Studies on the Conductivity of LiAgSO4-Al2O3 Composite Electrolyte

Abstract

Abstract: The effects of dispersed second phase α-Al₂O₃ to the ionic conductivity of LiAgSO₄ were studied in this paper. It was found that the conductivity of LiAgSO₄ (α-Al₂O₃) system rised. with increasing amount of α-Al₂O₃ added. It reaches a maximum value around x(α-Al₂O₃) 40% contained, which is higher than pure LiAgSO₄ within the range of 300～500 C. According to the results from TG-DTA and XRD, we have recognized the existence of LiAgSO₄ solid solution with orthorhombic structure. This solid solution can be obtained through calcining process and is metastable down to room temperature. But it is easy to react with water to form Li₂SO₄·H₂O and Ag₂SO₄. FT-IR result indicates that there is no obvious chemical reaction between α-Al₂O₃ and the sulfates. The experiment results of hydrogen concentration cell demonstrates that this material is proton-conducting, but is unstable at high temperature because Ag₂SO₄ is reduced by hydrogen. Therefore, it can not be applied in strong reducing atmosphere.

Key words: Conductivity, Composite electrolyte, Second phase α-Al₂O₃, LiAgSO₄, Proton conductor

CLC Number:

O738

TrendMD:

TAO Shan-Wen, LIU Xing-Qin, PENG Ding-Kun, DENG Guang-Yao . Studies on the Conductivity of LiAgSO₄-Al₂O₃ Composite Electrolyte[J]. Chem. J. Chinese Universities, 1998, 19(1): 9.

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Studies on the Conductivity of LiAgSO₄-Al₂O₃ Composite Electrolyte

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