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Gel electrolyte based on porous matrix and resisting electrolyte leakage and preparation method thereof

A gel electrolyte and porous matrix technology, applied in the field of chemistry, can solve the problem that the electrolyte retention effect is not very effective, and achieve the effects of increasing the number of lithium ion migration, high conductivity, and suppressing leakage

Active Publication Date: 2014-12-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this single porous structure is not very effective in maintaining the electrolyte.

Method used

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  • Gel electrolyte based on porous matrix and resisting electrolyte leakage and preparation method thereof
  • Gel electrolyte based on porous matrix and resisting electrolyte leakage and preparation method thereof
  • Gel electrolyte based on porous matrix and resisting electrolyte leakage and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 4g polyvinylidene fluoride-chlorotrifluoroethylene, 100mg CuCl, 300mg 2'2-bipyridine and 10g sodium styrene sulfonate in a flask in a vacuum glove box, take out from the glove box after sealing; Add 150ml of N-methylpyrrolidone distilled under reduced pressure to the above solid mixture and stir at 90°C for 12 hours. After the reaction is complete, dilute the resulting mixed solution with acetone and use Al2 o 3 The chromatographic column is separated, and finally the chromatographic product is precipitated by methanol, and vacuum-dried to obtain polyvinylidene fluoride-trifluorochloroethylene grafted with polystyrene sodium sulfonate.

[0026] The prepared polyvinylidene fluoride-trifluorochloroethylene grafted with sodium polystyrene sulfonate was dissolved in dimethylformamide to prepare a solution with a concentration of 5wt%, and added relative to the sodium polystyrene sulfonate grafted The mass of polyvinylidene fluoride-chlorotrifluoroethylene is 70% polye...

Embodiment 2

[0030] Weigh 2g of polyvinylidene fluoride, 100mg of CuBr, 200mg of 2'2-bipyridine and 20g of sodium styrene sulfonate in a vacuum glove box, seal it and take it out from the glove box, and distill the dimethylformamide in advance Add 100ml of sulfoxide to the above solid mixture and stir at 120°C for 24 hours. After the reaction is complete, dilute the resulting mixture with acetone and use Al 2 o 3 The chromatographic column is separated, and finally the chromatographic product is precipitated by methanol, and vacuum-dried to obtain polyvinylidene fluoride grafted with polystyrene sodium sulfonate.

[0031] Dissolve the prepared polyvinylidene fluoride grafted with sodium polystyrene sulfonate in dimethylacetamide to prepare a solution with a mass fraction of 25%, and add 60% glycerol relative to the mass fraction of the grafted polymer as a pore-forming agent, pour the mixed solution into a film, put it in a vacuum drying oven at 80°C for 24 hours to remove dimethylacetami...

Embodiment 3

[0035] Weigh 2.5g of PVC, 200mg of FeCl in a vacuum glove box 2 1.5g of pentamethyldiethylenetriamine and 20g of sodium styrene sulfonate were sealed in the flask and taken out from the glove box, then 150ml of dimethyl sulfoxide distilled under reduced pressure was added to the above solid mixture and stirred at 100°C 9 hours, after the completion of the reaction, the resulting mixed solution was diluted with acetone and used Al 2 o 3 Chromatographic separation, and finally using methanol to precipitate the chromatographic product and vacuum drying to obtain polyvinyl chloride grafted with sodium polystyrene sulfonate.

[0036] The prepared polyvinyl chloride grafted with sodium polystyrene sulfonate is dissolved in N-methylpyrrolidone to prepare a solution with a concentration of 5wt%, and the amount of polyvinyl chloride grafted with respect to sodium polystyrene sulfonate is 80% ethanol is used as a pore-forming agent, the mixed solution is poured into a film, placed in ...

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Abstract

The invention provides a gel electrolyte for a lithium ion battery based on a single ion conduction porous matrix and a preparation method thereof. The preparation method comprises the following steps: preparing a polymer having the characteristic of single ion conduction; further preparing a porous matrix with a certain pore structure from the prepared polymer by using a phase inversion method; and dipping the porous matrix in an electrolyte containing organogelators for in situ gelation. The organogelators form a network structure through self-assembly in the porous matrix in a non-covalent bond manner and constrain the electrolyte in micropores, so electrolyte leakage is effectively inhibited. The transmission behavior of a lithium ion in the gel electrolyte is similar to that in an electrolyte, so the prepared gel electrolyte has the characteristics of a low electrolyte leakage rate, high lithium ion conductivity and high mechanical strength. The single ion conduction polymer matrix guarantees that a prepared electrolyte material has a great transference number of lithium ions.

Description

technical field [0001] The invention belongs to the chemical field and relates to polymer electrolyte technology for lithium ion batteries, in particular to a gel electrolyte material for lithium ion batteries with low electrolyte leakage, high electrical conductivity and high ion transfer number and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LiBs) are widely used in mobile phones, digital cameras, portable computers and other fields due to their high energy density, high working voltage, long cycle life, low pollution, and no memory effect. Lithium-ion battery electrolyte materials are responsible for conducting ions, blocking electrons, and isolating positive and negative active materials, which have a direct impact on the discharge efficiency, cycle life, and safety of lithium-ion batteries. An ideal electrolyte material should not only have good lithium ion conductivity, but also need to have a high lithium ion migration number, a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40C08J9/28C08F259/08C08F259/04H01M10/0565
CPCY02E60/10
Inventor 解孝林王晓恩李卫洪华生龚春丽薛志刚廖永贵周兴平
Owner HUAZHONG UNIV OF SCI & TECH
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