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Compatibility Study of Interface between Na~+ Conductive Ceramic and Na

Author: NiLeiLei
Tutor: YangZuoGuo;ZengLeCai
School: East China University of Science and Technology
Course: Chemical Engineering
Keywords: β〃-Al2O3 Solid electrolyte Conduction mechanism AC impedance spectroscopy
CLC: TQ174.1
Type: Master's thesis
Year: 2012
Downloads: 77
Quote: 0
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Abstract


Sodium sulfur battery was an advanced, environment friendly battery energy storage system. It was relatively new in power grid storage application. In general, electric energy storage was widely used in smart grid and new energy. Sodium sulfur battery, owing to its unique features which can be used as the backbone, to taking on more storage targets.β"-Al2O3, a key material in Na/S battery, was found to be an excellent solid electrolyte. It was a Na+ ion conductive ceramics, also a fast ion conductor. As a critical component,β-Al2O3 solid electrolyte was very important to the NAS battery. It played an important role in safety and application.To improving the electrical properties ofβ"-Al2O3 solid electrolyte, the purpose of this paper, following researches were carried out to solve problems like this. The mean purpose was designing and building a test platform, which can be efficiently used to testing the conductivity of P"-Al2O3 solid electrolyte, choosing electrochemical impedance spectroscopy (EIS) and then doing some researches, studying the ion conduction between the interface of P"-Al2O3 and metal Na+. It was mean to reveal the Na+ ion conduction mechanism inβ"-Al2O3 solid electrolyte. Three separate effects such as ionic transfer polarization, diffusion polarization, charging of the diffuse layer had been revealed.A solid state reaction method was applied to synthesize Na-beta-alumina powders. Comparing to the conductive silver electrode, we first designed a new electrode, adsorbed mixed molten salt of carbon, as the test electrode. Silver wires were used as the electrode lead, and then electrochemical impedance spectroscopy system studied the impedance of the half-cell. As a matter of fact, the charge transfer at an electrochemical interface betweenβ"-Al2O3 solid electrolyte and metal Na+ coupled elementary phenomena.In addition to the EIS techniques, it had showed that the contact resistance of interface betweenβ"-Al2O3 solid electrode and electrolyte played an effect to the test results. However, It had to minimize the effects of the contact resistance problems caused by measurement. And then, shell resistance impedance of system impedance, the electrode lead for measurements, such as the length of wire, cross-sectional area resistance, more or less affected the results. Interfacial polarization resistance of sodium ions involved in the migration rate. Among the temperature range, with the temperature increase, ionic conductivity of theβ"-Al2O3 solid electrolyte increased.This, therefore, was the research of the conductivity ofβ"-Al2O3 solid electrolyte describing the mass transfer and the behavior of electrode. The grain boundary effects were studied to give the perspective of the grain conductivity and grain boundary conductivity contribution to the total conductivity. Discussing the effects of grain boundary to the micro-structure of theβ"-Al2O3 solid electrolyte and ion transport mechanisms, revealed Na+ ion transport mechanisms. Electrochemical impedance measurement results were similar to the literature, obtained a relatively stable line detectionβ"-Al2O3 solid electrolyte conductivity method.

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