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Composite material for cathode catalyst layer of metal-air battery and preparation method and application thereof

A technology of metal-air batteries and composite materials, which is applied in the direction of battery electrodes, fuel cell half-cells, primary battery-type half-cells, circuits, etc. It is not suitable for large-scale application and other problems, so as to accelerate the efficiency of cathode oxygen catalytic reaction, facilitate large-scale production, improve energy density and overall battery performance.

Inactive Publication Date: 2021-03-16
SHENZHEN AUTOMOTIVE RES INST BEIJING INST OF TECH (SHENZHEN RES INST OF NAT ENG LAB FOR ELECTRIC VEHICLES)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The air cathode of a metal-air battery contains two very important reactions, the oxygen reduction reaction and the oxygen evolution reaction, and its low conversion efficiency to oxygen is the main constraint factor for the overall output power of the metal-air battery.
At present, the highly active oxygen reduction catalysts at the cathode mainly include Pt-based noble metal catalytic materials, while the highly active oxygen evolution catalysts mainly use Ru / Ir-based noble metal materials. reaction and oxygen evolution reaction, not suitable for large-scale application
[0004] The chemical formula of perovskite oxide crystal structure is ABO 3 , the A site is mostly selected from lanthanide or alkaline earth elements, and the B site elements are generally transition metals, which are much cheaper than other noble metals and can catalyze both oxygen reduction and oxygen evolution reactions. However, perovskite oxides usually have a specific surface area Small and low conductivity, can not get better intrinsic activity when used directly

Method used

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  • Composite material for cathode catalyst layer of metal-air battery and preparation method and application thereof
  • Composite material for cathode catalyst layer of metal-air battery and preparation method and application thereof
  • Composite material for cathode catalyst layer of metal-air battery and preparation method and application thereof

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preparation example Construction

[0075] In an implementation of this embodiment, the specific surface area of ​​the composite material is 200-500 m 2 g -1 . This embodiment also provides a method for preparing the above-mentioned composite material for the cathode catalyst layer of a metal-air battery, comprising: mixing metal-doped perovskite oxide with a nitrogen source, a boron source, a sulfur source, and a phosphorus source At least one and a carbon source, placed in a protective atmosphere for calcination, so that the metal-doped perovskite oxide surface in situ precipitates metal and obtain perovskite oxide, metal catalyst nitrogen source, boron source, sulfur source At least one of the phosphorus source and the carbon source generate doped carbon nanotubes, so as to prepare a composite material for the cathode catalyst layer of the metal-air battery.

[0076]This embodiment is used in the preparation method of the composite material for the cathode catalytic layer of the metal-air battery. When the ...

Embodiment 1

[0088] 1. Metal-doped perovskite oxide La 0.6 Sr 0.2 Ti 0.8 (Ni 0.5 co 0.5 ) 0.2 o 3-δ preparation of

[0089] This embodiment consists of the first component of lanthanum nitrate, the second component of strontium nitrate, the third component of tetrabutyl titanate, and the fourth component of a mixture of nickel nitrate hexahydrate and cobalt nitrate hexahydrate, the above four components Preparation of NiCo-doped perovskite oxide La by sol-gel method 0.6 Sr 0.2 Ti 0.8 (Ni 0.5 co 0.5 ) 0.2 o 3-δ , the specific preparation process is as follows:

[0090] First, tetrabutyl titanate and citric acid monohydrate were dissolved in deionized water at 85 °C under continuous vigorous stirring. The molar ratio of citric acid to tetrabutyl titanate is 5:1. After a clear solution is formed, the required stoichiometric amounts of lanthanum nitrate hexahydrate, strontium nitrate, nickel nitrate hexahydrate, and cobalt nitrate hexahydrate are added to the above solution.

...

Embodiment 2

[0107] 1. Metal-doped perovskite oxide Pr 0.7 (Ba 0.8 Ca 0.2 ) 0.15 Ti 0.85 (Co 0.75 Fe 0.25 ) 0.15 o 3-δ preparation of

[0108] This embodiment consists of the first component of praseodymium nitrate, the mixture of the second component of barium nitrate and calcium acetate, the third component of tetrabutyl titanate, and the fourth component of the mixture of cobalt nitrate hexahydrate and ferric nitrate nonahydrate, Cobalt-iron-doped perovskite oxide Pr 0.7 (Ba 0.8 Ca 0.2 ) 0.15 Ti 0.85 (Co 0.75 Fe 0.25 ) 0.15 o 3-δ , the specific preparation process is as follows:

[0109] First, dissolve tetrabutyl titanate and citric acid monohydrate in deionized water at 80°C under continuous vigorous stirring. The molar ratio of citric acid to tetrabutyl titanate is 5:1. After a clear solution is formed, then The required stoichiometric amounts of praseodymium nitrate hexahydrate, barium nitrate, calcium acetate, cobalt nitrate hexahydrate, and ferric nitrate nonahyd...

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Abstract

The invention discloses a composite material for a cathode catalyst layer of a metal-air battery and a preparation method and application thereof. The metal is separated out from the surface of perovskite oxide in situ, doped carbon nanotubes are formed by catalytic in-situ growth of the metal, and the doped elements of the doped carbon nanotubes are at least one of B, N, S and P. The composite material for the cathode catalyst layer of the metal-air battery has the advantages of high specific surface area, high conductivity, rich active sites, multiple active interfaces and low cost, can catalyze an oxygen reduction reaction and an oxygen precipitation reaction at the same time, improves the double-effect activity of perovskite oxide, and improves the conductivity and dispersity of perovskite oxide material. The composite material is applied to the metal-air battery, so that power density of the metal-air battery and the overall performance of the battery can be improved, meanwhile, the use of a noble metal catalyst material is avoided, and the production cost of the metal-air battery is reduced.

Description

technical field [0001] The invention relates to the field of metal-air batteries, in particular to a composite material used for the cathode catalytic layer of the metal-air battery, a preparation method and application thereof. Background technique [0002] Metal-air battery is a chemical power source at room temperature. It has the advantages of good low-temperature controllability, high energy density, stable discharge voltage, low cost, and environmental friendliness. It is a clean energy conversion device with great market application prospects in the future. Metal-air batteries usually use metals such as zinc, aluminum, lithium, and magnesium as the anode, lye or neutral solution as the electrolyte, and oxygen in the air as the cathode. During discharge, the metal at the anode is oxidized to the corresponding metal ions, while the O at the cathode 2 is reduced to OH - , an oxygen reduction reaction occurs; the process of charging is just the opposite of the discharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86H01M4/88H01M12/06
CPCH01M4/8647H01M4/8673H01M4/8825H01M4/9016H01M4/9083H01M12/06H01M2004/8689
Inventor 李凤姣王文伟
Owner SHENZHEN AUTOMOTIVE RES INST BEIJING INST OF TECH (SHENZHEN RES INST OF NAT ENG LAB FOR ELECTRIC VEHICLES)
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