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Preparation method of coated polyetherimide membrane and application of coating polyetherimide membrane to lithium sulfur battery

A technology of polyetherimide and lithium-sulfur batteries, which is applied to battery components, circuits, electrical components, etc., can solve the problems of positive electrode active material loss, battery coulombic efficiency and cycle life reduction, and achieve electrochemical stability Effects of lifting, improved mechanical properties and thermal stability, and improved capacity retention and Coulombic efficiency

Inactive Publication Date: 2019-03-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shuttle effect not only causes serious loss of positive electrode active materials, but also reduces the Coulombic efficiency and cycle life of the battery.

Method used

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  • Preparation method of coated polyetherimide membrane and application of coating polyetherimide membrane to lithium sulfur battery
  • Preparation method of coated polyetherimide membrane and application of coating polyetherimide membrane to lithium sulfur battery
  • Preparation method of coated polyetherimide membrane and application of coating polyetherimide membrane to lithium sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 12.5g of PEI and 1.5g of polyvinylpyrrolidone in 36g of NMP, then place the obtained mixed casting solution in an oil bath, heat it at 75°C for 24h, then ultrasonically for 10min, and place it at 70°C Stand in the oven for defoaming for 12 hours to obtain a homogeneously cast mixed film solution; cast the obtained homogeneously mixed film cast solution on a glass plate, and then adjust the scraper parameters to obtain diaphragms with different film thicknesses; use a scraper to obtain different film thicknesses. The thick diaphragm is immersed in deionized water to separate phases to form pores, and then stand still, and the deionized water is constantly replaced during the period; after standing, the diaphragm is heated and dried in a vacuum drying oven, the heating and drying temperature is 60 ° C, and the drying time is 12 hours , to obtain a polyetherimide-based film, then molybdenum disulfide nanosheets, conductive carbon black and polyvinylidene fluoride t...

Embodiment 2

[0032]Dissolve 12.5g of PEI and 1.3g of carboxymethyl cellulose in 36.2g of NMP, then place the obtained mixed casting solution in an oil bath and heat it for 24h while stirring at 75°C, then sonicate for 10min, and place it at 70°C Stand in the oven for defoaming for 12 hours to obtain a homogeneously cast mixed film solution; cast the obtained homogeneously mixed film cast solution on a glass plate, and then adjust the scraper parameters to obtain diaphragms with different film thicknesses; use a scraper to obtain different film thicknesses. The thick diaphragm is immersed in deionized water to separate phases to form pores, and then stand still, and the deionized water is constantly replaced during the period; after standing, the diaphragm is heated and dried in a vacuum drying oven, the heating and drying temperature is 60 ° C, and the drying time is 12 hours , to obtain a polyetherimide-based film, then vanadium dioxide nanosheets, graphene and polyvinylidene fluoride are ...

Embodiment 3

[0034] Dissolve 12.5g of PEI and 1.4g of polyvinyl alcohol in 36.1g of NMP, then place the obtained mixed casting solution in an oil bath, heat it for 24h while stirring at 75°C, then sonicate it for 10min, and put it in an oven at 70°C Standing in the middle for degassing for 12 hours, the mixed film solution of homogeneous casting is obtained; the obtained homogeneous mixed casting solution is cast on a glass plate, and then the parameters of the scraper are adjusted to obtain diaphragms with different film thicknesses; diaphragms of different thicknesses are obtained with a scraper The diaphragm was immersed in deionized water for phase separation and pore formation, and then stood still, during which the deionized water was constantly replaced; after standing still, the diaphragm was heated and dried in a vacuum drying oven at a temperature of 60°C and a drying time of 12 hours. Polyetherimide-based film, and then tin dioxide nanosheets, carbon nanotubes and polyvinylidene ...

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Abstract

The invention relates to a preparation method of a coated polyetherimide membrane and an application of the coated polyetherimide membrane to a lithium sulfur battery. By adopting a non-solvent induced phase separation method (the NIPS method), polyetherimide (PEI), polyvinylpyrrolidone (PVP) and N,N-methylpyrrolidone (NMP) are mixed based on a certain ratio, heated and dissolved to obtain a mixedcasting membrane solution; the mixed casting membrane solution is cast into a membrane; the obtained membrane is immersed into a mixed coagulation bath, the NMP in the membrane is removed, and vacuumdrying is performed to obtain a base membrane. Then, two-dimensional nano metal oxide or sulfide coating slurry is prepared, the base membrane is coated with a layer of the relatively thin slurry, and drying is performed to obtain the coated polyetherimide membrane. The method is simple in process and easy in parameter control; the physical property and the chemical property of the prepared coated polyetherimide membrane are greatly improved compared with those of a common commercial membrane; and the rate performance and the cycling performance of the lithium sulfur battery provided with themembrane are also improved.

Description

technical field [0001] The invention belongs to a preparation method of a novel diaphragm material, in particular to a novel diaphragm for suppressing the "shuttle effect" of a lithium-sulfur battery and a preparation and application method thereof. Background technique [0002] As we all know, a battery is composed of positive and negative electrodes, an electrolyte, and a separator between the positive and negative electrodes. The separator is an essential part of the battery, and its physical properties such as porosity, strength, and thermal stability have a serious impact on the safety of the battery and the battery assembly process. In the battery, although the separator that absorbs a large amount of electrolyte does not participate in the electrochemical reaction, by controlling the kinetic process of the battery, the microporous structure inside the separator and the arrangement structure and chemical properties of the polymer chain segments are important for the sa...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/414H01M50/431H01M50/451
CPCH01M50/403H01M50/411Y02E60/10
Inventor 刘久清祝方方崔金强
Owner CENT SOUTH UNIV
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