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A multilayer functional structure and durable and stable electrically chargeable air electrode and its manufacturing method

A technology of air electrodes and functional structures, applied in the direction of battery electrodes, structural parts, electrical components, etc., to achieve the effects of stable long-term charge and discharge cycles, stable structure, and shortened air diffusion distance

Active Publication Date: 2021-03-26
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the defects of the prior art, to provide a multi-layer functional structure and durable and stable electric rechargeable air electrode and its manufacturing method, to solve the problem of repeated charge and discharge cycle stability of the existing air electrode under high current density And other issues

Method used

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  • A multilayer functional structure and durable and stable electrically chargeable air electrode and its manufacturing method
  • A multilayer functional structure and durable and stable electrically chargeable air electrode and its manufacturing method
  • A multilayer functional structure and durable and stable electrically chargeable air electrode and its manufacturing method

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preparation example Construction

[0060] The preparation process of the above-mentioned electrically chargeable air electrode can be as follows:

[0061] To prepare the OER composite catalytic layer, sintering method or paste method can be used:

[0062] 1.1. Sintering method

[0063] (1) Weigh non-noble metal transition metal salt compounds, oxides or hydroxides in a reagent flask, add distilled water or other solvents to form a solution, and control the total concentration of non-noble metal transition metal ions to 0.5-3.0M, preferably 1.0 -2.0M.

[0064] (2) After the current collector I is cleaned and degreased by ultrasonic waves in acetone solution, it is impregnated with the above solution, and then sintered at 200-400°C, the preferred temperature is 250-300°C, the sintering time is 30-180 minutes, and the preferred time is 60-120 Minutes, repeat the sintering process 1-2 times to form an apparently uniform OER composite catalytic layer.

[0065] 1.2. Ointment method

[0066] 1) Weigh non-noble metal...

Embodiment 1

[0085] OER catalyst and paste method to prepare OER composite catalytic layer:

[0086] Weigh nickel nitrate, cobalt nitrate (or ferric nitrate) dissolved in 25 ml of absolute ethanol to form a solution and magnetically stir to control the total metal ion concentration to 0.6-1.0M, wherein: the concentration ratio of nickel to cobalt ions is 2.5:5.0 , or the concentration ratio of nickel, cobalt and iron ion is 2.5:4.5:0.5, add 0.6N 60 milliliters of ammonia water dropwise to the range of pH value 8-9 in the mixed solution, and continue magnetic stirring to mix evenly, coprecipitate is centrifuged, Filter and wash with distilled water to remove other ions, and dry at 80°C to obtain a multi-component transition metal hydroxide composite catalyst. X-ray results see image 3 , structural analysis shows that the binary Ni-Co and ternary Ni-Co-Fe hydroxide catalysts have a hydrotalcite-like layered hydroxide structure, which is composed of (003), (006), (012) characteristic peaks ...

Embodiment 2

[0088] OER catalyst and sintering method to prepare OER composite catalytic layer:

[0089] Take metal foam nickel with a porous three-dimensional structure with a size of 3.0*5.5*0.15cm as the current collector, ultrasonically clean it in acetone solution for 30 minutes, corrode with dilute hydrochloric acid for 1 minute and rinse with distilled water for 3 times, then impregnate it in a metal containing nickel and cobalt. ion solution, wherein the concentration ratio of nickel and cobalt ions is 1:(2-X)(0≤X≤2), or immersed in an ethanol mixed solution containing nickel, cobalt and iron ions, wherein nickel, cobalt and iron The ion concentration ratio is 1:(2-X):X (0.1≤X≤2); the concentration of total metal ions in the solution is 2.0M; after the nickel foam is impregnated in the above mixed ion solution, it is sintered at 300°C for 40 minutes. Repeated impregnation and sintering for 2 times to obtain OER composite catalytic layer, in which the catalyst loading is 8-12mg / cm ...

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Abstract

The invention discloses a multi-layer functional structure and a durable and stable electrically chargeable air electrode, including sequentially stacked: an OER composite catalyst layer, an ORR catalyst layer, a current collector layer, and a waterproof gas diffusion layer; the invention sets the OER catalyst In the two-phase hydrophilic reaction catalytic zone where the electrode is in contact with the electrolyte, a large amount of oxygen and water vapor generated by charging can escape directly from the electrolyte to prevent diffusion and accumulation inside the electrode; the ORR catalytic layer is inside the electrode and is set in a waterproof gas diffusion layer Between the OER composite catalytic layer, it can not only shorten the air diffusion distance, but also facilitate the hydrophilic OH produced by the oxygen reduction reaction. ‑ Diffusion to the OER hydrophilic layer ensures the stability of the gas / solid / liquid three-phase interface structure inside the electrode. The electrode of the present invention can reduce the polarization potential of the OER reaction, eliminate the electrochemical oxidation corrosion of the carbon carrier and prevent the ORR catalyst from oxidative dissolution or phase change, at a higher current density (>=20mA / cm 2 ) to realize the effective and stable long-term charge-discharge cycle of the air electrode.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to an electrically chargeable air electrode and a manufacturing method thereof, in particular to a multilayer functional structure, durable and stable electrically chargeable air electrode and a manufacturing method thereof. Background technique [0002] The development of metal-air batteries with high specific energy density is to meet the needs of the country to actively promote the research and engineering development of metal-air batteries. Metal-air batteries mainly include zinc-air, aluminum-air, magnesium-air and lithium-air batteries, which have high specific energy density, abundant resources (except metal lithium resources), low price, non-toxic and non-polluting, and play the role of hydrogen fuel cells. Such advantages are the current research hotspots for new energy batteries at home and abroad, among which the design and manufacture of air electrode structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90
CPCH01M4/8657H01M4/8807H01M4/9016Y02E60/50
Inventor 胡伟康钟依均刘强吕天喜
Owner ZHEJIANG NORMAL UNIVERSITY
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