Modification method for lithium-sulfur battery diaphragm

A lithium-sulfur battery and diaphragm technology, which is applied in the modification of lithium-sulfur battery diaphragm and interface modification of lithium-sulfur battery diaphragm, can solve the problems such as the inability to suppress the shuttle effect, and achieve easy industrialization, suppression of shuttle, and simple preparation process Effect

Inactive Publication Date: 2016-06-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defect that the current commercialized polyolefin separator cannot suppress the shuttle effect, the purpose of the present invention is to provide a method for modifying the lithium-sulfur battery

Method used

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  • Modification method for lithium-sulfur battery diaphragm

Examples

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Example Embodiment

[0027] Example 1: m-phenylenediamine and equimolar 1,4-cyclohexanediamine were dissolved in deionized water to prepare an aqueous medium with a polyamine concentration of 0.25 mol / L. Dissolve trimesoyl chloride and equimolar terephthaloyl chloride in n-hexane to prepare an oil phase medium with a polybasic acid chloride concentration of 0.25 mol / L. Dissolve 10 g of lithium polyacrylate in an aqueous medium. Immerse the polyvinylidene fluoride lithium-sulfur battery diaphragm in the aqueous medium for 1 minute, take out and remove the residual aqueous medium on the surface of the porous support film, and then contact the surface of the lithium-sulfur battery diaphragm with the oil-phase medium on one side for 5 seconds. Interfacial polymerization reaction to obtain the nascent modified lithium-sulfur battery separator. The nascent modified lithium-sulfur battery separator was taken out, dried, and heat-treated at 50°C for 60 minutes, and then immersed in deionized water at 30°C...

Example Embodiment

[0028] Example 2: Dissolving p-phenylenediamine in deionized water to prepare an aqueous medium with a polyamine concentration of 0.05 mol / L. Dissolve 5-oxoformyl chloride-isophthalic acid chloride in toluene to prepare an oil phase medium with a polybasic acid chloride concentration of 0.05 mol / L. Dissolve 0.5 g of polymethyl methacrylate in the oil phase medium. The polyimide lithium-sulfur battery separator was immersed in the aqueous medium for 80 minutes, and after removing and removing the residual aqueous medium on the surface of the porous support film, the surface of the lithium-sulfur battery separator was contacted with the oil-phase medium on one side for 90 seconds. Interfacial polymerization reaction to obtain the nascent modified lithium-sulfur battery separator. The nascent modified lithium-sulfur battery separator was taken out, dried and then heat-treated at 60°C for 30 minutes, and then immersed in deionized water at 25°C for 10 minutes to obtain a modified ...

Example Embodiment

[0029] Example 3: 1,3-cyclohexanedimethylamine was dissolved in deionized water to prepare an aqueous medium with a polyamine concentration of 0.18 mol / L. Dissolve isophthaloyl chloride in benzene to prepare an oil phase medium with a polyamine concentration of 0.18 mol / L. Dissolve 5g of graphene oxide in an aqueous medium. The polyethylene lithium-sulfur battery separator is immersed in the water-phase medium for 50 minutes, and the residual water-phase medium on the surface of the porous support film is taken out and removed, and then the surface of the lithium-sulfur battery separator is contacted with the oil-phase medium on one side for 30s to carry out interfacial polymerization. Through the reaction, a nascent modified lithium-sulfur battery separator is obtained. The nascent modified lithium-sulfur battery separator was taken out, dried and then heat-treated at 80°C for 10 minutes, and then immersed in deionized water at 40°C for 5 minutes to obtain a modified lithium-...

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Abstract

The invention discloses a modification method for a lithium-sulfur battery diaphragm. The method comprises the following steps: dissolving polyamine into water to prepare a water-phase medium; dissolving a polybasic acyl chloride into an organic solvent to prepare an oil-phase medium; dissolving an additive into the water-phase medium or the oil-phase medium; dipping the lithium-sulfur battery diaphragm into the water-phase medium, taking out the lithium-sulfur battery diaphragm, removing the residual water-phase medium on the surface of a porous support diaphragm, and making the surface of the lithium-sulfur battery diaphragm be in single-side contact with the oil-phase medium for an interfacial polymerization reaction to obtain a nascent diaphragm; and drying the diaphragm and then carrying out thermal treatment and rinsing to prepare the modified lithium-sulfur battery diaphragm. According to the method, the aperture of the diaphragm can be controlled to prepare the small-aperture lithium-sulfur battery diaphragm; and the small-aperture diaphragm is beneficial to suppression of polysulphide shuttling and improvement of the capacity retention ratio and the coulombic efficiency of a battery. The adopted additive has a lithium-conducting function; and a lot of lithium-conducting functional groups contained in the additive can provide a channel for shuttling of lithium ions, so that the problem of relatively low ionic conductivity caused by reduction of the aperture of the diaphragm is solved.

Description

technical field [0001] The invention relates to a method for modifying a diaphragm of a lithium-sulfur battery, belonging to the field of lithium-sulfur battery materials. In particular, it relates to a method for modifying the interface of a lithium-sulfur battery diaphragm. Background technique [0002] Energy crisis and environmental issues are two major challenges facing human society today. Adjusting energy structure and developing clean and renewable new energy have become the urgent needs of today's society. Among all electrochemical energy storage systems, lithium secondary batteries have been widely studied and applied due to their advantages of high voltage, high specific capacity, long cycle life, and no environmental pollution. [0003] Elemental sulfur has a very high theoretical capacity and energy density, and at the same time, sulfur has a series of advantages such as non-toxicity, environmental friendliness, wide source of raw materials, and low cost. Ther...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M50/403
CPCH01M50/403Y02E60/10
Inventor 刘久清吴秀锋李劼赖延清
Owner CENT SOUTH UNIV
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