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Sealing material for sodium-sulfur cell and preparation thereof

A technology of sealing materials and sodium-sulfur batteries, which is applied in the field of energy materials, can solve problems such as poor thermal shock resistance and mismatching expansion coefficients, and achieve good thermal shock resistance and excellent matching effects

Inactive Publication Date: 2009-06-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to prepare and optimize a glass-ceramic sealing material for sodium-sulfur batteries, so that it can overcome defects such as mismatched expansion coefficients and poor thermal shock resistance during glass sealing.

Method used

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  • Sealing material for sodium-sulfur cell and preparation thereof
  • Sealing material for sodium-sulfur cell and preparation thereof
  • Sealing material for sodium-sulfur cell and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] SiO 2 , Al 2 o 3 , H 3 BO 3 , Na 2 CO 3 , K 2 CO 3 ,TiO 2 , Y 2 o 3 The ingredients are designed according to the ratio of G1 in Table 1. All ingredients are analytically pure. They are ball milled in alcohol medium for 4 hours, dried, kept at 800°C for 0.5h, melted at 1400°C for 2h, poured into ice water and quenched to obtain Glass slag, glass powder obtained after ball milling. Pass through a 200-mesh sieve, add 2% PVB as a binding agent, and press into a rectangular strip of 6×6×27 mm by a tablet press. Insulate at 600°C for 2 hours to remove the binder, according to image 3 The sealing system is sealed, the sealing temperature is raised to 1000°C at 4°C / min, held for 15 minutes, lowered to the nucleation temperature of 600°C, held for 240 minutes, raised to the crystallization temperature of 850°C, held for 240 minutes. The final sealed glass-ceramic is obtained. The thermal expansion coefficient was measured with a thermal dilatometer, and the heati...

Embodiment 2

[0025] SiO 2 , Al 2 o 3 , H 3 BO 3 , Na 2 CO 3 , K 2 CO 3 ,TiO 2 , Y 2 o 3 The ingredients are designed according to the ratio of G2 in Table 1. All ingredients are analytically pure. They are ball milled in alcohol medium for 4 hours, dried, kept at 800°C for 0.5h, melted at 1400°C for 2h, poured into ice water and quenched to obtain Glass slag, glass powder obtained after ball milling. Pass through a 40-mesh sieve, add 2% PVB as a binding agent, and press into a rectangular strip of 6×6×27 mm by a tablet press. Insulate at 600°C for 2 hours to remove the binder, according to image 3 The sealing system is sealed, the sealing temperature is 1000°C, the sealing time is 15min, the nucleation is 240min at 700°C, the crystallization temperature is raised to 800°C, and the heat preservation is 400min. The final sealed glass-ceramic is obtained. The thermal expansion coefficient was measured with a thermal dilatometer, and the heating rate was 5°C / min. The thermal ex...

Embodiment 3

[0027] SiO 2 , Al 2 o 3 , H 3 BO 3 , Na 2 CO 3 , K 2 CO 3 ,TiO 2 , Y 2 o 3 The ingredients are designed according to the ratio of G3 in Table 1. All ingredients are analytically pure. They are ball milled in alcohol medium for 4 hours, dried, kept at 800°C for 0.5h, melted at 1400°C for 2h, poured into ice water and quenched to obtain Glass slag, glass powder obtained after ball milling. Pass through a 60-mesh sieve, add 2% PVB as a binding agent, and press into a rectangular strip of 6×6×27 mm by a tablet press. Insulate at 600°C for 2 hours to remove the binder, according to image 3 The sealing system is sealed, the sealing temperature is 1000°C, the sealing time is 15min, the nucleation is 240min at 700°C, the crystallization temperature is raised to 800°C, and the heat preservation is 400min. The final sealed glass-ceramic is obtained. The thermal expansion coefficient was measured with a thermal dilatometer, and the heating rate was 5°C / min. The thermal ex...

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Abstract

The invention relates to a sealing material for a sodium-sulfur cell and a preparation method thereof, in particular to a beta-Al2O3 ceramic and alpha-Al2O3 ceramic sealing material and a preparation method thereof. The invention belongs to the field of energy source material. The sealing material for the sodium-sulfur cell is characterized in that the sealing material is glass powder which comprises the following components: 20 to 90 weight percent of SiO2, 5 to 40 weight percent of B2O3, 0 to 10 weight percent of Al2O3 and the balance being R2O; R2O can be one or more of Na2O, K2O and Li2O; the sealing material also comprises the following components counted by the weight of all the oxides: 0.5 to 6 weight percent of TiO2 and 0 to 6 weight percent of Y2O3 or CeO2 or La2O3; all raw materials are smelted for 30 to 360 minutes at the high temperature of 1,400 to 1,600 DEG C; and the glass powder is obtained after water quenching and crushing. The sealing material solves the problem of the imperfect heat matching between the borosilicate sealing glass for the sodium-sulfur cell and the beta-Al2O3 ceramics and alpha-Al2O3 ceramics. The sealing body has good resistance to thermal shocks; and after 50 thermal shocks, the sealing body can still not be broken off by hands and can not be fractured and have no micro-cracks when the sealing body is freely dropped onto the cement floor from a 2-meter high position.

Description

technical field [0001] The invention relates to a sealing material for a sodium-sulfur battery and a preparation method thereof, in particular to beta-Al 2 o 3 Ceramics and alpha—Al 2 o 3 A ceramic sealing material and a preparation method thereof belong to the field of energy materials. technical background [0002] Sodium-sulfur battery is a kind of sodium ion conductor beta-Al 2 o 3 A new type of high-energy storage battery with a solid electrolyte, sodium and sulfur as the negative electrode and the positive electrode, was first invented and published by the Ford Company of the United States in 1967. In the past nearly 40 years, sodium-sulfur batteries, as an advanced high-energy-density secondary battery, have received great attention internationally, and significant progress has been made in research and development. At present, it is moving towards practical and commercialization. [0003] Battery sealing is a very important technical link in the manufacturing ...

Claims

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Application Information

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IPC IPC(8): C03C8/24
Inventor 温兆银宋树丰张群喜刘宇韩金铎吴相伟曹佳第黄颖
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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