Metal oxide cathode material, composite cathode material and battery
An oxide cathode and composite cathode technology, applied in fuel cells, solid electrolyte fuel cells, battery electrodes, etc., can solve the problems of mismatching thermal expansion coefficients of cathodes and electrolytes, speed up battery decay rate, and complex cathode material synthesis. Synthetic preparation process requirements, superior performance, simple structure effect
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[0034] For the preparation method of the above cathode material, a sol-gel method, a precipitation method, a solid-phase reaction method, a hydrothermal method or a solid-liquid composite method, and other preparation methods can be freely selected according to requirements.
[0035] In terms of the sol-gel method, the process flow is as follows: according to the element stoichiometric ratio in the chemical composition of the cathode material, the corresponding mass of metal salt is added with deionized water, complexing agent, etc. and mixed evenly, and then placed in a water bath for evaporation. The precursor is obtained by stirring and evaporating in the container; the precursor is dried and then calcined at 700-900° C. for 1-5 hours, and the target powder is obtained after ball milling and drying.
[0036] In terms of the precipitation method, the process flow is as follows: according to the element stoichiometric ratio in the chemical composition molecular formula of the ...
Embodiment 1
[0047] Preparation of YCu by Sol-Gel Method 1.85 Fe 0.15 O 4.85 cathode
[0048] 1, the preparation of cathode material: take by weighing yttrium nitrate, copper acetate, ferric nitrate as raw materials according to the corresponding chemical formula, put the raw materials into a glass container, add deionized water and citric acid as a complexing agent, wherein the raw materials, The mass ratio of deionized water and citric acid was 1:5:1.2. After the raw material mixture was fully dissolved by stirring with a glass rod, it was heated in a water bath. The sol was evaporated to dryness, placed in an oven at 250°C for 3 hours, and then placed in a furnace for calcination at 800°C for 2 hours. The calcined product is added with alcohol, and the mass ratio of the calcined product to the alcohol is 1:3. After the mixture is ground and dried at high speed in a ball mill, the target product is obtained.
[0049] In order to test the electrical conductivity of the cathode materia...
Embodiment 2
[0057] Preparation of BaFe by Precipitation 1.85 Ti 0.15 O 4.8 cathode
[0058] 1. Preparation of cathode material: weigh barium nitrate, ferric nitrate, and titanium acetate as raw materials according to the corresponding compound formula, put the raw materials into a container, add deionized water to fully dissolve, and add oxalic acid, wherein the raw materials, deionized water are added. The mass ratio of water and oxalic acid is 1:8:4, the raw materials are fully stirred to form a suspension solution, dried in a spray dryer, and then placed in a furnace for calcination at 800 °C for 2 hours. The calcined product is added with alcohol, and the mass ratio of the calcined product to the alcohol is 1:3. After the mixture is ground and dried at high speed in a ball mill, the target product is obtained.
[0059] The conductivity test method of the cathode material is the same as in Example 1, and the test results are as follows figure 2 , it can be seen that BaFe at 750℃ ...
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