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Method for preparing single-ion conductive polymer electrolyte composite fiber diaphragm by means of electrospinning

A technology of electrospinning and composite fibers, which is applied in fiber processing, circuits, electrical components, etc., can solve the problems of complex process, difficult control of polymer membrane pore size and porosity, etc., achieve simple preparation process, improve battery cycle performance, The effect of large specific surface area

Active Publication Date: 2018-10-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are complicated, and the pore size and porosity of the obtained polymer membranes are difficult to control

Method used

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  • Method for preparing single-ion conductive polymer electrolyte composite fiber diaphragm by means of electrospinning
  • Method for preparing single-ion conductive polymer electrolyte composite fiber diaphragm by means of electrospinning
  • Method for preparing single-ion conductive polymer electrolyte composite fiber diaphragm by means of electrospinning

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Embodiment 1

[0029] Please refer to figure 1 , 2 , 3, the embodiment of the present invention provides a kind of method that electrospinning is used to prepare single-ion conductive polymer electrolyte composite fiber membrane, comprises the following steps:

[0030] (1) Weigh p-toluenesulfonamide and sodium hydroxide in an appropriate amount of water by molar ratio, heat and dissolve to form a solution, and slowly add p-toluenesulfonyl chloride with half the molar content of p-toluenesulfonamide to the above solution Reaction, after the reaction is completed, the reaction solution is cooled to room temperature, the pH value of the reaction solution is adjusted to be neutral, and the solid is completely precipitated;

[0031] (2) Filter the precipitated solid, adjust the pH value of the filtrate to be strongly acidic to form a white precipitate, perform suction filtration to obtain the crude product, wash the crude product, dry and recrystallize to obtain 4,4'-dimethylbisbenzenesulfonyl ...

Embodiment 2

[0038] According to the method of Embodiment 1 of the present invention, a single-ion conductive polymer electrolyte composite fiber membrane is prepared, comprising the following steps:

[0039](1) Take a 1L round bottom flask, add 0.6L deionized water and slowly add 0.25mol of sodium hydroxide under stirring conditions, after completely dissolving, add 0.2mol of 4-methylbenzenesulfonamide to the above Sodium hydroxide solution until completely dissolved; slowly add 0.1mol of 4-methylbenzenesulfonyl chloride, react at 95°C for 12h; After complete precipitation, filter to obtain a clear solution;

[0040] (2) Add an appropriate amount of concentrated hydrochloric acid to the filtrate to obtain a large amount of white solid. After suction filtration, the white product is obtained, and then placed in a blast drying oven for drying. Finally, the product 4,4'- is obtained after recrystallization in deionized water. Dimethylbisbenzenesulfonylimide is also vacuum-dried for subseque...

Embodiment 3

[0047] Refer to attached Figure 4 According to the method of Example 2 of the present invention, a single-ion conductive polymer electrolyte composite fiber membrane is prepared, the concentration of the PVDF-HFP / polybissulfonimide lithium solution is 15wt%, the spinning voltage is 25kv, and the solution flow rate is 5ul / min, The receiving distance is 15cm. All the other are with embodiment two.

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Abstract

The invention discloses a method for preparing a single-ion conductive polymer electrolyte composite fiber diaphragm by means of electrospinning and belongs to the technical field of preparation of battery diaphragms. PVDF-HFP and a polybisulfonimide lithium-based single-ion conductive polymer electrolyte are dissolved in a certain solvent according to a certain ratio to obtain an electrospinningsolution; the electrospinning solution is used for preparing a nanofiber membrane through an electrospinning technology, and finally vacuum drying is conducted to obtain the composite fiber diaphragm.Composite fiber membranes of different diameters can be obtained by adjusting parameters such as concentration, flow rate, voltage and receiving distance of the electrospinning solution. The composite fiber diaphragm prepared by the method has high porosity, high ionic conductivity and a good application prospect and is conductive to cycle performance of batteries.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragm preparation, in particular to a PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene copolymer) / polybissulfonimide lithium-based single-ion conductive polymer electrolyte composite fiber prepared by electrospinning Diaphragm method. Background technique [0002] The electrolyte plays the role of transferring charge between the positive and negative electrodes in the lithium-ion battery and is an important part of the battery. There are many types of electrolytes, but the performance of batteries obtained by combining different electrode materials and different electrolytes has huge differences. At present, the performance of lithium-ion batteries is mainly improved by developing new electrode materials or optimizing existing electrode materials. However, the development of new electrolytes or the optimization of existing electrolytes can also make an important contribution to the impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D04H1/728H01M2/16
CPCD01D5/0015D04H1/728H01M50/411H01M50/44Y02E60/10
Inventor 程寒松张运丰李翠翠
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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