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Multilayer composite [beta]"-Al2O3 flat-plate-type solid electrolyte and preparation method thereof

A solid electrolyte and multi-layer composite technology, which is applied in circuits, electrical components, secondary batteries, etc., can solve the problems of low ion flux, limitation of tube diameter and tube length, low production efficiency, etc., and achieve mature and stable technology and equipment Simple, productive results

Inactive Publication Date: 2014-10-15
CHENGDU WISEDONE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ion flux of the solid electrolyte is inversely proportional to the thickness of the solid electrolyte. The greater the thickness of the solid electrolyte, the lower the ion flux, which will reduce the energy density of the sodium-sulfur battery, and the actual energy density is below 150W h / kg , far lower than the theoretical energy density of 760W h / kg
At the same time, the preparation process of solid electrolyte with tubular structure is complicated and the production efficiency is low; due to the influence of its preparation process, the diameter and length of the pipe are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh the β”-Al which accounts for 15vol% of the total amount according to the formula 2 o 3 Ceramic powder, 65% vol ethanol / water azeotropic solvent (the ratio of ethanol: water is 95:5 (wt%)), 5% vol triethyl phosphate. According to the formula, take the β”-Al which accounts for 25vol% of the total 2 o 3 Ceramic powder, 12vol% ammonium carbonate, 45%vol ethanol / water azeotropic solvent (the ratio of ethanol: water is 95:5 (wt%)), 5%vol triethyl phosphate. The weighed raw materials were poured into nylon ball mill jars for ball milling once, the ball-to-material ratio was 2:1, the rotational speed was 400 rpm, and the ball milling time was 12 hours. After the first ball milling, 10vol% polyvinyl alcohol, 5vol% glycerin and 8vol% polyvinyl alcohol, 5vol% glycerin were respectively added to the ball milling tank, and ball milled again for 4 hours to obtain a stable casting slurry. The obtained casting slurry was degassed under the vacuum condition of -0.01MPa for 2h....

Embodiment 2

[0039] Weigh 25vol% of the total amount of β”-Al according to the formula 2 o 3 Ceramic powder, 50vol% ethanol / toluene azeotropic solvent (the ratio of ethanol:toluene is 68:32 (wt%)), 10%vol herring oil. Weigh 20vol% of the total amount of β-Al according to the formula 2 o 3 Ceramic powder, 6vol% rice husk, 45vol% ethanol / toluene azeotropic solvent (the ratio of ethanol:toluene is 68:32 (wt%)), 10%vol herring oil. The weighed raw materials were poured into nylon ball mill jars for ball milling once, the ball-to-material ratio was 2:1, the rotational speed was 400 rpm, and the ball milling time was 24 hours. Add 10vol% polyvinyl butyral, 5vol% dibutyl phthalate, 12vol% polyvinyl butyral, 7vol% dibutyl phthalate to the ball mill tank after the first ball milling, and again After ball milling for 12 hours, a stable casting slurry was obtained. The resulting casting slurry was degassed for 4 h under a vacuum condition of -0.01 MPa. After the degassing is completed, the cast...

Embodiment 3

[0041] Weigh 20vol% of β”-Al according to the formula 2 o 3 Ceramic powder, 55% vol methyl ethyl ketone / methanol azeotropic solvent (the ratio of methyl ethyl ketone: methanol is 86:14 (wt%)), 3% vol glycerol trioleate. Weigh 20vol% of β”-Al according to the formula 2 o 3 Ceramic powder, 5vol% sawdust, 50% vol methyl ethyl ketone / methanol azeotropic solvent (the ratio of methyl ethyl ketone: methanol is 86:14 (wt%)), 5% vol glyceryl trioleate. The weighed raw materials were poured into nylon ball mill jars for ball milling once, the ball-to-material ratio was 2:1, the rotation speed was 400 rpm, and the ball milling time was 18 hours. Add 16vol% polyvinyl butyral, 6vol% diethylene glycol, 15vol% polyvinyl butyral, 5vol% diethylene glycol to the ball milling tank after the first ball milling, and ball mill again for 6 hours to obtain stable Casting slurry. The obtained casting slurry was degassed under the vacuum condition of -0.01MPa for 2h. After the degassing is comple...

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Abstract

The invention provides a multilayer composite [beta]"-Al2O3 flat-plate-type solid electrolyte and a preparation method thereof. A porous supporting layer, which is slightly thicker than a thin-wall solid electrolyte layer, is attached to the thin-wall solid electrolyte layer, wherein the porous supporting layer has an effect of reinforcement so that the solid electrolyte is prevented from cracking during usage and a safety performance of a sodium-sulfur battery is enhanced. Meanwhile, the supporting layer is in a porous structure, wherein pores provide channels for transportation of sodium ions, do not have an obvious blocking effect on the transportation of the sodium ions and not influent resistivity and ion flux, so that the multilayer composite [beta]"-Al2O3 flat-plate-type solid electrolyte, which is composed of a thin compact layer and a thick porous supporting layer, not only has a high ion flux but also has enough strength, thereby enabling a manufactured sodium-sulfur battery to be high in energy density and meanwhile safety to be not influenced.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a multilayer composite β"-Al 2 o 3 Flat plate solid electrolyte and preparation method thereof. Background technique [0002] The sodium-sulfur battery was first invented and published by the Ford company of the United States in 1967. It is a metal sodium as the negative electrode, sulfur as the positive electrode, β”-Al 2 o 3 The ceramic tube is a secondary battery with an electrolyte diaphragm. The excellent characteristics of the sodium-sulfur battery itself: high energy density, long operating life, green and pollution-free, low maintenance cost, outstanding overload pulse power output characteristics and rapid dynamic characteristics, etc., make it have great potential in energy storage systems, power systems and other fields. Broad application prospects. Nowadays, sodium-sulfur batteries have been successfully used in peak shaving, emergency power supply, wind powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622H01M10/39
CPCY02E60/10
Inventor 惠志锋
Owner CHENGDU WISEDONE TECH
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