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Combined double-effect oxygen catalyst and electrode and battery containing same

A technology of oxygen catalyst and bifunctional catalyst, applied in the field of electrochemical energy storage

Inactive Publication Date: 2010-09-01
NAT ENG RES CENT OF RARE EARTH METALLURGY & FUNCTION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key factor for the successful development of double-effect air electrodes is a double-effect electrocatalyst with high catalytic activity for both oxygen evolution and oxygen reduction reactions. In terms of double-effect air electrode electrocatalysts, people have studied a variety of different catalysts, mainly Around noble metals, single metal oxides, metal organic compounds and composite oxides, etc., among which perovskite composite oxides have high electrocatalytic activity for double-effect air electrodes, but can only replace noble metal electrocatalysts in low-power applications

Method used

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  • Combined double-effect oxygen catalyst and electrode and battery containing same
  • Combined double-effect oxygen catalyst and electrode and battery containing same
  • Combined double-effect oxygen catalyst and electrode and battery containing same

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This example mainly illustrates the electrochemical performance of the air electrode prepared by using different types of combined catalysts described in the present invention. The air electrode is composed of a catalytic layer, a gas diffusion layer and a nickel mesh, and the structure schematic diagram is shown in figure 1 . The catalytic layer wherein is prepared according to the following process: take by weight respectively 48% VulcanXC72 and 12% PTFE emulsion, dissolve in distilled water, process 30min in a magnetic stirrer, after the two are mixed, and then place them in a magnetic stirrer Treat in the medium for 30 minutes, then put it into ultrasonic treatment for 10 minutes, and finally put it in an oven and dry it at 250 ° C for 2 hours. After cooling naturally, crush it, and then add the weight percentage to account for 16%. The representative ones described in the content of the present invention are different. Types of combined catalysts, including the co...

Embodiment 2

[0032] This example mainly illustrates the performance of a combined catalyst formed by combining two kinds of catalysts in different proportions. The air electrode was prepared according to the method in Example 1, and four catalyst combinations with different proportions were selected, which were 100% La 2 o 3 , 80% La 2 o 3 and 20% FeB, 40% La 2 o 3 and 60% FeB, 20% La 2 o 3 And 80% FeB, test condition is also identical with embodiment 1, according to 20mA / cm 2 The charging and discharging current cycle is 10 times, and the cycle discharge curve is shown in figure 2 .

[0033] It can be seen from the figure that the performance of the air electrode with different catalyst combinations is very different. The curve without FeB fluctuates greatly, while the curve with FeB is relatively flat. completely use La 2 o 3 The data of the catalyst fluctuates greatly, indicating that it is not stable enough, but the maximum discharge voltage is higher; the addition of 20% F...

Embodiment 3

[0035] This example visually illustrates the charge-discharge cycle stability performance of the air electrode prepared with the optimized combination of catalysts. The air electrode was prepared according to the method in Example 1, and the test conditions were exactly the same as in Example 1. According to 20mA / cm 2 The charging and discharging current cycles 10 times, the test results are shown in image 3 .

[0036] As can be seen from the figure, the use of perovskite LaCoO 3 The air electrode made of catalyst has a low initial discharge voltage, less than 1.2V (vs. Zn), and the discharge voltage shows a downward trend as the charge-discharge cycle proceeds. While using the optimized combined catalyst of the present invention, the curve as a whole is using LaCoO 3 type catalyst, the discharge voltage is significantly higher than that of LaCoO 3 , the discharge voltage is still around 1.3V after 10 charge-discharge cycles, which is significantly better than that of th...

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Abstract

The invention relates to a combined double-effect oxygen catalyst and an electrode and a battery containing the same. The catalyst is a combination of a non-crystalline alloy and a bifunctional catalyst. The electrode comprises a gas diffusion layer, a catalyst layer and a current collector electrically contacted with the catalyst layer, and is characterized in that the catalyst included in the catalyst layer is the combined double-effect oxygen catalyst of the invention. The battery mainly comprises an air electrode, a membrane and an anode, wherein the air electrode adopts a double-effect oxygen electrode. The catalyst and the electrode have the advantages that the catalyst has high catalytic activity and the electrode prepared from the same is characterized by high stability for charging and discharging circulation performance, high heavy-current discharging performance, high working voltage, simple preparation process and low cost.

Description

Technical field: [0001] The invention relates to a combined double-effect oxygen catalyst, an electrode and a battery containing the catalyst, and belongs to the technical field of electrochemical energy storage. Background technique: [0002] The double-effect oxygen electrode is the core component of hydrogen-oxygen fuel cells, metal-air secondary batteries, and metal hydride-air batteries. It is a gas-permeable, liquid-impermeable, conductive, and catalytically active film. The proportion is very small, and the remaining space can be used to fill the anode material, so this type of battery has high electrochemical capacity and mass specific energy. The double-effect oxygen electrode is the key technology for the research and development of this type of battery. Since oxygen can be obtained from the ambient air (atmosphere), this electrode can also be called a double-effect air electrode. One side is in contact with the electrolyte and the other side is in contact with oxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06H01M4/86H01M4/90
CPCY02E60/50Y02E60/128Y02E60/10
Inventor 孔繁清闫慧忠熊玮李金李宝犬王利
Owner NAT ENG RES CENT OF RARE EARTH METALLURGY & FUNCTION MATERIALS
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