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Method for performing in-situ polymerization on surfaces of yttria-stabilized zirconia (YSZ) particles to obtain water system tape-casting slurry with high solid content by adopting initiator

A particle surface, in-situ polymerization technology, applied in the direction of solid electrolyte fuel cells, final product manufacturing, sustainable manufacturing/processing, etc., to achieve the effect of low cost and simple process

Inactive Publication Date: 2011-09-07
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no commercial dispersant that can be applied to micron, submicron and nanometer YSZ powders at the same time

Method used

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  • Method for performing in-situ polymerization on surfaces of yttria-stabilized zirconia (YSZ) particles to obtain water system tape-casting slurry with high solid content by adopting initiator
  • Method for performing in-situ polymerization on surfaces of yttria-stabilized zirconia (YSZ) particles to obtain water system tape-casting slurry with high solid content by adopting initiator
  • Method for performing in-situ polymerization on surfaces of yttria-stabilized zirconia (YSZ) particles to obtain water system tape-casting slurry with high solid content by adopting initiator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 prepares large-area, dense YSZ electrolyte diaphragm

[0030] Take YSZ (8mol%Y 2 o 3 Stable ZrO 2 ) powder 100g, acrylic acid monomer 0.5g, ammonium persulfate 0.04g, sodium metabisulfite 1g and water 200g were put into the reactor, fully stirred evenly, and surface polymerization was carried out at a constant temperature of 40°C for 6 hours. The surface-polymerized YSZ powder is centrifuged, washed with water, and centrifuged again. Composite binder 5g, plasticizer polyethylene glycol 0.7g, water 20g made of the washed surface-polymerized YSZ powder and polyvinyl alcohol (mass ratio 50%)-B1070 latex (mass ratio 50%) Put it into a ball mill jar and mill it for 24 hours; add an appropriate defoamer to the electrolyte slurry obtained after ball milling, vacuumize it for 10 minutes, cast it on a casting machine with a knife height of 300 μm, and dry it at room temperature for 24 hours. Release the mold to make a rollable and tailorable electrolyte biscuit ...

Embodiment 2

[0031] Example 2 Preparation of large-area anode-supported / thin-layer YSZ electrolyte composite membrane

[0032] Take YSZ (8mol% Y 2 o 3 Stable ZrO 2) powder 100g, acrylic acid monomer 0.5g, ammonium persulfate 0.02g, sodium metabisulfite 1g and water 200g were put into the reactor, fully stirred evenly, and surface polymerization was carried out at a constant temperature of 40°C for a reaction time of 6h. The surface-polymerized YSZ powder is centrifuged, washed with water, and centrifuged again. Composite binder binder 5g, plasticizer polyethylene glycol 0.7g made of the washed surface-polymerized YSZ powder and polyvinyl alcohol (mass ratio 50%)-B1070 latex (mass ratio 50%) 1. Put 20g of water into a ball mill jar and mill for 24 hours; add an appropriate defoamer to the electrolyte slurry obtained after ball milling, vacuumize for 10 minutes, cast on a tape casting machine with a knife height of 120 μm, and dry at room temperature for 24 hours After that, the mold can...

Embodiment 3

[0035] Example 3 Preparation of large-area anode-supported / thin-layer ScSZ electrolyte composite membrane

[0036] Take ScSZ (8mol%Sc 2 o 3 Stable ZrO 2 ) powder 100g, acrylic acid monomer 0.5g, ammonium persulfate 0.04g, sodium metabisulfite 2g and water 200g were put into the reactor, fully stirred evenly, and surface polymerization was carried out at a constant temperature of 50°C for a reaction time of 3h. The surface-polymerized ScSZ powder is centrifuged, washed with water, and centrifuged again. Composite binder binder 5g composed of washed surface-polymerized yttria-stabilized zirconia powder (YSZ) powder and polyvinyl alcohol (50% by mass)-B1070 latex (50% by mass) , plasticizer polyethylene glycol 0.7g, water 20g are put into the ball mill tank and ball milled for 24 hours; Add appropriate defoamer to the electrolyte slurry obtained after ball milling, vacuumize for 7 minutes, and put it on the casting machine with knife height 130μm tape casting, after drying at...

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Abstract

The invention discloses a method for performing in-situ polymerization on surfaces of yttria-stabilized zirconia (YSZ) particles to obtain water system tape-casting slurry with high solid content by adopting an initiator. The invention relates to a method for preparing YSZ slurry with high solid content on surfaces of YSZ particles by adopting an in-situ polymerization dispersion mode. The method comprises the following steps: in the presence of the initiator, polymerizing acrylic monomer molecules adsorbed on the surfaces of the YSZ particles along the surfaces of YSZ particles, wherein the polymer on the surface of one particle has no excess chain and chain end to be subjected to bridging and flocculation together with the adjacent particles; and preparing the YSZ particles after surface polymerization, binder, plasticizer and solvent at a certain ratio to form the stable and evenly dispersed tape-casting slurry with high solid content (66vol%). The YSZ slurry prepared by the method has not only high solid content, but also higher uniformity and stability than those of the YSZ slurry prepared by using commercial dispersant. The method has the advantages of simple process, low cost and suitability for industrial production; the relative density of the prepared electrolyte is more than 97.8%, the thickness can be controlled at 8-20mu m; and the single solid oxide fuel cell (SOFC) formed by the tape-casting slurry has good electrocatalytic performance.

Description

technical field [0001] The invention relates to a method for preparing a stable, uniformly dispersed YSZ cast slurry with high solid phase content and a thin-layer electrolyte thereof by adopting acrylic acid in-situ polymerization dispersion method on the surface of micron-scale, sub-micron-scale and nano-scale YSZ particles. The invention belongs to the field of planar solid oxide fuel cell (SOFC). Background technique [0002] One of the most promising fuel cells is the solid oxide fuel cell (SOFC). In recent years, major industrial countries in the world have invested huge sums of money in the research and development of SOFC's key materials, processes and system integration and have made significant progress. Flat-plate SOFCs usually have high current density and power density per unit volume, which can effectively reduce the preparation cost per unit power. The electrolyte material of solid oxide fuel cells generally uses yttria-stabilized zirconia (YSZ) as a raw mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628C04B35/48H01M8/12
CPCY02E60/522Y02E60/525Y02E60/50Y02P70/50
Inventor 吴也凡苏蕙
Owner JINGDEZHEN CERAMIC INSTITUTE