收录:
摘要:
Li4Ti5O12 thin film electrodes are successfully deposited on Pt/Ti/SiO2/Si substrates by pulsed laser deposition (PLD) technique. The microstructure and morphology of Li4Ti5O12 thin films are characterized by XRD and ESEM. The electrochemical properties of Li4Ti5O12 thin film electrodes are evaluated by galvanostatic cycling test. The kinetic behavior of lithium ions in Li4Ti5O12 thin film electrodes is also conducted using cyclic voltammetry (CV), galvanostatic intermittent titration technique (GITT), and electrochemical impedance spectroscopy (EIS). Li4Ti5O12 thin film electrodes show favorable specific capacities and cycle performance. The chemical diffusion coefficients are found to be in a range of 10(-15) to 10(-12) cm(2) s(-1) determined by GITT method. The kinetic parameters obtained from impedance spectra as a function of the cell voltage are investigated in details. The decrease of the charge-transfer resistance (R-ct) can be explained by the two-phase transition during lithium insertion into Li4Ti5O12. (C) 2014 Elsevier B.V. All rights reserved.
关键词:
通讯作者信息:
电子邮件地址:
来源 :
APPLIED SURFACE SCIENCE
ISSN: 0169-4332
年份: 2014
卷: 314
页码: 936-941
6 . 7 0 0
JCR@2022
ESI学科: MATERIALS SCIENCE;
ESI高被引阀值:341
JCR分区:1
中科院分区:2