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Electrolyte material with perovskite structure

A technology of electrolyte material and perovskite structure, used in solid electrolyte fuel cells, circuits, fuel cells, etc., can solve problems such as reducing cell efficiency and increasing electrolyte electronic conductance, reducing activation energy, facilitating conduction, and high conductance. rate effect

Active Publication Date: 2014-05-28
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

However, this modification introduces variable valence elements, which will increase the electronic conductance of the electrolyte, thereby reducing the efficiency of the battery.

Method used

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Embodiment Construction

[0013] The electrolyte material of perovskite structure that the present invention proposes, its chemical formula is La 1-a Sr a Ga 1-b-c Mg b Li c o 3-δ , where a=0.01~0.2, b=0.01~0.25, c=0.01~0.2, δ=(a+b) / 2+c.

[0014] The above-mentioned electrolyte material is characterized in that the method comprises the following steps:

[0015] (1) The molar ratio is (1-a):2a:(1-b-c):2b:c, respectively weigh lanthanum oxide, strontium carbonate, gallium oxide, magnesium oxide, lithium carbonate, and prepare the mixture;

[0016] (2) Put the raw materials weighed according to the above proportions into a ball mill jar, use alcohol as the medium, and zirconia balls as the grinding medium, and mill for 20 to 30 hours;

[0017] (3) Dry the mixed powder after ball milling at 60-80°C, pass through a 200-mesh sieve after grinding, and place the sieved mixed powder at 800-1000°C for 1-3 hours to obtain electrolyte material powder ;

[0018] (4) Grind the above electrolyte powder throug...

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Abstract

The invention relates to an electrolyte material with a perovskite structure, and belongs to the technical field of fuel cells. The electrolyte material is a novel electrolyte material LSGML (La1-aSraGa1-b-cMgbLicO3-delta, wherein a ranges from 0.01 to 0.2, b ranges from 0.01 to 0.25, and c ranges from 0.01 to 0.2) formed by partly replacing a conventional LSGM (La1-aSraGa1-bMgbO3-delta) electrolyte material by lithium elements. The electrolyte material has higher oxygen vacancy concentration and lower oxygen ion migration energy compared with the current LSGM, then has an electrical conductivity better than that of the LSGM at the same temperature, and is relatively suitable for being used as electrolyte of solid oxide fuel cells and solid oxide electrolytic cells.

Description

technical field [0001] The invention relates to an electrolyte material with a perovskite structure, belonging to the technical field of fuel cells and fuel electrolytic cells. Background technique [0002] A fuel cell is an energy conversion device that converts chemical energy into electrical energy through an electrochemical reaction. Because it directly converts chemical energy into electrical energy, it does not need to convert chemical energy into internal energy and mechanical energy before converting it into electrical energy like an internal combustion engine. Limited by the Carnot cycle, it can achieve high energy conversion efficiency. In addition, the fuel cell is environmentally friendly and will not release harmful gases such as nitrides or sulfides. Even if hydrocarbons are used as fuel, the emission of carbon dioxide is reduced by more than 40% compared with conventional power generation under the same power generation. The advantage of solid oxide fuel cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10
CPCH01M8/1016Y02E60/50
Inventor 林旭平钟海涛艾德生
Owner TSINGHUA UNIV
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