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Composite electrode material with low thermal expansion coefficient and preparation method and application thereof

A low thermal expansion coefficient, composite electrode technology, applied in the direction of electrodes, battery electrodes, circuits, etc., can solve the problems of limited expansion coefficient and the influence of electrode catalytic activity, so as to reduce the thermal expansion coefficient, promote commercial promotion, and closely integrate Effect

Pending Publication Date: 2022-04-12
SHENHUA NEW ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above schemes are limited in reducing the expansion coefficient and may negatively affect the catalytic activity of the electrode.

Method used

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  • Composite electrode material with low thermal expansion coefficient and preparation method and application thereof
  • Composite electrode material with low thermal expansion coefficient and preparation method and application thereof
  • Composite electrode material with low thermal expansion coefficient and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a method for preparing a composite electrode with a low thermal expansion coefficient by using the sol-gel method, and the specific details are as follows:

[0038] S1: Preparation of jelly

[0039] PrBaCo 2 o 5+δ @NdMnO 3 The stoichiometric ratio is dissolved in 200ml deionized water, in which neodymium manganate (NdMnO 3 ) and praseodymium barium cobalt (PrBaCo 2 o 5+δ ) is added according to the mass ratio of 1:1, heated to 90°C and stirred to make the water gradually volatilize to obtain a jelly;

[0040] S2: Precursor preparation

[0041] Dry the jelly obtained in S1 in an oven at 250°C to form a precursor powder;

[0042] S3: Preparation of composite electrode powder

[0043]Sintering the precursor obtained in step S2 at a constant temperature of 1100° C. for 5 hours, further ball milling the sintered powder for 24 hours, and sieving to obtain a composite electrode powder;

[0044] figure 1 It is a schematic diagram of the compos...

Embodiment 2

[0051] This embodiment provides a method for preparing a composite electrode with a low thermal expansion coefficient by using the sol-gel method, and the specific details are as follows:

[0052] S1: Preparation of a homogeneous nitrate solution

[0053] PrBaCo 2 o 5+δ @NdMnO 3 The stoichiometric ratio is dissolved in 200ml of deionized water, in which neodymium manganate and praseodymium barium cobalt are added according to the mass ratio of 3:7; heated at 90°C and stirred to gradually volatilize the water to obtain a jelly;

[0054] S2: Precursor preparation

[0055] Dry the jelly obtained in S1 in an oven at 250°C to form a fluffy precursor;

[0056] S3: Preparation of composite electrode powder

[0057] Sintering the precursor obtained in step S2 at a constant temperature of 1100° C. for 5 hours, further ball milling the sintered powder for 24 hours, and sieving to obtain a composite electrode powder;

[0058] S4: Press the composite electrode powder obtained in ste...

Embodiment 3

[0061] This embodiment provides a method for preparing a composite electrode with a low thermal expansion coefficient by using the sol-gel method, and the specific details are as follows:

[0062] S1: Preparation of a homogeneous nitrate solution

[0063] PrBaCo 2 o 5+δ @NdMnO 3 The stoichiometric ratio is dissolved in 200ml of deionized water, in which neodymium manganate and praseodymium barium cobalt are added according to the mass ratio of 1:9; heated to 85°C and stirred to gradually volatilize the water to obtain a jelly;

[0064] S2: Precursor preparation

[0065] Dry the jelly obtained in S1 in an oven at 250°C to obtain the precursor powder;

[0066] S3: Preparation of composite electrode powder

[0067] Sintering the precursor powder obtained in step S2 at a constant temperature of 1100°C for 5 hours, further ball milling the sintered powder for 24 hours, and sieving the powder below 200 mesh to obtain a composite electrode powder;

[0068] S4: Press the composi...

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Abstract

The invention provides a composite electrode material with a low thermal expansion coefficient and a preparation method and application thereof. The negative expansion coefficient component and the cobalt-based electrode component are compounded, the negative expansion effect of the negative expansion coefficient component in the thermal cycle process can play a role in buffering excessive expansion of the electrode, the expansion coefficient of the cobalt-based electrode component is effectively reduced, and therefore the electrode and electrolyte are combined more tightly, and the performance of the electrode is improved. And the performance and the cycling stability of the battery are further improved. The composite electrode provided by the invention effectively overcomes the existing problem of oxygen electrode cracking or falling caused by mismatching of thermal expansion, and has positive significance for promoting commercialized popularization of solid oxide fuel cells / electrolytic cells.

Description

technical field [0001] The invention relates to the technical field of fuel cells / electrolytic cells, in particular to a composite electrode material with a low thermal expansion coefficient, a preparation method and an application. Background technique [0002] Cobalt-based electrode materials have high oxygen catalytic activity and are currently the most widely used electrode materials in solid oxide fuel cells (SOFC) and electrolytic cells (SOEC), such as lanthanum strontium cobalt (LSC), praseodymium barium cobalt (PBC) , Gadolinium Barium Cobalt (GBC) and Neodymium Barium Cobalt (NBC) and so on. Although cobalt-based electrode materials have excellent electrocatalytic performance, the change of the spin state of cobalt ions will lead to a large thermal expansion coefficient of such materials, usually greater than 20×10 -6 k -1 , while common electrolyte components such as yttria-stabilized zirconia (YSZ) and gadolinia-stabilized ceria (GDC) are usually 10×10 -6 k -1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90C25B11/042
CPCY02E60/50
Inventor 李大钧雷泽靳现林王浩然周卫华杨志宾刘明先彭苏萍
Owner SHENHUA NEW ENERGY CO LTD