Metal oxide cathode material, composite cathode material and battery

A technology of oxide cathodes and cathode materials, which is applied in fuel cells, solid electrolyte fuel cells, battery electrodes, etc., can solve the problems of mismatching thermal expansion coefficients between cathodes and electrolytes, complex synthesis of cathode materials, and reduced catalytic activity of cathodes. Synthetic preparation process requirements, superior performance, and the effect of more reaction sites

Active Publication Date: 2021-01-05
浙江氢邦科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the relevant patents and literatures, the cathodes used in solid oxide fuel cells are mostly perovskite and spinel metal oxide materials. The disadvantages are that the synthesis of perovskite and spinel metal oxide cathode materials is complicated and the cost is relatively high. High, and the cathode material generally contains elements such as Sr and Co. Sr elements tend to diffuse to the electrode surface at high temperatures, resulting in a decrease in the catalytic activity of the cathode. At the same time, Sr elements diffuse to the electrolyte and react to form SrZrO 3 Low conductivity impurity phases; Co element is easy to cause the thermal expansion coefficient mismatch between the cathode and the electrolyte, and the cathode is easy to fall off during high temperature operation, which accelerates the battery decay rate
[0006] Mullite-type metal oxides are mainly used as electrode materials in the field of nitrogen oxide catalysis and low-temperature proton exchange membrane fuel cells. In the field of medium-high temperature solid oxide fuel cells, there is no published research and application.

Method used

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  • Metal oxide cathode material, composite cathode material and battery
  • Metal oxide cathode material, composite cathode material and battery
  • Metal oxide cathode material, composite cathode material and battery

Examples

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preparation example Construction

[0034] For the preparation method of the above-mentioned cathode material, sol-gel method, precipitation method, solid-phase reaction method, hydrothermal method or solid-liquid composite method, and other preparation methods can be freely selected according to requirements.

[0035] In terms of sol-gel method, the process flow is as follows: according to the stoichiometric ratio of the elements in the chemical composition formula of the cathode material, the corresponding mass of metal salt is mixed with deionized water, complexing agent, etc., and then placed in a water bath to evaporate The precursor is obtained by stirring and evaporating in the container; the precursor is dried and 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 stoichiometric ratio of the elements in the chemical composition formula of the cathode material...

Embodiment 1

[0047] Preparation of YCu by sol-gel method 1.85 Fe 0.15 o 4.85 cathode

[0048] 1. Preparation of cathode material: Take yttrium nitrate, copper acetate, and 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 complexing agents, wherein the raw materials, The mass ratio of deionized water to citric acid is 1:5:1.2. After stirring the raw material mixture with a glass rod to fully dissolve it, heat it in a water bath. The sol was evaporated to dryness, dried in an oven at 250°C for 3 hours, and then calcined in a furnace at 800°C for 2 hours. Add alcohol to the calcined product, the mass ratio of calcined product to alcohol is 1:3, and the mixture is ground and dried at high speed in a ball mill to obtain the target product.

[0049] In order to test the electrical conductivity of the cathode material, the prepared powder was dry-pressed into a green body of 5*...

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, iron nitrate, and titanium acetate as raw materials according to the corresponding chemical formula, put the raw materials into a container, add deionized water to fully dissolve, and then add oxalic acid, wherein the raw materials, deionized 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 put into a furnace for calcination at 800°C for 2 hours. Add alcohol to the calcined product, the mass ratio of calcined product to alcohol is 1:3, and the mixture is ground and dried at high speed in a ball mill to obtain the target product.

[0059] The conductivity testing method of cathode material is identical with embodiment one, and its test result is as follows figure 2 , it can be seen that at 750 °C BaFe 1.85 Ti 0.15 o 4.8 The conductivit...

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Abstract

The invention discloses a metal oxide cathode material, and provides a composite cathode material and a battery using the composite cathode material. The chemical formula of the cathode material is A'B' yB 'xyO5 + / -delta, wherein A' is one of alkaline earth metal elements of Ba, Sr, Bi, Ce, Gd, Ca, Y and Pr, B 'and B' 'are two different transition metal elements including Fe, Co, Ni, Cu, Ti, Nu,Cr and Sc, and x satisfies the relational expression that 1.5<= x<= 2, y satisfies the relational expression that 0<=y<=1.98,deltaindicates excess or lack of oxygen. The cathode material has high thermal stability at high temperature, which is close to the thermal expansion coefficient of an electrolyte, and is conducive to reducing the decay rate of the battery. The cathode material is particularly suitable for medium-high temperature solid oxide fuel batteries. When the cathode material is applied to a battery, a high-temperature sintering barrier layer is not needed to be arranged between acathode and an electrolyte; in addition, the synthesis process is simple, and the preparation cost of the cathode material and a subsequent battery is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to metal oxide cathode materials, composite cathode materials and batteries using the materials. Background technique [0002] The solid oxide fuel cell is an all-solid-state chemical power generation device that directly and efficiently converts the chemical energy stored in the fuel into electrical energy at medium and high temperatures. The structural layer of a single cell is mainly divided into a support, an active anode, an electrolyte, a cathode, etc., in which the oxygen in the air forms an electrode of oxygen ions under the catalysis of the cathode material. [0003] The performance of the cathode is one of the key materials that determine the life of the battery. At present, there are many types of cathode materials, which are mainly divided into single perovskite ABO in terms of structure. 3 , double perovskite A 2 B 2 o 5 , spinel type AB 2 o 4 , and the fluorit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/12
CPCH01M4/8647H01M4/8652H01M4/8605H01M4/88H01M2008/1293Y02E60/50
Inventor 曹宝华官万兵杨钧常晓辉刘武王建新
Owner 浙江氢邦科技有限公司
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