Ion selective membrane used by non-solid-state electrode and preparation method thereof

An ion-selective membrane, non-solid-state technology, applied in circuits, electrical components, battery components, etc., can solve the problems of low ion conductivity, high price, and inability to use solid-state ceramic membranes at room temperature

Active Publication Date: 2012-07-11
常州孚达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

General ion exchange membranes are sulfonic acid-based polymer membranes, or inorganic solid-state electrolyte membranes, such as Nafion membranes commonly used in flow batteries and fuel cells, and solid-state ceramic membranes used in high-temperature batteries, which are either very expensive, such as organic sulfur At present, t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take polyethylene oxide, dissolve it in water, and prepare a solution with a concentration of 5%, take 5ml of the solution, add 0.3% nano-titanium dioxide to it, and add 1ml of 0.5mol / L sulfuric acid solution, mix evenly and spread it on the porous PTFE membrane , and then cover it with another layer of PTFE membrane, and heat it under vacuum at 85°C for 17 hours to obtain an ion-selective membrane of intermolecular force type.

[0018] Membrane performance test: the anode and cathode catalysts are Pt-Ru / C and Pt / C respectively, PTFE is used as a binder, and carbon black is used as a conductive agent. The ratio of catalyst, binder, and conductive agent is 80:10:10. Calender to form a film, press it on a nickel mesh, fix the cathode and anode on both sides of the film respectively, place the gasket, and assemble it with the container. The effective area of ​​the electrode is 4cm 2 . The anode side is fed with 1mol / L methanol solution at a flow rate of 1mol / min, and the ...

Embodiment 2

[0021] Take polyvinyl chloride, dissolve it in tetrahydrofuran, prepare a solution with a concentration of 5%, take 5ml of the solution, add 0.5ml of 0.5mol / L lithium perchlorate solution to it, mix well and set aside.

[0022] Take industrial lithium manganate, mix it with acetylene black and PTFE according to the weight ratio of 90:5:5, and roll it into a film, press it on a nickel mesh as the positive electrode, apply the above solution on the positive electrode, and heat it under vacuum at 80 degrees Celsius for 14 hours to obtain A composite positive electrode covered with a diaphragm, 20% chromium sulfate is used as the negative electrode, 8% lithium sulfate is used as the supporting electrolyte, and the above composite positive electrode is assembled into a half-liquid lithium-ion battery. As a result, a specific capacity of 110mAh / g and a working voltage of 1.1V or more are obtained. , no capacity fading was observed after 20 cycles, indicating that the separator has a ...

Embodiment 3

[0024] Take lithium terephthalate and polymethyl methacrylate, dissolve them in 1-methyl-2-pyrrolidone (NMP), and prepare solutions with concentrations of 0.1% and 8% respectively, and apply the above solutions On a glass slide, the NMP was evaporated to obtain a membrane with a thickness of 100 microns.

[0025] Take industrial lithium manganate, mix and roll with acetylene black and PTFE according to the weight ratio of 90:5:5 to form a film, press on a nickel mesh as the positive electrode, 1mol / L vanadyl sulfate as the negative electrode, and 8% lithium sulfate as the supporting electrolyte. The diaphragm is assembled into a half-liquid lithium-ion battery. As a result, a specific capacity of 110mAh / g, an operating voltage of 1.2V or more, and no capacity decay after 30 cycles indicate that the diaphragm has a good application prospect.

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Abstract

The invention relates to a diaphragm containing a non-solid-state electrode for a chemical power supply system. The diaphragm is characterized by being an intermolecular force type ion exchange membrane, which comprises two basic components including a matrix and molecules with ion exchange activity, wherein the two components are bonded by means of intermolecular force, the component of the matrix of the membrane is selected from organic polymer compounds, preferably one or some of PMMA (Polymethyl Methacrylate), PP (Propene Polymer), PE (Poly Ethylene), PVDF (Polyvinylidene Fluoride), PTFE (Polytetrafluoroethylene), PVA (Polyvinyl Acetate), PVC (Polyvinyl Chloride), PAN (Polyacrylonitrile), PEO (Polyoxyethylene Oxide), CMC (Carboxy Methylated Cellulose), starch and polyacrylic acid, and the ion exchange active molecules are selected from micromolecular organic or inorganic acids, alkaline metal and alkali or salt of alkaline-earth metal. The diaphragm only allows alkaline metal ions, alkaline-earth metal ions or hydrogen ions and the like to pass through and doe not allow transition metal ions to pass through. The diaphragm is low in manufacturing cost and easy for industrialization realization, and has potential application values in the fields of flow batteries, air batteries and fuel batteries.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and relates to a diaphragm used in chemical power sources. Specifically, the invention relates to an ion-selective diaphragm used in a battery system in which all or one of the positive and negative electrodes is a non-solid state. Background technique [0002] Energy can exist in the form of solid, liquid or gas. Correspondingly, as an energy storage and conversion device, a chemical power source can use solid, liquid or gaseous electrodes. Solid state electrodes are the most common form. Alkaline-manganese batteries, zinc-silver batteries and other primary batteries, lithium-ion batteries, lead-acid batteries, iron-nickel batteries, cadmium-nickel batteries, hydrogen-nickel batteries, zinc-nickel batteries, rechargeable silver oxide batteries, rechargeable alkaline-manganese batteries and other secondary batteries , and electrochemical capacitors, the electrodes used are all solid electro...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 张汉平杜青李成钢孙晓辉
Owner 常州孚达新能源科技有限公司
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