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Method for preparing composite negative electrode on cerium-based electrolyte isolation layer through low-temperature sintering

A composite cathode and electrolyte technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve the problems of low battery performance, difficult powder uniform dispersion, and reduction of effective reactive sites in the cathode, etc., to achieve large specific surface area, Avoid the effect of non-uniform distribution of the two phases

Active Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional method of mechanical mixing to prepare composite cathodes is not only difficult to disperse the powder evenly, resulting in the reduction of the effective reactive sites of the cathode, but also requires high temperature (≧1000°C) sintering, which makes the particle growth more serious and the loss of the three-phase interface. Severe, so both lead to lower battery performance

Method used

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  • Method for preparing composite negative electrode on cerium-based electrolyte isolation layer through low-temperature sintering
  • Method for preparing composite negative electrode on cerium-based electrolyte isolation layer through low-temperature sintering
  • Method for preparing composite negative electrode on cerium-based electrolyte isolation layer through low-temperature sintering

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Embodiment 1

[0023] Co-synthesized by the ammonium citrate method

[0024] La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-ζ / Gd 0.1 Ce 0.9 o 1.95 =60:40wt% composite cathode material, where La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-ζ Take 0.05mol. Weigh 0.7783gGd 2 o 3 Powder (analytically pure), in a 500ml beaker, add HNO 3 (analytical pure) after stirring to dissolve completely, weigh 16.7817gCe(NO 3 ) 3 ·6H 2 O,12.9872gLa(NO 3 ) 3 ·6H 2 O (analytical pure), 4.2325gSr (NO 3 ) 2 (analytical pure), 2.9105gCo(NO 3 ) 2 ·6H 2 O,16.16gFe(NO 3 ) 3 9H 2 O (analytical pure) was added into a beaker with deionized water and stirred to dissolve it completely. Then add 52.1496g of ammonium citrate (analytical pure) according to the ratio of ammonium citrate: metal ion molar ratio of 1.5:1, adjust the pH=9 of the solution with ammonia water (analytical pure) to make the solution clear and transparent, then heat and stir to evaporate the solvent Pour the solution into an evaporating dish until the...

Embodiment 2

[0026] Co-synthesized by citric acid-EDTA method

[0027] La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-ζ / Gd 0.1 Ce 0.9 o 1.95 =60:40wt% composite cathode material, where La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-ζ Take 0.05mol. Weigh 0.7783gGd 2 o 3 Powder (analytically pure), in a 500ml beaker, add HNO 3(analytical pure) after stirring to dissolve completely, weigh 16.7817gCe(NO 3 ) 3 ·6H 2 O,12.9872gLa(NO 3 ) 3 ·6H 2 O (analytical pure), 4.2325gSr (NO 3 ) 2 (analytical pure), 2.9105gCo(NO 3 ) 2 ·6H 2 O,16.16gFe(NO 3 ) 3 9H 2 O (analytical pure) was added into a beaker with deionized water and stirred to dissolve it completely. Then according to citric acid: EDTA: the ratio of metal ion mol ratio is 1.2:1.2:1 to add 36.0454g citric acid (analytical pure), 50.1281gEDTA (analytical pure), adjust the pH=9 of solution with ammonia water to make solution become clear and transparent, Then heat and stir to evaporate the solvent until the solution becomes viscous and sol-lik...

Embodiment 3

[0029] Prepare La as in Example 1 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-ζ / Gd 0.1 Ce 0.9 o 1.95 =60:40wt% composite cathode material, after grinding evenly, add 40wt% cathode glue (the composition of adding glue is the terpineol (90wt%) solution that dissolves ethyl cellulose (10wt%)) configuration cathode slurry, coating 0.0100 g to Gd 0.1 Ce 0.9 o 1.95 Tested on the self-assembled battery evaluation device after sintering at 700°C for 2 hours on the interlayer, and tested the I-V curve after polarizing at 700°C for 18 hours, the results are as follows Figure 4 shown.

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Abstract

The invention provides a method for preparing a composite negative electrode on a cerium-based electrolyte isolation layer through low-temperature sintering. According to the method, an ammonium citrate co-synthesis method is adopted to prepare battery negative electrode powder; roasted and phased powder is configured into negative electrode paste, and a three-in-one positive electrode / / electrolyte / cerium-based electrolyte isolation layer is coated with the paste; and the obtained product is sintered at a temperature of 700-800 DEG C to obtain the battery negative electrode. The composite negative electrode has perovskite and cubic fluorite phase at the same time, and the composite negative electrode is a mixed ion-electron conductor and has small and uniform particle sizes and large specific surface area; and compared with the negative electrode prepared by a conventional mechanical mixing method, the highest power density of the negative electrode prepared by the invention at a temperature of 700 DEG C is improved by about 20%, and stable operation of the battery can be achieved.

Description

[0001] Technical field: [0002] The invention relates to a solid oxide fuel cell composite cathode, in particular to a method for preparing a solid oxide fuel cell composite cathode by low-temperature sintering [0003] Background technique: [0004] Solid oxide fuel cells (SOFCs) are energy conversion devices that directly convert chemical energy stored in fuels and oxidants into electrical energy. Compared with traditional energy production technologies, they have high production efficiency, clean and pollution-free, and a wide range of applications. It is one of the most promising clean energy technologies at present. Reducing the operating temperature of SOFC to below 800°C is based on the fact that cheap stainless steel can be used as the connector to reduce the operating cost of SOFC; and it can suppress the reaction between the various components of the battery and solve the problems of sealing and thermal degradation of battery components, so it has become the main dev...

Claims

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Application Information

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IPC IPC(8): H01M8/10H01M4/86H01M4/88
CPCH01M4/86H01M4/8647H01M4/88H01M4/8885H01M8/10Y02E60/50
Inventor 程谟杰尚磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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