Comparative study of electrolyte additives using electrochemical impedance spectroscopy on symmetric cells

被引：45
作者：
Petibon, R. [1 ]
Sinha, N. N. [2 ]
Burns, J. C. [2 ]
Aiken, C. P. [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] Medtron Energy & Component Ctr, Brooklyn Ctr, MN USA
来源：
JOURNAL OF POWER SOURCES | 2014年 / 251卷
关键词：
Electrolyte additives; Impedance spectroscopy; Precision coulometry; Solid electrolyte interphase; HIGH-PRECISION; ION BATTERIES; PERFORMANCE;
D O I：
10.1016/j.jpowsour.2013.11.054
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：
The effect of various electrolyte additives and additive combinations added to a 1 M LiPF6 EC:EMC electrolyte on the positive and negative electrodes surface of 1 year old wound LiCoO2/graphite cells and Li[Ni0.4Mn0.4Co0.2])O-2/graphite cells was studied using electrochemical impedance spectroscopy (EIS) on symmetric cells. The additives tested were: vinylene carbonate (VC), trimethoxyboroxine (TMOBX), fluoroethylene carbonate (FEC), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and H2O alone or in combination. In general, compared to control electrolyte, the additives tested reduced the impedance of the positive electrode and increased the impedance of the negative electrode with the exception of LiTFSI in Li[Ni(0.4)Mn(0.4)ACo(0.2)]O-2/graphite wound cells. Higher charge voltage led to higher positive electrode impedance, with the exception of 2%VC + 2% FEC, and 2% LiTFSI. In some cases, some additives when mixed with another controlled the formation of the SEI at one electrode, and shared the formation of the SEI at one electrode when mixed with a different additive. (C) 2013 Elsevier B.V. All rights reserved.
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页码：187 / 194
页数：8
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