Phase transitions and diffusion kinetics during Mg2+- and Li+-ion insertions into the Mo6S8 chevrel phase compound studied by PITT

被引：64

作者：

Levi, MD ^{[1
]}

Lancry, E ^{[1
]}

Gizbar, H ^{[1
]}

Gofer, Y ^{[1
]}

Levi, E ^{[1
]}

Aurbach, D ^{[1
]}

机构：

[1] Bar Ilan Univ, Dept Chem, IL-52900 Ramat Gan, Israel

来源：

ELECTROCHIMICA ACTA | 2004年 / 49卷 / 19期

基金：

以色列科学基金会;

关键词：

PITT; chemical diffusion coefficient; solid-state ionic conductivity; chevrel compound; Cottrell behavior; moving boundary; short-range; attraction;

D O I：

10.1016/j.electacta.2004.02.034

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Careful potentiostatic intermittent titrations (PITT) were performed in order to study Li+- and Mg2+ -ion insertions into the Mo6S8 chevrel phase compound. Potential dependences of equilibrium and dynamic characteristics of the insertion processes, such as the differential intercalation capacitance, C-dif, the chemical diffusion coefficient, D, and the specific ionic conductivity, K, were measured and interpreted in terms of lattice-gas models with highly attractive interactions between the inserted ions. Li-ion conductivity of the slightly intercalated chevrel phase is much higher than that of Mg-ions, which can be attributed to a higher charge density of the latter ion and to its higher polarization effect on the S-8 anions' lattice of the host material. Some crystallographic arguments related to the low mobility of the Mg-ion on the one hand, and the extremely high mobility of most of the divalent d-metal cations in the Mo6S8 chevrel phase on the other hand, are discussed. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：3201 / 3209

页数：9

共 37 条

[31] SHORT-RANGE ELECTRON-ION INTERACTION EFFECTS IN CHARGING THE ELECTROACTIVE POLYMER-FILMS [J].