, and the polymer solution formed is spread on the surface of a glass plate, and scraped into a thickness of 250um under normal temperature and pressure. liquid film. After 10 seconds, place the glass plate together with the liquid film in a constant temperature and humidity chamber at 50°C with a humidity of 80%, and take it out after 5 minutes to form a porous diaphragm.

[0038] The prepared porous diaphragm was soaked in deionized water for 24 hours, and then immersed in a solution of pyridine:water=1:3 (volume ratio) for 12 hours. Afterwards, the porous membrane was washed with deionized water, and immersed in 3mol / L sulfuric acid aqueous solution for 24 hours to obtain a porous composite membrane. The grafted pyridine group accounted for 20wt.% of the total mass of the porous composite membrane, and the cross section of the membrane with su...

Embodiment 2

[0044] 1g of chloromethyl polysulfone (the degree of chloromethylation is 135mmol / g) is blended with 1g of ordinary polysulfone, dissolved in 8g of DMAC, stirred for 24 hours, and the resulting polymer solution is spread on the surface of a glass plate and kept at room temperature. Press down and scrape into a liquid film with a thickness of 250um. After 10 seconds, place the glass plate together with the liquid film in a constant temperature and humidity chamber at 50°C with a humidity of 80%, and take it out after 5 minutes to form a porous diaphragm.

[0045] The prepared porous diaphragm was soaked in deionized water for 24 hours, and then immersed in a solution of pyridine:water=1:9 (volume ratio) for 24 hours. Afterwards, the porous membrane was washed with deionized water, and immersed in 3 mol / L sulfuric acid aqueous solution for 24 hours. The grafted pyridine group accounts for 20wt.% of the total mass of the porous composite membrane.

[0046] The prepared porous s...

Embodiment 3

[0048] 1g of bromomethylated polysulfone (the degree of bromomethylation is 100mmol / g) was stirred for 15 hours, and the formed polymer solution was spread on the surface of a glass plate, and then quickly immersed in 5L of water to solidify to form a porous diaphragm.

[0049] The prepared porous diaphragm was soaked in deionized water for 24 hours, and then immersed in a solution of imidazole:water=1:3 (volume ratio) for 24 hours. Afterwards, the porous membrane is washed with deionized water and immersed in 3 mol / L sulfuric acid aqueous solution for 24 hours to obtain an alkaline porous membrane containing imidazole groups. The grafted imidazole groups accounted for 15wt.% of the total mass of the porous composite membrane.

[0050] Utilize the prepared porous membrane to assemble a lithium-sulfur secondary battery, wherein the catalytic layer is activated carbon felt, the bipolar plate is a graphite plate, and the effective area of ​​the membrane is 9 cm -2 , the current ...

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Abstract

The invention relates to an application of an alkaline porous membrane in a lithium-sulfur rechargeable battery. The alkaline porous membrane is prepared by the steps as follows: polyaromatic hydrocarbon resin containing a chloromethyl group or a bromomethyl group is taken as matrix, or the matrix is blended with other resin; and finally a basic group is grafted on the chloromethyl group or the bromomethyl group of the matrix, wherein the content of the matrix in the blended resin is 5wt%-100wt%. An alkaline perforated film is applied to the lithium-sulfur rechargeable battery; the membrane with relatively good mechanical performance is prepared from relatively little resin; closed pores in the membrane are fully filled with electrolyte; lithium ions are transferred through pore walls and the electrolyte; the lithium ion conductivity and the ion permselectivity of the membrane can be improved; and the selective penetration action on ions is achieved by adjusting pore structures and pore distribution of the membrane and the content of the basic group.

Description

technical field [0001] The invention relates to the application of an alkaline porous membrane in a lithium-sulfur secondary battery. Background technique [0002] Among the reported secondary battery systems, the theoretical specific energy of lithium-sulfur batteries is 2600Wh / kg, and the actual specific energy has exceeded 350Wh / kg. It is considered to be the closest commercial high specific energy secondary battery after lithium-ion batteries. system. In addition, the positive electrode active material (elemental sulfur) of lithium-sulfur batteries is cheap, widely sourced, and environmentally friendly, making it one of the most potential candidates for the next-generation energy storage system. In July 2010, SionPower of the United States used lithium-sulfur batteries as the power source for American unmanned aircraft. The drone was charged by solar cells during the day and discharged at night to provide power. It created a world record of continuous flight for 14 days...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/414H01M50/417H01M50/489H01M50/491H01M50/497
CPCY02E60/10
Inventor 张洪章张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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