Preparation method of P(VDF-HFP) (Poly(Vinyl Fluoride-Hexafluoropropylene)) inorganic compound porous nano fiber lithium ion battery separator

A lithium-ion battery, inorganic composite technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of unfavorable electrolyte absorption and ionic conductivity, high cost, unfavorable large-scale production, and high PVDF crystallinity. Good electrochemical stability, good interface stability, and the effect of improving charge-discharge efficiency

Inactive Publication Date: 2013-08-21
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PVDF used in this method has high crystallinity, which is not conducive to the absorption of electrolyte and the improvement of ion conductivi...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] At room temperature, weigh the dried P(VDF-HFP), PEG and nano-Al 2 O 3 (mass ratio is 8:1.8:0.2), P(VDF-HFP) and PEG were first added to a certain amount of DMF / acetone mixed solvent, and dissolved under magnetic stirring at 45°C until a transparent mixed solution was formed. The obtained mixed solution was cooled to room temperature, and the nano-Al 2 O 3 Add it into the mixed solution, stir at room temperature for a certain period of time to preliminarily disperse the nanoparticles, and then ultrasonically treat for 20 minutes to further uniformly disperse the nanoparticles in the solution to obtain a spinning solution.

[0029]Under the conditions of room temperature 25°C and humidity 30%, the above spinning solution was electrospun at a spinning rate of 0.1ml / h, and the applied voltage was 10kv; the spinning distance between the needle and the receiver was 10cm, The spun fibers were deposited on the receiver of the electrospinning equipment; after the spinning wa...

Embodiment 2

[0032] At room temperature, weigh the dried P(VDF-HFP), PEG and nano-ZrO 2 (mass ratio is 9:0.5:0.5), first add P(VDF-HFP) and PEG to a certain amount of DMAc / acetone mixed solvent, and dissolve under magnetic stirring at 50°C until a transparent mixed solution is formed. The obtained mixed solution was cooled to room temperature, and then the nano ZrO 2 Adding into the mixed solution, stirring at room temperature for a certain period of time to initially disperse the nanoparticles, and then ultrasonically treating for 15 minutes, further dispersing the nanoparticles uniformly in the solution to prepare a spinning solution.

[0033] Under the conditions of room temperature 25°C and humidity 40%, the above spinning solution was electrospun at a spinning rate of 0.4ml / h, and the applied voltage was 15kv; the spinning distance between the needle and the receiver was 15cm, The spun fibers were deposited on the receiver of the electrospinning equipment; after the spinning, the pre...

Embodiment 3

[0036] At room temperature, weigh the dried P(VDF-HFP), PEG and nano-TiO 2 (mass ratio is 8.5:1:0.5), first add P(VDF-HFP) and PEG to a certain amount of DMF / acetone mixed solvent, and dissolve under magnetic stirring at 50°C until a transparent mixed solution is formed. The obtained mixed solution was cooled to room temperature, and then the nano-TiO 2 Adding into the mixed solution, stirring at room temperature for a certain period of time to initially disperse the nanoparticles, and then ultrasonically treating for 30 minutes, further dispersing the nanoparticles uniformly in the solution to prepare a spinning solution.

[0037] Under the conditions of room temperature 25°C and humidity 30%, the above spinning solution was electrospun at a spinning rate of 0.6ml / h, and the applied voltage was 20kv; the spinning distance between the needle and the receiver was 20cm, The spun fibers were deposited on the aluminum foil receiver of the electrospinning equipment; after the spin...

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PUM

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Abstract

The invention relates to a preparation method of a P(VDF-HFP) [Poly(Vinyl Fluoride-Hexafluoropropylene)] inorganic compound porous nano fiber lithium ion battery separator. The method comprises the following specific steps of: (1) adding P(VDF-HFP) and PEG (Polyethylene Glycol) into an organic solvent; heating and agitating to dissolve to form a transparent solution; cooling the solution to be at room temperature; and dispersing inorganic nano grains into the solution by agitation and ultrasonic treatment to obtain a spinning solution; (2) statically spinning the obtained spinning solution to obtain a primarily-formed P(VDF-HFP) inorganic compound porous nano fiber membrane; and (3) immersing the primarily-formed P(VDF-HFP) inorganic compound porous nano fiber membrane into distilled water to remove the PEG; and carrying out drying treatment to obtain the P(VDF-HFP) inorganic compound porous nano fiber lithium ion battery separator. The lithium ion battery separator prepared by using the preparation method disclosed by the invention has high liquid absorption rate and good electrochemical stability, and has a good heat-resisting shrinkage performance.

Description

technical field [0001] The invention relates to a preparation method of a P(VDF-HFP) inorganic composite porous nanofiber lithium ion battery diaphragm, belonging to the field of nano functional materials and lithium ion batteries. technical background [0002] Lithium-ion batteries are mainly composed of positive and negative electrodes, a separator, and an electrolyte. The separator is between the positive and negative materials to isolate the positive and negative electrodes, prevent short circuit, prevent electrons from passing through, and allow ions to pass through. The performance of the separator determines the internal resistance and internal interface structure of the battery, which in turn affects the capacity, charge and discharge performance, cycle performance, and safety performance of the battery. Therefore, the performance of the separator has an important impact on the overall performance of the lithium-ion battery. [0003] Gel polymer electrolyte refers t...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 焦晓宁于宾周近惠康卫民程博闻王忠忠
Owner TIANJIN POLYTECHNIC UNIV
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