Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 149, Issue 8, Pages A1079-A1082Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1490356
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In this work we demonstrate that the fluorination of alkyl substituents on phosphate can reduce the viscosity, enhance flame-retarding efficiency, and increase electrochemical stability of the cosolvents. Therefore the new flame retardant can be used at a concentration greater than 20% in the electrolyte, as a cosolvent, in order to formulate a completely nonflammable electrolyte that works in lithium-ion cells. This new electrolyte formulation not only increases the safety feature of the lithium-ion battery, while maintaining the capacity utilization and rate capability, but also improves the capacity retention of the cell. The trade-off between electrolyte nonflammability and performance in the cell is thus alleviated by the introduction of fluorine in the structure of the flame retardants. (C) 2002 The Electrochemical Society.
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