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Ultrathin bipolar plate for vanadium battery, and preparation method of ultrathin bipolar plate

A bipolar plate, vanadium battery technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of low cross-sectional conductivity and thick thickness, and achieve the effects of thin thickness, improved energy density, and fewer operating units

Inactive Publication Date: 2019-05-21
江苏赛清科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ultra-thin bipolar plate material provided by the invention solves the problem of thicker thickness and lower cross-sectional conductivity of traditional bipolar plate materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] (1) Preparation of ultra-thin bipolar plates

[0085] 1) Select graphite flakes with an average particle size of 0.1 μm, add them to deionized water, and vigorously stir at 500 rpm. After 6 hours, a uniformly distributed conductive functional material spraying solution with a solid content of 35% is obtained.

[0086] 2) The polyethylene film with a thickness of 40 μm was washed repeatedly in excess absolute ethanol, and dried at 60° C. for later use.

[0087] 3) Further adopting a pressure of 1.5MPa, spray the conductive functional material spray liquid prepared in the above step 1) on both sides of the film respectively, the spray thickness is 300 μm, and the mass ratio of conductive functional material to film resin is 2:1.

[0088] 4) Put the film resin attached with the conductive functional material prepared in the above step 3) into a mold, hot press at 160° C. and 55 MPa for 20 minutes, and cool naturally to obtain the ultra-thin bipolar plate of the present inv...

Embodiment 2

[0096] (1) Preparation of ultra-thin bipolar plates

[0097] 1) Select graphene with an average thickness of 45nm and a plane size of 0.5×2 μm, add it to absolute ethanol, and vigorously stir at 300 rpm. After 12 hours, a uniformly distributed spray solution with a solid content of 50% is obtained.

[0098] 2) The polypropylene film with a thickness of 15 μm was washed repeatedly in excess deionized water, and dried at 80° C. for later use.

[0099] 3) Further adopting a pressure of 3.2MPa, spray the conductive functional material spraying liquid prepared in the above step 1) on both sides of the film respectively, the spraying thickness is 100 μm, and the mass ratio of conductive functional material to film resin is 1:1.

[0100] 4) Put the film resin attached with the conductive functional material prepared in the above step 3) into a mold, hot press at 200°C and 120MPa for 10min, and cool naturally to obtain the ultra-thin bipolar plate of the present invention.

[0101] (...

Embodiment 3

[0108] (1) Preparation of ultra-thin bipolar plates

[0109] 1) Select carbon fibers with an average diameter of 0.1 μm and a length of 5 μm, add them to acetone, and vigorously stir at 500 rpm to obtain a uniformly distributed spray solution with a solid content of 5% after 6 hours.

[0110] 2) The polystyrene film with a thickness of 115 μm was washed repeatedly in excess absolute ethanol, and dried at 70° C. for later use.

[0111] 3) Further adopting a pressure of 4 MPa, spray the conductive functional material spray liquid prepared in the above step 1) on both sides of the film respectively, the spray thickness is 1500 μm, and the mass ratio of conductive functional material to film resin is 5:1.

[0112] 4) Put the film resin attached with the conductive functional material prepared in the above step 3) into a mold, hot press at 180° C. and 40 MPa for 20 minutes, and cool naturally to obtain the ultra-thin bipolar plate of the present invention.

[0113] (2) Performance...

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Abstract

The invention provides an ultrathin bipolar plate for a vanadium battery, and a preparation method of the ultrathin bipolar plate. The bipolar plate is prepared by combining a spraying process and a hot-pressing process. The specific preparation method comprises the steps of spraying a solution containing a conductive functional material on the two side surfaces of a resin material, and carrying out hot pressing to obtain the bipolar plate. The bipolar plate prepared with the method has the following characteristics: (1) the thickness is smaller, and the thickness of the bipolar plate is adjustable in a wide range and can reach 30-1,000 [mu]m; (2) the electrical conductivity is higher, the thickness of the bipolar plate is small, the longitudinal electron transmission efficiency of the bipolar plate is improved, and the electrical conductivity is larger than 80 S / cm; and (3) the flexibility is better, and the bipolar plate has excellent toughness and can meet the requirement of batteryassembly. The bipolar plate disclosed by the invention is simple in preparation process, has few operation units, can be quickly popularized and can realize large-scale production.

Description

technical field [0001] The invention belongs to the field of vanadium battery manufacture, and in particular relates to an ultra-thin bipolar plate for a vanadium battery and a preparation method thereof. Background technique [0002] Vanadium battery is an ideal energy storage battery for large-capacity energy storage of renewable energy such as wind energy and solar energy. It occupies an important position in the research of all-vanadium redox flow battery. The performance index of the conductive bipolar plate has a significant impact on the power output and cycle life of the vanadium battery stack, so the preparation of a new type of bipolar plate with good electrical conductivity and excellent mechanical properties has made a breakthrough for all-vanadium redox flow batteries and has been applied on a large scale is of great significance. [0003] In view of the strict requirements of the stack on the bipolar plate, a bipolar plate with good performance needs to have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0213H01M8/0221H01M8/0228H01M8/18
CPCY02E60/50
Inventor 肖伟彭辉
Owner 江苏赛清科技有限公司
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