高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (1): 9.

• 论文 • 上一篇    下一篇

LiAgSO4-Al2O3复合电解质的导电性研究

陶善文, 刘杏芹, 彭定坤, 孟广耀   

  1. 中国科技大学材料科学与工程系, 合肥, 230026
  • 收稿日期:1996-12-06 出版日期:1998-01-24 发布日期:1998-01-24
  • 通讯作者: 孟广耀
  • 作者简介:陶善文,男,29岁,博士研究生.
  • 基金资助:

    国家自然科学基金资助课题.

Studies on the Conductivity of LiAgSO4-Al2O3 Composite Electrolyte

TAO Shan-Wen, LIU Xing-Qin, PENG Ding-Kun, DENG Guang-Yao   

  1. Department of Materials Science and Engineering, University of science and Technology of China, Hefei, 230026
  • Received:1996-12-06 Online:1998-01-24 Published:1998-01-24

摘要: 研究了分散第二相α-Al2O3对LiAgSO4的离子导电性的影响,发现LiAgSO4-α-Al2O3的电导率随α-Al2O3含量的增加而升高,在300~500℃间电导率高于纯LiAgSO4,α-Al2O3含量摩尔比约为40时最高.TG-DTA和XRD分析表明,在高温稳定的体心立方LiAgSO4降温后以Ag2SO4的正交β相形式存在,但在H2O存在下,生成Li2SO4·H2O和Ag2SO4.FT-IR分析证实,在α-Al2O3与硫酸盐之间没有发生明显的化学反应.H2浓差电池测试结果表明,该材料具有质子导电性,但由于高温下Ag2SO4被H2还原使材料不稳定,故不能在强还原气氛下使用.

关键词: 电导率, 复合电解质, 第二相&alpha, -Al2O3, LiAgSO4, 质子导电性

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

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