A polymer-based electrolyte material for use in lithium ion batteries that exhibits high bulk ion conductivity at ambient and sub-ambient temperatures. The polymer electrolyte comprises a polymer matrix and a liquid electrolyte which is an organic solvent containing a free lithium salt. The polymer matrix is cross-linked and can be formed of cross-linkable ionic monomers, particularly ionic LLC surfactant monomers.
ACKNOWLEDGEMENT OF GOVERNMENT SUPPORT
 This invention was made with government support under grant number DE-FG02-04ER84093 awarded by the U.S. Department of Energy and grant number DMR 0213918 awarded by the National Science Foundation. The government has certain rights in the invention.