非晶锂离子导体在高压下的电特性

The Pressure Dependence of Ionic Conductivity of Amorphous Lithium Ionic Conductor

Center of Fundamental Physics, University of Science and Technology of China, Hefei 230026, China

摘要: 本文首次测量了非晶态锂离子导体B2O3-0.7Li2O-0.7LiCl-xAl2O3（x=0.05及0.15）在0.000 1~0.80 GPa压力下的离子电导率及激活体积，发现激活体积在一定压力下由负变正，并用离子迁移通道的物理图象给出初步的微观解释。此外，还比较了整片非晶与粉末压片的异同，以及氧化铝组分不同对压力相变点的影响。观测到压力增强及卸压后电导率的弛豫现象减至常压后离子电导比加压前提高10.4倍。
- 快离子导体 /
- 非晶态 /
- 离子迁移通道
Abstract: The ionic conductivity and the activation volume of amorphous lithium ionic conductors B2O3-0.7Li2O-0.7LiCl-xAl2O3 (x=0.05 and 0.15) under pressure from the atmosphere to 0.80 GPa were investigated for the first time. It is found that their activation volumes have changed from negative to positive under a certain pressure. The first microcosmic explanation is given by the physics picture of the ionic transport passages. Moreover, the two kinds of specimen i. e., the whole large piece and the tablet of powder are compared; the effect of alumina content on the phase transformation pressure is discussed. The pressure relaxation has been observed, the ionic conductivity when unloading to the atmosphere increases by 10.4 times compared to the original one.
- fast ionic conductor (superionic conductor) /
- amorphous state /
- ionic transport passage