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Method for preparing solid-state polymer zinc-air battery

a solid-state polymer and zinc-air technology, applied in the field of solid-state polymer zinc-air batteries, can solve the problems of low conversion rate, energy development facing enormous challenges ahead, and the gizmo energy system of the 20th century cannot meet the requirements of high-efficiency, etc., and achieves greater discharge rate, greater power, and large surface area

Inactive Publication Date: 2007-03-01
MING CHI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a solid-state polymer Zn-air battery that uses environmentally friendly materials. It solves the battery leakage problem and allows for the battery to be applied in small and thin electronic devices. The battery uses electrolytically-prepared dendritic zinc powders with large surface area in the zinc electrode, which offers greater power, discharge rate, and higher utilization percent of zinc. The battery has shown high energy density by volume and weight under various testing conditions.

Problems solved by technology

The gigantic energy system we built up in the 20th century can not meet the. requirements for high-efficiency, clean, economical and safe energy system for the future.
In short, energy development is facing tremendous challenges ahead.
But constrained by Carnot cycle, thermo-mechanical process not only results in low conversion rate, leading to waste of energy, but also generates large amount of dust, carbon dioxide, NOx, SOx and other harmful substances as well as noise, leading to the pollution of air, water and soil and seriously threatening the living environment of mankind.

Method used

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  • Method for preparing solid-state polymer zinc-air battery
  • Method for preparing solid-state polymer zinc-air battery

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

Synthesis of PVA-GF Solid-State Alkaline Polymer Electrolyte

[0119] Weigh accurately 8.0 g of polyvinyl alcohol (PVA) and 40 g of water and place them into reactor. Measure the weight of reactor with PVA, water and agitator in it and record it. Agitate for one hour under ambient temperature until PVA is completely dissolved. Dissolve 12.5 g of potassium hydroxide (KOH) in 10 g of water and then pour it into the reactor. Raise the reactor temperature to 70° C. and control the polymerization time to under 30 min. Measure the weight of reactor with resulting polymer inside and record it, and spread viscous polymer of specific weight (about 5˜10 g polymer solution) on glass fiber (GF) and place it in temperature / humidity chamber (control the humidity at 40 RH % and temperature at 60° C.) for one hour. After that, take it out and leave it in atmosphere for 30 min to one hour. Remove the alkaline polymer film and weigh it to calculate its chemical composition after drying. Preserve the po...

embodiment 2

Preparation of Dendritic Zinc Powder

[0122] Select nickel plate as negative and positive plates and dissolve 7 wt % of ZnO in 8M KOH aqueous solution. Carry out electroplating for one hour under different temperature (30° C., 50° C., 70° C.) and at different current densities (50 mA / cm2, 100 mA / cm2, 200 mA / cm2, and 250 mA / cm2). Post-electroplating treatment of dendritic zinc powder is a highly important process; scrap electroplated zinc powder off from the negative plate and wash it with ultra-pure D.I. water, vibrate with ultrasound device for 30 min and filter, then repeat the washing until the zinc powder is thoroughly cleansed off residual electrolyte. After the zinc powder is dried, seal it with zipper bag and place it in oven to prevent the oxidation of zinc.

[0123]FIG. 19 is the graph of plating potential vs. time at constant current. It is learned that the higher the current density, the greater drop of potential, that is, the more serious the polarization and representing g...

embodiment 3

Preparation of Zinc Gel Anode

[0124] Weigh 1% In(Ac)3 inhibitor and add in 7M KOH solution. Agitate the solution to let the inhibitor distribute evenly. Mix 20 wt % dendritic zinc powder, 80 wt % molten zinc alloy powder into the gel just prepared. Vibrate the aforesaid solution in ultrasonic device for one hour. Add in proper amount of poly-acrylic polymer gelling agent (e.g. CMC, PVA, and capabol) and agitate evenly to obtain highly viscous gel. This completes the preparation of zinc gel anode.

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Abstract

This invention relates to a method for fabricating solid-state alkaline polymer Zn-air battery, which consists of a zinc-gel anode, an air cathode electrode, and alkaline polymer electrolyte. The formulation of said zinc gel anode is similar to that of alkaline Zn—MnO2 battery. The zinc gel anode contains a mixture of electrolytic dendritic zinc powders, KOH electrolyte, gelling agent and small amount of additives. The air cathode electrode is made by carbon gas diffusion electrode, which comprises two layers, namely gas diffusion layer and active layer. The active layer on the electrolyte side uses a high surface area carbon for oxygen reduction reaction and potassium permanganate and MnO2 as catalysts for oxygen reduction. The diffusion layer on the air side has high PTFE content to prevent KOH electrolyte from weeping or climbing. Due to adequate amount of fresh air and oxygen supply, the air cathode electrode can run continuously. Theoretically, the polymer zinc-air battery is an accumulator if the cell has sufficient zinc powder and electrolyte, and the air cathode plays the role of energy transfer.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a method for preparing solid-state polymer Zn-air battery which uses environmentally friendly carbon material and zinc powder. [0003] 2. Description of the Related Art [0004] Energy drives economic growth. It is also an important indicator gauging the strength and civilization of a country and living standard of its people. History illustrates that each innovative breakthrough in energy technology brought significant and profound influence on productivity and advancement of the civilization, demonstrating the importance of energy technology and its major influence on emerging industries. [0005] Environmental protection has become an issue the human society is highly concerned about in the 21st century. It is the core issue in mapping out strategy for sustainable development and a key factor influencing the energy policy and technological orientation of countries. At the same time, it is a g...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25B11/04H01M12/06
CPCH01M12/06Y02E60/10
Inventor YANG, CHUN-CHENLIN, SHENG-JENHUANG, CHI-NENGCHIU, JUNG-MING
Owner MING CHI UNIVERSITY OF TECHNOLOGY
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