Preparation method of novel negative electrode contact material for solid oxide fuel cell

A solid oxide and fuel cell technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve the problems of long-term stability and thermal cycle stability not guaranteed, high cost of precious metals, large usage of contact materials, etc. problem, to achieve the effect of good thermal cycle stability

Inactive Publication Date: 2017-05-10
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large-area single cells, the use of contact materials is very large, and the cost of precious metals is high. When using ceramic powder materials with simple structure and low price, their long-term stability and thermal cycle stability cannot be guaranteed.

Method used

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  • Preparation method of novel negative electrode contact material for solid oxide fuel cell
  • Preparation method of novel negative electrode contact material for solid oxide fuel cell
  • Preparation method of novel negative electrode contact material for solid oxide fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The preparation method of the novel cathode contact material of the solid oxide fuel cell of the present invention comprises the following steps:

[0032] Step 1, be 5: 3: 2 to get La(NO) according to the metal ion mol ratio 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Ni (NO 3 ) 2 ·6H 2 O mixes to obtain metal nitrate;

[0033] Step 2, take PVA, make the molar ratio of PVA hydroxyl and all metal cations of metal nitrate in step 1 to be 1:4, mix PVA with distilled water to prepare a PVA aqueous solution with a mass fraction of 5%, heat the PVA aqueous solution and stir to PVA The aqueous solution is completely clarified; the storage container of the prepared PVA aqueous solution with a mass fraction of 5% is sealed to prevent water evaporation; the PVA aqueous solution is heated and stirred until the PVA aqueous solution is completely clarified. After it is fully swollen, adjust the temperature of the oil bath to 95°C, and continue to stir until it is completely clear; ...

Embodiment 2

[0038] The preparation method of the novel cathode contact material of the solid oxide fuel cell of the present invention comprises the following steps:

[0039] Step 1. Take La(NO) according to the molar ratio of metal ions as 5:3:2 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Ni (NO 3 ) 2 ·6H 2 O mixes to obtain metal nitrate;

[0040] Step 2, take PVA, make the molar ratio of PVA hydroxyl and all metal cations of metal nitrate in step 1 to be 1:4, mix PVA with distilled water to prepare a PVA aqueous solution with a mass fraction of 5%, heat the PVA aqueous solution and stir to PVA The aqueous solution is completely clarified; the prepared PVA aqueous solution with a mass fraction of 5% is covered with plastic wrap to prevent water evaporation; the process of heating and stirring the PVA aqueous solution until the PVA aqueous solution is completely clarified is the process of heating and stirring the PVA aqueous solution at 45 °C for 1 hour. , adjust the oil bath temperature ...

Embodiment 3

[0045] XRF analysis was performed on the coarse powder (1100 ℃ LCN) of the new cathode contact material for solid oxide fuel cells prepared in Example 1 and the fine powder (800 ℃ LCN) for the new cathode contact material for solid oxide fuel cells prepared in Example 1, and the powders were obtained. The chemical element ratios of La, Co, and Ni are shown in Table 1. X-ray diffraction analysis was performed on the two LCN powders, and the results were as follows figure 1 shown.

[0046] Table 3 Chemical element ratio in LCN powder

[0047]

[0048] Depend on figure 1 It can be seen that the powders obtained after holding at 800 °C and 1100 °C for 3 hours are all pure LCN powders. From the main diffraction peaks, it can be seen that the crystal structure of pure LCN belongs to the hexagonal crystal system. LCN still maintains a stable phase structure after being treated at a high temperature of 1100° C. and does not decompose, indicating that the LCN powder prepared by t...

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Abstract

The invention discloses a preparation method of a novel negative electrode contact material for a solid oxide fuel cell. A novel negative electrode contact layer is designed according to different physicochemical properties of the same LCN powder at different temperatures, and the respective advantages of coarse powder and fine powder are brought into full played, so that the negative electrode contact layer has high thermal cycling stability. The average performance attenuation rate of a single cell taking the combination of the coarse powder and the fine powder as the negative electrode contact layer in each thermal cycle is 0.46 percent, being far lower than the standard value of 1 percent. The single cell having the negative electrode contact layer is higher than the conventional single cell having a negative electrode contact layer prepared from pure coarse powder and pure fine powder on the aspect of thermal cycling stability.

Description

technical field [0001] The invention relates to a preparation method of a novel cathode contact material of a solid oxide fuel cell. Background technique [0002] With the rapid development of medium and low temperature solid oxide fuel cells (Solid Oxide Fuel Cell, SOFC for short), the material selection and preparation process of each component of the battery have been very mature, and the working requirements for medium and low temperature SOFC are also getting higher and higher. Many scholars and research groups are studying the long-term stability and thermal cycle stability of batteries and stacks, and put forward requirements for high power density, long-term stability and thermal cycle stability for batteries and stacks. Seek cost reduction and simplification and commercialization of operations. The cathode contact layer and the cathode functional layer are the two most critical components in the battery. The cathode contact layer restricts the current collection pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/10
CPCH01M4/8652H01M4/8657H01M4/88H01M8/10Y02E60/50
Inventor 李箭姚巍蒲健池波贾礼超颜冬
Owner HUAZHONG UNIV OF SCI & TECH
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