Impedance Reducing Additives and Their Effect on Cell Performance I. LiN(CF3SO2)2

被引：37
|
作者：
Burns, J. C. [1 ]
Sinha, N. N. [1 ]
Jain, Gaurav [2 ]
Ye, Hui [2 ]
VanElzen, Collette M. [2 ]
Lamanna, W. M. [3 ]
Xiao, A. [3 ]
Scott, Erik [2 ]
Choi, J. [3 ]
Dahn, J. R. [1 ]
机构：
[1] Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 3J5, Canada
[2] Brooklyn Ctr, Medtron Energy & Component Ctr, Brooklyn Ctr, MN 55430 USA
[3] 3M Co, Ctr 3M, St Paul, MN 55144 USA
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2012年 / 159卷 / 07期
基金：
加拿大自然科学与工程研究理事会;
关键词：
LI-ION CELLS; HIGH-PRECISION COULOMETRY; ELECTRODE MATERIALS; BATTERIES; GROWTH;
D O I：
10.1149/2.077207jes
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 and Li[Ni0.42Mn0.42Co0.16]O-2/graphite cells with 1 M LiPF6 in EC:EMC (3: 7 by wt) electrolyte containing 2 wt% vinylene carbonate (VC) and/or lithium bis (trifluoromethanesulphonyl) imide (LiTFSI or 3M Fluorad Lithium HQ-115) were studied using the High Precision Charger at Dalhousie University, automated cycling/storage, AC impedance and long-term cycling at elevated temperature. The additive, VC, improves lifetime performance by increasing coulombic efficiency and decreasing charge and discharge end point capacity slippage, while the impact of HQ-115 alone on lifetime is minimal. However, HQ-115 reduces cell impedance when added to either control or VC-containing electrolyte. Therefore it serves as a useful additive for improving the rate capability of cells and capacity retention during high rate cycling at elevated temperature. It is our opinion that Li-ion cells incorporating VC can benefit from a simultaneous addition of HQ-115 due to a synergistic effect observed between HQ-115 and VC additives. This report is the first of two companion reports studying impedance reducing additives and their impact on cell lifetime. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.077207jes] All rights reserved.
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页码：A1095 / A1104
页数：10
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