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Quasi-solid electrolyte PVA-zinc-air battery

An air battery, PVA-KOH-H2O technology, applied in electrical components, battery electrodes, fuel cell-type half-cells and primary battery-type half-cells, etc., can solve the problem of reducing battery performance, direct oxidation of zinc electrodes, and battery leakage. Liquid and other problems, to prolong the service life of charging and discharging, solve the formation of zinc dendrites, and prevent the effect of battery leakage

Inactive Publication Date: 2014-08-13
EAST CHINA NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of the zinc electrode itself, its self-discharge reaction will occur, and in the process of charging it, dendritic zinc will grow out. Its shape is very sharp. When the charge reaches a certain level, the dendrite growth will puncture The separator of the battery, thus causing a short circuit and seriously reducing the performance of the battery
[0007] 2. Direct oxidation of zinc electrode
Since oxygen in the air dissolves in the electrolyte, HO2 is formed during the reaction - , if HO2 - If it is not decomposed, it will accumulate in the air electrode, and the zinc electrode will be directly oxidized, causing a negative potential shift, passivating the zinc electrode, and reducing the activity of zinc
[0008] 3. Battery leakage problem
Since the air electrode adopts a porous structure, oxygen circulates through the pores, so that the electrolyte will also flow out of the pores. If the leakage problem cannot be properly solved, it will also bring great problems to the performance of the zinc-air battery and seriously affect its performance. and lifespan

Method used

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  • Quasi-solid electrolyte PVA-zinc-air battery
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  • Quasi-solid electrolyte PVA-zinc-air battery

Examples

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Effect test

Embodiment 1

[0042] Example 1: 1) Weigh a certain amount of polyvinyl alcohol particles, mix them with water at 0.5:32, heat and stir in a water bath, the temperature of the water bath is 90°C, stir for 60 minutes, the transparent polyvinyl alcohol particles gradually disappear, and the water gradually becomes Viscous; 2) After the transparent particles are completely dissolved, continue to heat in a water bath for 10 minutes to evaporate excess water, so that the water content of PVA is 60%-70%; 3) Add 40%-50% of pre-prepared 5 ~6mol / L of KOH; obtain PVA solution; 4) place the PVA solution of step 3) at room temperature and allow it to cool naturally, the PVA solution gradually becomes a frozen solid, and when it does not completely become a frozen solid, put It drips into the battery case for final subsequent encapsulation.

Embodiment 2

[0043] Example 2: Same as the above steps, the difference is: 1) The mixing ratio of polyvinyl alcohol particles and water is: 1:40, the temperature of the water bath is 88 ° C, and stirred for 70 minutes; 2) After the particles are dissolved, continue heating in the water bath 20 minutes; 3) Add 40% of pre-prepared 7 mol / L KOH dropwise.

Embodiment 3

[0044] Example 3: The steps are the same as in Example 1, the difference is: 1) The mixing ratio of polyvinyl alcohol particles and water is: 1:30, the temperature of the water bath is 95°C, and stirred for 50 minutes; 2) After the particles are dissolved, continue Heat in a water bath for 20 minutes; 3) Add 50% of pre-prepared 7 mol / L KOH dropwise.

[0045] Preparation of zinc electrode:

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Abstract

The invention discloses a quasi-solid electrolyte PVA(Polyvinyl Alcohol)-zinc-air battery, which comprises an air electrode taking reduction action, a zinc electrode taking oxidation reaction, electrolyte and a battery case, wherein the air electrode, the zinc electrode and the electrolyte are accommodated in the battery case, the electrolyte is jelly solid PVA-KOH-H2O alkaline polymers (PVA quasi-solid electrolyte), and a battery diaphragm is arranged between the air electrode and the zinc electrode. The quasi-solid electrolyte PVA-zinc-air battery has the beneficial effects that 1, the adopted solid electrolyte is jelly solid and has a certain toughness, the growth of zinc dendrite can be obstructed, the battery internal short circuit caused by diaphragm piercing due to formation of zinc dendrite thorns is prevented, the service life of the battery is prolonged, and the integral performance of the battery is improved; 2, the occurrence of battery electrolyte leakage can be obviously prevented through the solid electrolyte, so the integral performance of the battery is improved.

Description

technical field [0001] The invention relates to a battery, in particular to a quasi-solid electrolyte-PVA zinc-air battery, which belongs to the technical field of new energy. Background technique [0002] For a long time, human beings have been using oil and coal as energy in production and life. With the continuous increase in energy demand in recent years, the reserves of non-renewable energy have gradually decreased. The energy crisis has begun to flash, and energy security has become a highly focused focus of every country. problem, but also a huge challenge we face. In this context, energy conservation, emission reduction, and green development are inevitable choices. It is urgent to seek new energy to replace fossil energy. With the continuous development of portable electronic products and the increasing demand for zero-emission electric vehicles, people are looking for a high-energy The battery of the system meets the requirements. As a new technology of efficient...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06
CPCH01M4/8605H01M12/06
Inventor 王连卫谭强徐少辉
Owner EAST CHINA NORMAL UNIV
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