Polymer electrolyte membrane and preparation method thereof

An electrolyte membrane and polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrolyte immobilization/gelation, etc., can solve the problem of unavailable, increased process/raw material costs, reduced ion exchange capacity and proton conductivity to achieve high proton conductivity, comprehensive performance improvement, and excellent mechanical properties

Active Publication Date: 2018-04-06
TORAY ADVANCED MATERIALS RES LAB CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Therefore, although the various methods proposed in the above-mentioned documents 1 to 8 have effectively reduced the dimensional change rate of the polymer electrolyte membrane after saturated water absorption, they have their own defects: or reduce the ion exchange capacity and proton conductivity, or increase However, the process / raw material cost has not been fundamentally solved the problem of how to reduce the dimensional change rate of the polymer electrolyte membrane simply and easily, and it is impossible to obtain a polymer electrolyte membrane with a dimensional change rate lower than 3%.

Method used

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  • Polymer electrolyte membrane and preparation method thereof
  • Polymer electrolyte membrane and preparation method thereof
  • Polymer electrolyte membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] (1) Raw materials

[0112] Polyether ether ketone film1

[0113] (2) Performance characterization

[0114] The polyetheretherketone film 1 has a thickness of 30 micrometers and an IEC of 0.5 mmol / g.

[0115] The polyether ether ketone film 1 had a dimensional change rate of 2.9% in the MD direction and a 2.9% dimensional change rate in the TD direction, and was excellent in water resistance. The mechanical strength was measured using a universal tensile machine, and the Young's modulus was 1.1 GPa, and the elongation at break was 180%. The proton conductivity was measured using an electrochemical test system, and it was 90 mS / cm at 80° C. and a relative humidity of 85%, and 2.1 mS / cm at 80° C. and a relative humidity of 25%.

Embodiment 2

[0117] (1) Orientation of polyether ether ketone film

[0118] At room temperature, soak the polyether ether ketone membrane 2 in deionized water to absorb water, take it out after standing for 12 hours, and dry the surface to obtain a saturated water-containing membrane. Fix the saturated water-containing film in a stretching fixture, place it in a stretching environment at 20°C, and perform biaxial stretching when it is slowly dehydrated to a water content of 35%. After stretching, keep the jig stretched, and move the stretched film into a setting room at 40° C. for 10 minutes of setting treatment. After the setting is finished, the stretched polyetheretherketone film 2 is taken out.

[0119] (2) Performance characterization

[0120] After stretching, the thickness of the polyetheretherketone film 2 is 17.8 microns, the actual stretching ratio is 1.3, and the IEC is 2.2 mmol / g.

[0121] Observation using a transmission electron microscope shows that the polyether ether ke...

Embodiment 3

[0123] (1) Orientation of the polymer electrolyte membrane

[0124] At room temperature, soak the polymer electrolyte membrane 1 in deionized water to absorb water, take it out after standing for 12 hours, and dry the surface to obtain a saturated water-containing membrane. Fix the saturated water-containing film in a stretching fixture, place it in a stretching environment at 45°C, and perform biaxial stretching when it is slowly dehydrated to a water content of 23%. After stretching, keep the jig stretched, and move the stretched film into a setting room at 45° C. for 10 minutes of setting treatment. After setting, take out the stretched polymer electrolyte membrane.

[0125] (2) Performance characterization

[0126] After stretching, the thickness of the polymer electrolyte membrane is 12.4 microns, the actual stretching ratio is 1.1, and the IEC is 2.2 mmol / g.

[0127] Observation with a transmission electron microscope shows that the polymer electrolyte membrane has a ...

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Abstract

The invention provides a polymer electrolyte membrane and a preparation method thereof. The polymer electrolyte membrane has ultralow dimensional change rate and high ion exchange capacity. Accordingto the invention, a method of stretching a water-containing membrane at low temperature is firstly adopted for preparing the polymer electrolyte membrane, and the polymer electrolyte membrane with lowdimensional change rate and maintaining high ion exchange capacity, proton conductivity and mechanical properties can be obtained by adopting a simple and low-energy-consumption method, so that durability of the polymer electrolyte membrane is greatly improved, service life of the polymer electrolyte membrane is greatly prolonged, and application prospect is clearer.

Description

technical field [0001] The invention belongs to the field of polymer electrolyte membranes, in particular to a polymer electrolyte membrane with a small dimensional change rate after water absorption and a preparation method thereof. Background technique [0002] A polymer electrolyte is a polymer ion conductor containing dissociable ionic groups. Because of its good conductivity and the unique characteristics of light weight, good elasticity and easy film formation of polymers, it has become a hot spot in the research and development of chemical power sources in recent years. At present, polymer electrolytes are mainly used in the fields of lithium-ion batteries or fuel cells and are often used in the form of membranes. For polymer electrolyte membranes, due to the alternating low humidity / high humidity environment during battery operation, the dimensional changes of dehydration / water absorption often occur. In the case of a large dimensional change rate, the polymer elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M8/1027H01M8/1032H01M8/1086
CPCH01M8/1027H01M8/1032H01M8/1093H01M10/0565H01M10/058H01M2300/0085Y02E60/10Y02E60/50Y02P70/50
Inventor 杨扬王晋韩文国田友之梅田浩明出原大辅后藤哲哉
Owner TORAY ADVANCED MATERIALS RES LAB CHINA
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