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A kind of preparation method of perovskite type catalyst for metal-air battery

A metal-air battery and perovskite-type technology, which is applied in the direction of fuel cell half-cells and secondary battery-type half-cells, battery electrodes, circuits, etc., can solve the problems of high price and simplify the preparation process and difficulty , cost reduction effect

Active Publication Date: 2019-12-17
氢极新(上海)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cathode catalysts currently used to catalyze air reactions are usually carbon or carbon-supported noble metal catalysts, but they are expensive

Method used

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Examples

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Effect test

preparation example Construction

[0015] The preparation method of perovskite type catalyst for metal-air battery of the present invention, the chemical formula of described perovskite type catalyst is: La x Y (1-x) ZO 3 ; In the formula, 0<x<1, Y is Sr or Co, and Z is Mn or Fe; It comprises the following steps: (a) take by weighing lanthanum nitrate, nitric acid Y and nitric acid in molar ratio for x: 1-x: 1 Z, respectively dissolved in water, and then add ethylene glycol to form a mixed solution; (b) add a complexing agent to the mixed solution, adjust its pH value to 6-7 with ammonia water, and carry out stirring and complexing; then move to a constant temperature Stir in a water bath until gel is formed, then dry and grind into powder; (c) calcining the powder at 250-500°C. It does not need to be roasted at a high temperature above 500° C., which simplifies the preparation process and difficulty, and reduces the cost.

[0016] In step (a), the volume ratio of the water and ethylene glycol is 1-10:1. Th...

Embodiment 1

[0020] This embodiment provides a method for preparing a perovskite-type catalyst for a metal-air battery. The chemical formula of the perovskite-type catalyst is: La 0.6 Sr 0.4 MnO 3 , which includes the following steps:

[0021] (a) Take by weighing 0.6mol lanthanum nitrate, 0.4mol strontium nitrate and 1mol manganese nitrate, dissolve in 1000ml water respectively, then add 1000ml ethylene glycol to form a mixed solution;

[0022] (b) Add 2mol citric acid to the mixed solution, adjust its pH value to 6-7 with ammonia water, and carry out stirring and complexation; then move to a constant temperature water bath and stir at 90°C until a gel is formed, and then place the gel in Dry in a drying oven at 150°C and grind into powder;

[0023] (c) Calcining the powder at 350° C. for 10 hours.

Embodiment 2

[0025] This example provides a method for preparing a perovskite-type catalyst for metal-air batteries. The preparation process is basically the same as that in Example 1, except that in step (a), 0.4 mol of lanthanum nitrate, 0.6mol strontium nitrate and 1mol manganese nitrate, the final catalyst is La 0.4 Sr 0.6 MnO 3 .

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Abstract

The invention relates to a method for preparing a perovskite catalyst for a metal-air battery. The chemical formula of the perovskite catalyst is: La x Y (1‑x) ZO 3 ; In the formula, 0<x<1, Y is Sr or Co, and Z is Mn or Fe; It comprises the following steps: (a) take by weighing lanthanum nitrate, nitric acid Y and nitric acid for x: 1-x: l in molar ratio Z, respectively dissolved in water, and then add ethylene glycol to form a mixed solution; (b) add a complexing agent to the mixed solution, adjust its pH value to 6-7 with ammonia water, and carry out stirring and complexing; then move to a constant temperature Stir in a water bath until gel is formed, then dry and grind into powder; (c) calcining the powder at 250-500°C. It does not need to be roasted at a high temperature above 500° C., which simplifies the preparation process and difficulty, and reduces the cost.

Description

technical field [0001] The invention belongs to the field of metal-air batteries, and relates to a catalyst, in particular to a preparation method of a perovskite-type catalyst for a metal-air battery. Background technique [0002] Currently, the increasing demand for energy stimulates the research and development of alternative energy conversion and storage systems that are efficient, low-cost, and environmentally friendly. Oxygen reduction (ORR) and oxygen evolution reaction (OER) are at the heart of important renewable energy technologies, including fuel cells, lithium-air / oxygen batteries, and water splitting. If the inexhaustible oxygen in the air is continuously used to provide capacity, the theoretical energy density of lithium-air batteries is about 11140 Wh / kg, which is much higher than other energy storage devices. However, for this type of lithium-air battery, because a non-aqueous electrolyte is used, the discharge product Li that is insoluble in the organic ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M12/08
CPCH01M4/9016H01M12/08Y02E60/10
Inventor 田丙伦
Owner 氢极新(上海)新能源科技有限公司
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