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The use of ethyl acetate and methyl propanoate in combination with vinylene carbonate as ethylene carbonate-free solvent blends for electrolytes in Li-ion batteries

被引：66
作者：
Petibon, R. [1 ]
Harlow, J. [2 ]
Le, D. B. [3 ]
Dahn, J. R. [1 ,2 ]
机构：
[1] Dalhousie Univ, Dept Chem, Halifax, NS B3H4R2, Canada
[2] Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 3J5, Canada
[3] 3M Co, Ctr 3M, Elect Markets Mat Div, St Paul, MN 55144 USA
来源：
ELECTROCHIMICA ACTA | 2015年 / 154卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
ethyl acetate electrolyte; methyl propanoate electrolyte; ethylene carbonate-free electrolyte; lithium-ion batteries; vinylene carbonate; HIGH-PRECISION COULOMETRY; ELECTROCHEMICAL IMPEDANCE; PROPYLENE CARBONATE; AGING MECHANISMS; GRAPHITE ANODE; TEMPERATURE; CELLS; ADDITIVES; PERFORMANCE; STORAGE;
D O I：
10.1016/j.electacta.2014.12.084
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Li[Ni0.33Mn0.33Co0.33]O-2/graphite and LiCoO2/graphite pouch cells filled with a combination of ethyl acetate (EA) and vinylene carbonate (VC), or methyl propanoate (MP) and VC with 1 M LiPF6 function very well, even though these cells contain no ethylene carbonate, thought to be essential for the negative electrode solid electrolyte interphase (SEI). Cells filled with 1 M LiPF6 in MP:VC (95:5 w:w) showed similar capacity retention and impedance after 1700 h of cycling at 40 degrees C as cells filled with 1 M LiPF6 in EC:ethyl methyl carbonate (EMC) + 2% VC. Cells filled with these ester containing electrolytes also showed better rate performance when cycled at -14 degrees C, delivering 40% of the discharge energy at a current equivalent to 4 C, while cells filled with EC:EMC + 2% VC failed to deliver any capacity at a current of 3 C. High precision coulometry measurements also showed that cells filled with 1 M LiPF6 in MP:VC (95:5 w:w) had similar coulombic efficiency and charge endpoint capacity slippage as cells filled with 1 M LiPF6 EC:EMC + 2% VC which indicates ester based electrolytes can have long lifetime. (C) 2014 Elsevier Ltd. All rights reserved.
引用
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页码：227 / 234
页数：8
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