Study of Electrolyte Additives Using Electrochemical Impedance Spectroscopy on Symmetric Cells

被引：139
作者：
Petibon, R. [1 ]
Aiken, C. P. [2 ]
Sinha, N. N. [2 ]
Burns, J. C. [2 ]
Ye, Hui [3 ]
VanElzen, Collette M. [3 ]
Jain, Gaurav [3 ]
Trussler, S. [2 ]
Dahn, J. R. [1 ,2 ]
机构：
[1] Dalhousie Univ, Dept Chem, Halifax, NS B3H 4R2, Canada
[2] Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 3J5, Canada
[3] Brooklyn Ctr, Medtron Energy & Component Ctr, Brooklyn Ctr, MN 55430 USA
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2013年 / 160卷 / 01期
关键词：
LI-ION; TEMPERATURE; STORAGE;
D O I：
10.1149/2.005302jes
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Wound LiCoO2/graphite cells with 1M LiPF6 EC:EMC electrolyte containing 1 wt%, 2 wt% vinylene carbonate (VC), 0.3 wt% trimethoxyboroxine (TMOBX) and 2 wt% VC + 0.3 wt% TMOBX were subjected to extended storage studies. After storage, the electrodes were studied using the symmetric cell and electrochemical impedance spectroscopy (EIS) approach described by previous workers. This approach allows the impact of an additive on the impedance of the negative and the positive electrode to be distinguished. Compared to the control cells, adding 1 wt% VC reduced the positive electrode impedance and only slightly affected the negative electrode impedance. Adding 2 wt% VC reduced the positive electrode impedance and greatly increased the negative electrode impedance. An addition of 0.3 wt% TMOBX greatly decreased the positive electrode impedance and slightly increased the negative electrode impedance. Compared to the cells with 2% VC only, adding 2% VC + 0.3% TMOBX decreased the positive electrode impedance without affecting the negative electrode impedance leading to a significant reduction in full cell impedance. These results help explain why the combination of VC and TMOBX additives can be effective in LiCoO2/graphite cells designed for long life time. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.005302jes] All rights reserved.
引用
收藏
页码：A117 / A124
页数：8
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