TY - JOUR
T1 - The Study of Electrolyte Solutions Based on Ethylene and Diethyl Carbonates for Rechargeable Li Batteries II. Graphite Electrodes
AU - Aurbach, Doron
AU - Ein-Eli, Yair
AU - Markovsky, Boris
AU - Zaban, Arie
PY - 1995
Y1 - 1995
N2 - The electrochemical behavior of Li-graphite intercalation anodes in ethylene and diethyl carbonates (EC-DEC) solutions was studied using surface sensitive Fourier transform infrared spectroscopy (FTIR) and impedance spectroscopy in conjunction with standard electrochemical techniques. Three different solvent combinations, four different salts: LiBF4, LiPF6, LiC1O4, and LiAsF6, and the influence of the presence of CO2 were investigated. Graphite electrodes could be cycled hundreds of times obtaining a reasonable reversible capacity. The best electrolyte was found to be LiAsF6 and the presence of CO2 in solutions considerably increased the reversible capacity upon cycling. This improved performance is due to precipitation of the ethylene carbonate reduction product, (CH2OCO2Li)2, which is an excellent passivating agent, on the electrode surface. Aging processes of these surface films and their influence on the electrode properties are discussed.
AB - The electrochemical behavior of Li-graphite intercalation anodes in ethylene and diethyl carbonates (EC-DEC) solutions was studied using surface sensitive Fourier transform infrared spectroscopy (FTIR) and impedance spectroscopy in conjunction with standard electrochemical techniques. Three different solvent combinations, four different salts: LiBF4, LiPF6, LiC1O4, and LiAsF6, and the influence of the presence of CO2 were investigated. Graphite electrodes could be cycled hundreds of times obtaining a reasonable reversible capacity. The best electrolyte was found to be LiAsF6 and the presence of CO2 in solutions considerably increased the reversible capacity upon cycling. This improved performance is due to precipitation of the ethylene carbonate reduction product, (CH2OCO2Li)2, which is an excellent passivating agent, on the electrode surface. Aging processes of these surface films and their influence on the electrode properties are discussed.
UR - http://www.scopus.com/inward/record.url?scp=0029373208&partnerID=8YFLogxK
U2 - 10.1149/1.2048659
DO - 10.1149/1.2048659
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SN - 0013-4651
VL - 142
SP - 2882
EP - 2890
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 9
ER -
