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Surface modifying method for porous Ni-base cathode material in fusion carbonate fuel battery

A molten carbonate and fuel cell technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of cracking ceramic materials, aggravating materials, and long time, so as to improve strength and toughness, uniform film thickness, The effect of increasing the number of grain boundaries

Inactive Publication Date: 2003-02-12
XIAMEN UNIV
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, there are several deficiencies in this technology: 1) The deformation of the material under load is not considered. Experiments show that the Ni matrix cathode after sol infiltration still has obvious deformation, accompanied by a considerable amount of nickel dissolution.
The cracking phenomenon will cause LiCoO 2 The uneven distribution on the Ni matrix eventually aggravates the local destruction and dissolution of the material under load
2) There is still a considerable gap in practical industrialization
However, the area of ​​the electrode material used in the actual MCFC process is generally 1m×1.25m or larger, but its thickness is only about 1mm. If such a large and thin material is fully ceramicized, its brittleness will bring inconvenience to the installation operation. The load generated by the stacking of single cells can also easily cause the rupture of the ceramic material, resulting in premature failure of the material
In addition, the sol infiltration time is too long (about 24h), which is not conducive to large-scale industrial production

Method used

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  • Surface modifying method for porous Ni-base cathode material in fusion carbonate fuel battery
  • Surface modifying method for porous Ni-base cathode material in fusion carbonate fuel battery
  • Surface modifying method for porous Ni-base cathode material in fusion carbonate fuel battery

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Take 1.725gLiNO 3 and 7.725gCo(NO 3 ) 2 ·6H 2 O mixed and dissolved in deionized water, the resulting solution was mixed with 1.2ml polyacrylic acid (PAA) and the volume was adjusted to 200ml, and HNO was added dropwise under stirring 3 , adjust the pH value to 1.5 and continue to stir for 40min. The synthesis solution was hydrolyzed at 75° C. and evaporated for 24 hours to obtain a pink sol (sol). The temperature was kept constant, and the solution was stirred to continue to remove water to obtain a pink gel (gel) precursor. After the gel was dried, it was pre-calcined at 300°C for 1 h to remove organic matter, and then calcined at 650°C for 1.5 h to obtain LiCoO 2 Nano powder. XRD and TEM test results show that LiCoO 2 The powder composition is simple, the crystallinity is good, and the particle size is 50-70nm.

[0020] Take 0.1g LiCoO 2 Nanopowder, dispersed by ultrasound in 25ml isopropanol to make a suspension, with HNO 3 Adjust the pH to 4.38. At room t...

Embodiment 2

[0025] LiCoO 2 The preparation of nanopowder is the same as embodiment 1, take LiCoO 2 Disperse 0.1g of nano powder in 25ml of acetylacetone to make a suspension, adjust the pH value to 2.50, at room temperature, use a porous Ni material with a thickness of 1.066mm and a porosity of 73.7% as the cathode, and the platinum electrode as the anode. 2 Electrophoretic deposition in suspension, the electrophoretic deposition conditions are voltage 150V, current 8mA, and the deposition time is 1min on both sides of the material. 2 Calcined in atmosphere for 3h to get Ni-LiCoO 2 composite material. at 470°C and CO 2 :O 2 :N 2 In a mixed atmosphere of 0.20:0.15:0.65, against Ni-LiCoO in molten carbonate 2 The composite material was pre-oxidized in situ for 10 h.

[0026] Figure 5 The curves in each represent porous Ni(a), LiCoO 2 -Ni composite (b) and Ni-LiCoO after pre-oxidation 2 Composites (c) in molten carbonate and (CO 2 +O 2 +N 2 ) in a mixed atmosphere at 923K and 3...

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Abstract

A process for modifying the surface of multi-porous Ni-base material as the cathode for fuel battery of fused carbonate includes such steps as preparing LiCoO2 nanometre powder by the sol-gel method, modifying the multi porous Ni-base material with LiCoO2 Nanometre powder by the electrophoretic deposition method, and calcining at 100-650 deg.C. Its advantages are high strength and toughness, high uniformity of LiCoO2, and long service life.

Description

(1) Technical field [0001] The invention relates to a method for surface modification of porous nickel-based cathode materials in molten carbonate fuel cells. (2) Technical background [0002] Fuel cell power generation is the fourth type of power generation technology after hydropower, thermal power and nuclear power generation. A fuel cell is a highly efficient device that converts chemical energy into electrical energy. It has the advantages of high power generation efficiency, less environmental pollution, short plant construction time, good load reduction flexibility, and easy comprehensive utilization of waste heat. Among them, the power generation efficiency of molten carbonate fuel cell (MCFC) is higher than that of phosphate fuel cell (PAFC) and solid oxide fuel cell (SOFC). . However, alkali metals at high temperatures are highly corrosive, resulting in a reduction in material and battery life. Among them, the dissolution of the nickel oxide cathode and the short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00H01M4/88
CPCY02E60/50
Inventor 林昌健陈丽江左娟
Owner XIAMEN UNIV
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