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Method for preparing microporous ionic liquid/gel polymer electrolyte fibres

A gel polymer, ionic liquid technology, applied in the direction of conjugated synthetic polymer rayon, fiber processing, fiber chemical characteristics, etc., can solve the problems of inability to meet industrial production, time-consuming and other problems

Inactive Publication Date: 2015-07-01
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The step-by-step method and the semi-continuous method are mainly used in theoretical research because the time required to form a polymer / gas saturated system is determined by the diffusion rate of gas to the polymer matrix, so it takes a long time and cannot meet the needs of industrial production.

Method used

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  • Method for preparing microporous ionic liquid/gel polymer electrolyte fibres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The ionic liquid: polymer: lithium salt: solvent: nano-additive is configured according to the ratio of 6%: 4%: 1mol / L: 88%: 2%, respectively dissolving P(VDF-HFP) in NMP, LiPF 6 , nano-titanium oxide and EMIPF 6 Soluble in NMP, and then import the two into a three-screw banburying extruder to mix to obtain a blend; introduce a supercritical fluid with a temperature of 50-380°C and a pressure of 7-40MPa into the three-screw banbury extruder and the above The blend is mixed and maintained at a certain pressure (7-17 MPa), supercritical CO 2 The mass ratio to the blend is 1:100~1:10. The blend is synthesized by reaction in a supercritical fluid. Then it is compacted by the screw compression section and gradually becomes a homogeneous body; the homogeneous body should pass through the filter medium to filter out impurities and residual catalyst after polymerization. The homogeneous body is metered by a gear metering pump to precisely control the fineness and uniformity ...

Embodiment 2

[0041] Dissolve polyoxyethylene, bis, trifluoromethyl sulfonyl-imide lithium and ionic liquid N-methyl-propylpyrrole di-trifluoromethyl sulfonyl-imide in NMP respectively, and then simultaneously introduce the three-screw Mix in an extruder to obtain a blend; 80°C, 16 MPa supercritical CO 2 The supercritical fluid is introduced into the three-screw mixer extruder to mix with the above blend and maintain a certain pressure (7-17 MPa), supercritical CO 2 The mass ratio to the blend is 1:100~1:10. The blend is synthesized by reaction in a supercritical fluid. Then it is compacted by the screw compression section and gradually becomes a homogeneous body; the homogeneous body should pass through the filter medium to filter out impurities and catalysts remaining after polymerization; the homogeneous body is measured by a gear metering pump for melt measurement to precisely control fiber fineness. degree and uniformity; the homogeneous body is extruded from the die spinneret hole t...

Embodiment 3

[0043] Dissolve EMIBF4 and PVDF-HFP in the solvent NMP respectively, and then introduce them into a three-screw mixer extruder to obtain a blend; 50°C, 7MPa supercritical N 2 The supercritical fluid is introduced into the three-screw mixer extruder to mix with the above blend and maintain a certain pressure (7-17 MPa), supercritical N 2 The mass ratio to the blend is 1:100~1:10. The blend is synthesized by reaction in a supercritical fluid. Then it is compacted by the screw compression section and gradually becomes a homogeneous body; the homogeneous body should pass through the filter medium to filter out impurities and residual catalyst after polymerization. The homogeneous body is metered by a gear metering pump to precisely control the fineness and uniformity of the fibers. The homogeneous body is extruded from the spinneret hole of the die head through the entrance area of ​​the melt blown die head, the hole flow area and the puffing area. While the homogeneous solid s...

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Abstract

The invention discloses a method for preparing microporous ionic liquid / gel polymer electrolyte fibres. The method comprises the following steps of: dissolving a certain amount of polymers in NMP (N-methyl-2-pyrrolidone), and dissolving lithium salt, nanometre additives and an ionic liquid in the NMP; then leading the raw materials in a three-screw mixing-extruding machine simultaneously, and mixing to obtain a blend; leading a supercritical fluid in the three-screw mixing-extruding machine, mixing the supercritical fluid with the blend aforementioned, and performing reactive synthesis on the blend in the supercritical fluid; then compacting the blend via a screw compression section and gradually forming a homogeneous-phase body; extruding the homogeneous-phase body from a spinneret orifice at a die head via a melt-blow die head inlet area, an orifice flow area and a bulking area, so as to form ultra-fine microporous fibres; naturally cooling, drying at a temperature of 80-120 DEG C, and then obtaining the ionic liquid / gel polymer electrolyte ultra-fine microporous fibres. The prepared ionic liquid / gel polymer electrolyte ultra-fine microporous fibres can meet the needs of the related fields based on lithium batteries, such as spinning, electricity, electronics, machinery, medical treatment, chemical industry, foods, aeronautics and astronautics.

Description

technical field [0001] The invention relates to a method for preparing microporous ionic liquid / gel polymer electrolyte fibers by spinning with a three-screw banburying extruder. Background technique [0002] At present, the electrolytes of lithium-ion batteries are mostly liquid organic solutions, and commonly used organic solvents include ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DEC), and the like. However, these organic solvents are flammable substances, and the liquid electrolyte has the risk of leakage. Therefore, under abuse conditions, such as heating, overcharging, overdischarging, short circuit, vibration, extrusion, etc., it is easy to cause fire, explosion and even personal injury. and other events. The polymer electrolyte has the advantages of no leakage, high specific energy, and good safety. It is of great significance for the development of a high-safety, green and environmentally friendly lithium-ion battery electrolyte system, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/16D01F8/10D01F8/02D01F8/18D01F1/10D01D1/00D01D5/098D01D5/247D01D10/06H01M2/16
CPCY02E60/10
Inventor 张迎晨张夏楠吴红艳
Owner ZHONGYUAN ENGINEERING COLLEGE