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Zinc-oxygen single liquid flow cell

A flow battery, zinc-oxygen single technology, used in electric power, energy chemical industry, electronics industry, transportation, mining and metallurgy fields, can solve the problems of dendrite growth, unstable thermodynamic properties, easy deformation of electrodes, etc. The effect of energy density and power density, high energy utilization efficiency, and simple manufacturing process

Inactive Publication Date: 2010-07-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct rechargeable zinc-air battery is to directly charge the zinc electrode of the zinc-air battery. The main problems in this process are: 1. The electrochemical activity of zinc in alkaline solution is very large, and the thermodynamic properties are unstable at the same time, and the charging products The solubility of zincate in strong alkaline solution is high, so the electrode is prone to deformation, dendrite growth, self-corrosion and passivation, which leads to the gradual failure of the electrode
2. The reversibility of the air electrode is poor, and it is easy to lose its catalytic activity during the charging process. In addition, it is easy to carbonate the electrolyte in the atmospheric environment and the influence of air humidity
The components of zinc paste after discharge reaction are complicated, and it is difficult to discharge it out of the battery body
Because these problems have not been solved, zinc-air fuel cells have not entered the practical stage so far.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] Positive electrode preparation

[0038] Nickel hydroxide and cobalt hydroxide are fully mixed according to a mass ratio of 95:5 and used as an oxygen evolution catalyst, nickel carbonyl powder is used as a conductive agent, and 60% (wt) polytetrafluoroethylene (PTFE) emulsion is used as a binder. The mass ratio is 85:10:5, mixed with propanol and water with a volume ratio of 1:1, and evenly scraped to a commercially available nickel foam with a thickness of 2.5mm (Hunan Kaiyuan Technology Co., Ltd. company) to form an oxygen evolution catalytic layer. Electrodeposition of NiCo with 3% (wt) Ag black powder 2 o 4 The powder is an oxygen reduction catalyst, nickel carbonyl powder is a conductive agent, and 60% (wt) PTFE emulsion is a binder, mixed in a ratio of 70:15:15 according to the mass ratio, and adjusted with acetone and water with a volume ratio of 1:1. Slurry was formed, and evenly scraped onto the other side of the nickel foam by wet squeegee method to form an...

Embodiment 2

[0046] Positive electrode preparation

[0047] The ternary composite hydroxide Ni with nickel, aluminum and cobalt 0.82 Al 0.15 co 0.03 (OH) 2 (atomic ratio) is an oxygen evolution catalyst, expanded graphite is a conductive agent, 60% (wt) polytetrafluoroethylene (PTFE) emulsion is a binder, mixes in the ratio of mass ratio 60: 25: 10, with 15ml volumetric concentration is 95% ethanol and 2ml of water were adjusted to make a slurry, then vacuum-dried at 80° C., and then repeatedly rolled into a 100 μm oxygen evolution catalytic membrane with a double-roll tablet press. To contain 5% (wt) NaBiO 3 The electrolytic manganese dioxide powder is an oxygen reduction catalyst, expanded graphite and acetylene black are a conductive agent, 60% (wt) PTFE emulsion is a binder, and the above four materials are mixed in a ratio of 60: 20: 5: 15 by mass, A slurry was prepared with acetone and water at a volume ratio of 1:1, dispersed by ultrasonic waves for 30 min, and the mixture was ...

Embodiment 3

[0055] Positive electrode preparation

[0056] Ag 2 O, Co(OH) 2 , Ni(OH) 2 The mixture is fully mixed according to the ratio of 10:5:85 in mass percentage and used as an oxygen evolution catalyst, the carbon powder is used as a conductive agent, and 60% (wt) polyvinylidene fluoride emulsion is used as a binder. Above-mentioned three kinds of materials are mixed with the ratio of mass ratio 80: 15: 5, with 25ml volume ratio is the mixed solvent of acetone and water of 1: 1 to adjust into slurry, evenly scrape with wet squeegee method to be 1.1mm in thickness, One side of the electrolytic nickel mesh with a pore diameter of 0.6 mm forms an oxygen evolution catalytic layer. electrolytic MnO 2 、Ag 2 O and NaBiO 3 The black powder after the powder is mixed evenly according to the mass ratio of 5:4:1 is the oxygen reduction catalyst, the graphite powder is the conductive agent, and the 60% (wt) PTFE emulsion is the binder, mixed in a ratio of 65:20:15 by mass, Use 20ml of ace...

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Abstract

The invention relates to a zinc-oxygen single liquid flow cell. Semi-shield type difunctional layer composite oxygen electrodes of two catalytic layer structures with the functions of catalyzing oxygen to reduce and separate are used as anode, wherein one layer for catalyzing the oxygen to reduce faces to the air and one layer for catalyzing the oxygen to separate faces to electrolyte. An inert electrode for deposing zinc is used as cathode; alkali solution containing zincate is used as electrolyte; a cell carries out the charge and discharge work under the circulation of a pump, so that the storage and power generation of electricity energy can be realized on a large scale.

Description

Technical field: [0001] The invention relates to a zinc-oxygen single-fluid flow battery, which belongs to the field of energy and chemical industry and can be widely used in the fields of electronics industry, transportation, electric power, mining and metallurgy, and the like. Background technique: [0002] Electric energy is an important guarantee for the development of the national economy. With the large-scale development and utilization of renewable energy such as nuclear power, wind energy, solar energy, and tidal energy, it is of great significance to develop efficient large-scale energy storage technologies in order to achieve stable power supply. Among the currently practical large-scale energy storage technologies, pumped water storage is the first to be used. It has a large scale and long life, but the geographical conditions are harsh and the construction cost is high. Among the chemical storage batteries, the flow battery (Flow cell, Flow battery), which is cu...

Claims

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Application Information

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IPC IPC(8): H01M12/06H01M12/02H01M4/02
CPCY02E60/128Y02E60/10
Inventor 潘军青籍利忠程杰孙艳芝文越华万平玉杨裕生
Owner BEIJING UNIV OF CHEM TECH
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