Electrochemical Behavior of Nonflammable Organo-Fluorine Compounds for Lithium Ion Batteries
- 1 January 2009
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 156 (6), A483-A488
- https://doi.org/10.1149/1.3111904
Abstract
The electrochemical behavior of organo-fluorine compounds with antioxidation ability has been investigated. Oxidation currents of fluorine-compound-containing ethylene carbonate (EC)/diethyl carbonate (DEC) solutions were much smaller than those of EC/DEC and EC/DEC/propylene carbonate (PC) at potentials higher than 6 V vs Li/Li+Li/Li+ . Electrochemical reduction of fluorine compounds started at ca. 2 V vs Li/Li+Li/Li+ , higher than those for EC, DEC, and PC. However the first coulombic efficiencies for natural graphite electrodes in fluorine-compound-containing EC/DEC mixtures were nearly the same as those in EC/DEC without an increase in irreversible capacities. Furthermore the first coulombic efficiencies in fluorine-compound-containing EC/DEC/PC mixtures were much larger than those in EC/DEC/PC itself. The results show that the fluorine compounds used in the present study can be used as nonflammable solvents for lithium ion batteries.Keywords
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