Lithium ion capacitor diaphragm and production method thereof

A production method, lithium ion technology, applied in the direction of hybrid capacitor separators, capacitors, electrolytic capacitors, etc., can solve the problems of nanoparticle agglomeration, fiber film influence, etc., achieve simple process, reduce liquid absorption rate, and improve ion conductivity Effect

Pending Publication Date: 2020-12-22
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these nanoparticles are prone to agglomeration, which has a great impact on the continuous preparation of fiber membranes during electrospinning.

Method used

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  • Lithium ion capacitor diaphragm and production method thereof
  • Lithium ion capacitor diaphragm and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Polyvinylidene fluoride and 0.025mol / L TBAPF6 with a concentration of 16% are dissolved in N, N-dimethylformamide and acetone mixed solvent (the volume ratio of the two is 3: 1), and then using magnetic force The stirrer was stirred at room temperature for 1 hour to form a uniformly mixed spinning precursor solution.

[0024] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.35mm, and the extrusion rate of the needle solution is 0.5mL h -1 . A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip and the collector is 15 cm. During the electrospinning process, the applied electrostatic voltage was 30kV. After the solvent evaporated, the polyvinylidene fluoride multiscale nanofiber membrane doped with TBAPF6 organic branched salt was obtained on the receiving device.

[0025] (3) Put the polyvinylidene fluoride mul...

Embodiment 2

[0027] (1) Dissolve polyvinylidene fluoride and 0.05mol / L TBAPF6 with a concentration of 14% in N,N-dimethylformamide and acetone mixed solvent (the volume ratio of the two is 4:1), and then use magnetic force to The stirrer was stirred at room temperature for 1.5 hours to form a uniformly mixed spinning precursor solution.

[0028] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.45mm, and the extrusion rate of the needle solution is 1.0mL h -1 . A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip and the collector is 20 cm. During the electrospinning process, the applied electrostatic voltage was 25kV. After the solvent evaporated, the polyvinylidene fluoride multiscale nanofiber membrane doped with TBAPF6 organic branched salt was obtained on the receiving device.

[0029] (3) Put the polyvinylidene fluoride multisc...

Embodiment 3

[0031] (1) Polyvinylidene fluoride and 0.075mol / L TBAPF6 with a concentration of 15% are dissolved in N, N-dimethylformamide and acetone mixed solvent (the volume ratio of the two is 2: 1), and then use magnetic force The stirrer was stirred at room temperature for 2 hours to form a uniformly mixed spinning precursor solution.

[0032] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.45mm, and the extrusion rate of the needle solution is 1.5mL h -1 . A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip and the collector is 10 cm. During the electrospinning process, the applied electrostatic voltage was 20kV. After the solvent was evaporated, the polyvinylidene fluoride multiscale nanofibrous membrane doped with TBAPF6 organic branched salt was obtained on the receiving device.

[0033](3) Put the polyvinylidene fluoride...

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Abstract

The invention discloses a lithium ion capacitor diaphragm and a production method thereof. The production method comprises the following process steps: (1) preparing polyvinylidene fluoride, N, N-dimethylformamide, acetone and TBAPF6 according to a certain proportion, and uniformly stirring; (2) preparing a polyvinylidene fluoride nanofiber membrane doped with TBAPF6 by utilizing an electrostaticspinning technology; and (3) drying the polyvinylidene fluoride nanofiber membrane doped with TBAPF6 in a vacuum drying oven. Compared with the prior art, the preparation method disclosed by the invention is simple in process and high in production efficiency, and the prepared TBAPF6-doped polyvinylidene fluoride polymer diaphragm for the lithium ion capacitor has a special multi-scale fiber network structure, good lyophilicity, excellent mechanical properties and excellent thermal properties, is beneficial to enhancing the ionic conductivity of the diaphragm, improving the compatibility between the diaphragm and an electrode and improving the cycling stability of a capacitor, and can be applied to the fields of new energy automobiles, intelligent electronic products and the like.

Description

technical field [0001] The invention belongs to the technical fields of textile, polymer and energy materials and advanced manufacturing, and relates to a production method of polyvinylidene fluoride multi-scale nanofiber polymer membrane doped with TBAPF6 organic branched salt for lithium ion capacitors. Background technique [0002] As a new energy storage product with high energy density, high power density and long cycle life, lithium-ion capacitors are expected to be used in many fields such as new energy vehicles, smart electronic products, aerospace, solar energy, wind energy and various electric tools. Get widely used. As one of the four key components of lithium-ion capacitors (positive electrode, negative electrode, diaphragm, and electrolyte), the diaphragm plays an important role in blocking the electronic conductance of the positive and negative electrodes in the capacitor and allowing the electrolyte ions to pass freely so that the ions conduct. An important d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/52H01G11/06B82Y40/00B82Y30/00
CPCH01G11/52H01G11/06B82Y40/00B82Y30/00Y02E60/13
Inventor 刘雍沈先磊厉宗洁康卫民范杰
Owner TIANJIN POLYTECHNIC UNIV
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