Li-ion diffusion in highly (003) oriented LiCoO2 thin film cathode prepared by pulsed laser deposition

被引:143
|
作者
Tang, S. B. [1 ]
Lai, M. O. [1 ]
Lu, L. [1 ]
机构
[1] Natl Univ Singapore, Dept Mech Engn, Singapore 117576, Singapore
关键词
LiCoO2 thin film; pulsed laser deposition; diffusion coefficient;
D O I
10.1016/j.jallcom.2005.12.131
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A pure, well crystallized and highly (0 0 3) oriented LICoO2 thin film was deposited on stainless steel substrates by pulsed laser deposition. The overall diffusion coefficients of lithium-ion in the potential range between 3.85 and 4.2 V were measured by three different electrochemical methods namely, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and potentiostatic intermittent titration technique (PITT). From CV the apparent chemical diffusion coefficient of lithium-ion was estimated to be 2 x 10(-13) cm(2)/s. EIS revealed that the charge-transfer resistance obviously decreased above 3.90 V and changed little up to 4.22 V. The diffusion coefficients obtained from EIS were in the order of 10(-12) cm(2)/s while they were in the range of 6 x 10(-13) and 8 x 10(-12) cm(2)/s from PITT, depending on the potentials. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:300 / 303
页数:4
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