Method for preparing (Mn, Co) 3O4-Li2O coating through liquid phase sintering and application

A liquid phase sintering and coating technology, applied in structural parts, fuel cells, electrical components, etc., can solve the problems of increasing the preparation cost of protective coatings and the complexity of the preparation process, achieve good oxidation resistance, prevent vaporization and migration, Good electrical conductivity

Pending Publication Date: 2022-04-05
SHENHUA NEW ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a higher pre-reduction temperature increases the preparation cost and complexity of the preparation process of the protective coating.

Method used

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  • Method for preparing (Mn, Co) 3O4-Li2O coating through liquid phase sintering and application
  • Method for preparing (Mn, Co) 3O4-Li2O coating through liquid phase sintering and application
  • Method for preparing (Mn, Co) 3O4-Li2O coating through liquid phase sintering and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This embodiment provides a liquid phase sintering preparation (Mn, Co) 3 o 4 -Li 2 The method of O coating, the specific details are as follows:

[0065] S1: Based on the total molar percentage of the ingredients as 100%, the (Mn, Co) 3 o 4 Powder, LiNO 3 The ratio of metal atoms Mn / Co:Li is 95:5 and mixed evenly, using ethanol as solvent, heating, stirring and evaporating on a magnetic stirrer at 70°C, and then drying to obtain mixed powder.

[0066] S2: The mixed powder was oxidized and sintered at 600°C for 2 hours, ground in a mortar and sieved, and the (Mn,Co) 3 o 4 -Li 2 O powder and screen printing glue are mixed at a mass ratio of 10:8 and ground evenly.

[0067] S3: Screen printing (Mn, Co) on the metal connector substrate SUS 430 after sandblasting 3 o 4 -Li 2 O coating, dried in an oven at 80 °C to obtain an intermediate coating.

[0068] S4: 4% H at 900°C after the intermediate coating 2 +96%N 2 Pre-reduction in atmosphere for 24 hours, and oxida...

Embodiment 2

[0072] This embodiment provides a liquid phase sintering preparation (Mn, Co) 3 o 4 -Li 2 The method of O coating, the specific details are as follows:

[0073] S1: Based on the total molar percentage of the ingredients as 100%, the (Mn, Co) 3 o 4 Powder, LiNO 3 Mix uniformly according to the metal atom Mn / Co:Li ratio of 90:10, use ethanol as solvent, heat, stir and evaporate on a magnetic stirrer at 70°C, then dry to obtain a mixed powder.

[0074] S2: The mixed powder was calcined at 600°C for 2 hours, ground in a mortar and sieved with 200 mesh, and the (Mn,Co) 3 o 4 -Li 2 O powder and screen printing glue are mixed at a mass ratio of 10:8 and ground evenly.

[0075] S3: Screen printing (Mn, Co) on the metal connector substrate SUS 430 after sandblasting 3 o 4 -Li 2 O coating, dried in an oven at 80 °C to obtain an intermediate coating.

[0076] S4: 4% H at 900°C after the intermediate coating 2 +96%N 2 Pre-reduction in atmosphere for 24 hours, and oxidation i...

Embodiment 3

[0080] This embodiment provides a liquid phase sintering preparation (Mn, Co) 3 o 4 -Li 2 The method of O coating, the specific details are as follows:

[0081] S1: Based on the total molar percentage of the ingredients as 100%, the (Mn, Co) 3 o 4 Powder, LiNO 3 The ratio of metal atoms Mn / Co: Li is 98.5:1.5 and mixed evenly, using ethanol as solvent, heating, stirring and evaporating on a magnetic stirrer at 70°C, and then drying to obtain mixed powder.

[0082] S2: Calcinate the mixed powder at 600°C for 2h, grind it in a mortar and sieve it, and mix the (Mn,Co) 3 o 4 -Li 2 O powder and screen printing glue are mixed at a mass ratio of 10:8 and ground evenly.

[0083] S3: Screen printing (Mn, Co) on the metal connector substrate SUS 430 after sandblasting 3 o 4 -Li 2 O coating, dried in an oven at 80 °C to obtain an intermediate coating.

[0084] S4: 4% H at 900°C after the intermediate coating 2 +96%N 2 Pre-reduction in atmosphere for 24 hours, and oxidation i...

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Abstract

The invention provides a method for preparing a (Mn, Co) 3O4-Li2O spinel coating through liquid phase sintering and application of the (Mn, Co) 3O4-Li2O spinel coating. According to the method, through liquid phase sintering, the densification pre-reduction temperature of the (Mn, Co) 3O4 coating is reduced by adding low-melting-point metal salt LiNO3; according to the method, the coating sintering process of pre-reduction and re-oxidation is adopted, the microstructure of an original material can be rearranged in the sintering process to form new nano particles, particle distribution is more uniform, the uniform microstructure has high hindering capacity on overgrowth of crystal grains, and the oxidation resistance of the coating can be improved.

Description

technical field [0001] The invention relates to the technical field of electrode coatings, in particular to a liquid-phase sintering preparation (Mn, Co) 3 o 4 -Li 2 O-coating methods and applications. Background technique [0002] A solid oxide fuel cell (SOFC) is an efficient and clean power generation device that directly converts the chemical energy of fuel into electrical energy. In the actual application process, a connector is used to connect multiple single battery cells to obtain a battery stack with higher voltage and power. As the operating temperature of fuel cells drops to 600-800°C, metal connectors can replace traditional ceramic connectors. [0003] Among metal connectors, Fe-Cr-based alloys have the advantages of good thermal conductivity, thermal expansion coefficient (CTE) matching with other battery components, and good oxidation resistance. However, due to the Cr element contained in the metal connector, at the operating temperature of the SOFC, in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M8/1246
CPCY02E60/50
Inventor 吕迎晨李大钧杨志宾靳现林葛奔周卫华彭苏萍刘明先
Owner SHENHUA NEW ENERGY CO LTD
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