Solid-oxide fuel battery cathode powder preparation method

Abstract

The invention relates to a method for preparing cathode powder of solid oxide fuel batteries. The method is characterized in that lanthanum nitrate solution, manganese nitrate solution and strontium nitrate solution are prepared according to the proportion requirements of the metal elements in the cathode powder of the fuel battery and the solvent of the solution can be ethanol or / and hydrosolvent, and then the solutions are mixed evenly; the mixed solution is dried by spraying with a spray dryer to obtain white powder or gel matters; afterwards, the white powder or gel matters are put into a box-typed resistor furnace for baking to obtain the cathode powder of the solid oxide fuel battery. During the preparing course, technique ethanol is taken as the solvent, thus greatly reducing the temperature of an inlet and an outlet for the spraying drying and effectively preventing the decomposition of nitrate with low decomposition temperature. If deionized water is adopted as the solvent, by adjusting the feeding rate, not only can the decomposition of the nitrate be prevented, but also the preparing rate is increased and the cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing cathode powder of a solid oxide fuel cell. Background technique [0002] Reducing the cathode polarization resistance is a key factor in reducing the operating temperature of solid oxide fuel cells. The use of nanocrystalline high-performance cathode powders to prepare cathodes plays an important role in reducing cathode polarization resistance. Therefore, it is particularly important to develop a technology that can stably prepare high-performance nanocrystalline cathode powders. [0003] The preparation of cathode materials can be divided into solid phase and chemical methods. The solid-phase method is relatively simple, but the prepared powder is not uniform, and the particle size is usually 5 to 20 μm, while the powder prepared by the chemical method is relatively uniform, and the particle size is usually on the order of nanometers and submicrons. Chemical pulverization includes co-precipitation me...

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Problems solved by technology

Chemical pulverization includes coprecipitation method, sol-gel method, self-combustion method and other methods. Although the above methods can produce finer and uniform powder, the process is complicated, the process is long, the cost is high, and it is not easy to produce on a large scale.

[0004] The Chinese patent No. 86101030 reports a fuel cell cathode preparation method, which uses only a spray method, so it needs to be carried out in a relatively high temperature reactor, and there are still problems of complicated process, high cost, and difficulty in large-scale production. question

[0005] The inventor of the present invention used spray drying+cathode powder+industrial ethanol or / and deionized water+solid oxide fuel cell (Spray drying+Cathode powders+Alcohol or and distilled water+Solidoxide fuel cell) as key words to search the U.S. "Metals Abstracts" (Metals Abstracts), "Engineering Abstracts Index" (EI) in the United States, my country's "China Journal Network" and "VIP Chinese Periodical Database" and other scientific and technological literature indexes have not found complete relevant literature

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