Lithium-sodium-cobalt-oxygen thermoelectric ceramic and preparation method thereof

A sodium cobalt oxygen and thermoelectric technology, applied in the field of lithium sodium cobalt oxygen thermoelectric ceramics and its preparation

Inactive Publication Date: 2009-08-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of applied indicators, the Seebeck coefficient and quality factor of the currently developed layered cobaltate still need to be further improved

Method used

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  • Lithium-sodium-cobalt-oxygen thermoelectric ceramic and preparation method thereof
  • Lithium-sodium-cobalt-oxygen thermoelectric ceramic and preparation method thereof
  • Lithium-sodium-cobalt-oxygen thermoelectric ceramic and preparation method thereof

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Effect test

Embodiment 1

[0016] 1) Lithium carbonate (Li carbonate with a purity higher than 99%) 2 CO 3 ): sodium carbonate (Na 2 CO 3 ): cobalt tetroxide (Co 3 o 4 )=0.72:0.675:1 molar ratio proportioning Weigh raw materials and evenly mix, grind, carry out punching and pressing under the pressure of 100MPa to obtain compressed tablet then;

[0017] 2) Put the above-mentioned compressed tablet in a tube furnace with flowing oxygen, rapidly heat up to the calcination temperature, the calcination temperature is 1173K, and the calcination time is 30 hours, and then rapidly cool to room temperature to obtain Li 0.48 Na 0.45 CoO 2 blocks.

[0018] From figure 1 It can be seen that the lithium sodium cobalt oxide obtained by the above process has good single-phase property, and all X-ray diffraction peaks can be used as good indicators. The unit cell parameters of the sample are shown in Table 1; from figure 2 It can be seen that the synthesized lithium sodium cobalt oxide ceramics have good the...

Embodiment 2

[0020] 1) will Li 2 CO 3 :Na 2 CO 3 :Co 3 o 4 Raw materials with a molar ratio of 0.675:0.525:1 are fully mixed, ground, and then punched under a pressure of 80 MPa to obtain compressed tablets;

[0021] 2) Put the above-mentioned compressed tablet in a tube furnace with flowing oxygen, rapidly heat up to the calcination temperature, the calcination temperature is 1173K, and the calcination time is 24 hours, and then rapidly cool to room temperature to obtain Li 0.45 Na 0.35 CoO 2 blocks.

Embodiment 3

[0023] 1) will Li 2 CO 3 :Na 2 CO 3 :Co 3 o 4 Raw materials with a molar ratio of 0.6375:0.4875:1 are fully mixed, ground, and then punched under a pressure of 100 MPa to obtain compressed tablets;

[0024] 2) Put the above-mentioned compressed tablet in a tube furnace with flowing oxygen, rapidly heat up to the calcination temperature, the calcination temperature is 1153K, the calcination time is 36 hours, and then rapidly cool to room temperature. 0.425 Na 0.3255 CoO 2 blocks.

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Abstract

The invention relates to a lithium sodium cobalt oxygen thermoelectric ceramic and a preparation method thereof. The general formula of the cobaltate thermoelectric porcelain is LixNayCoO2, in which the contents of lithium and sodium are respectively 0.375≤x≤0.48 and 0.3≤y≤0.45; the raw materials with a molar ratio of Li2CO3:Na2CO3:Co3O4 of 3x:3y:2 are fully mixed , ground, and then punched under a pressure of 80-120 MPa to obtain compressed tablets, wherein, 0.375≤x≤0.48, 0.3≤y≤0.45; the compressed tablets were calcined in a tube furnace with flowing oxygen for 24-48 hours, calcined The temperature is 1103-1173K, and then rapidly cooled to room temperature to obtain a single-phase polycrystalline block. The invention shows that lithium sodium cobalt oxide can be used as a novel thermoelectric material. The preparation of the material is realized by changing the composition of the initial reactant, the sintering atmosphere, the sintering temperature, the sintering time and the method of rapid cooling. The material has a large thermoelectric coefficient (170-210 μV / K) near room temperature, and its quality factor is higher than that of similar cobaltate thermoelectric ceramics, so it has application prospects.

Description

technical field [0001] The invention relates to a lithium sodium cobalt oxygen thermoelectric ceramic and a preparation method thereof. Background technique [0002] Thermoelectric materials have significant Seebeck effect and Peltier effect, so they can realize direct conversion between thermal energy and electrical energy. The Seebeck effect is a thermoelectric effect, which means that when there is a certain temperature difference between the two ends of the material, a certain electromotive force will be generated. The Peltier effect is the inverse effect of the Seebeck effect: when a current in a certain direction is passed through the material, heat absorption and heat release will occur at both ends of the material; if the direction of the current is changed, the heat absorption and heat release ends will also be reversed. . Utilizing this Seebeck effect, thermoelectric materials are not only the most important energy supply in the field of deep space exploration, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/32C04B35/622
Inventor 曹光旱任之陈晓阳蒋帅许祝安
Owner ZHEJIANG UNIV
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