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.

引用

页码：A1095 / A1104

页数：10

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