Novel gel network polymer electrolytes containing fluorine and sulfonic acid lithium were prepared by the ultraviolet polymerization of poly(ethylene glycol) dimethyl acrylate, 2-acrylamido-2-methyl propane-sulfonic acid, and trifluoroethyl methacrylate. The network polymer was activated with 1.0M LiPF6/ethylene carbonate/ dimethyl carbonate solutions (ethylene carbonate/dimethyl carbonate = 1 : 1 v/v) to prepare gel network polymer electrolytes. The characteristics of the polymer networks, including the gel fractions, thermal stability, liquid electrolyte uptake, and electrochemical properties, were studied. When the poly(ethylene glycol) dimethylacrylate/2-acrylamido-2-methyl propanesulfonic acid/trifluoroethyl methacrylate weight ratio was 60 : 35 : 5, the network polymer electrolytes showed the highest liquid electrolyte uptake (144%) and ionic conductivity (ca. 10(-3) S/cm) at room temperature (25 degrees C). The network polymer electrolytes were electrochemically stable up to 5.0 V versus Li+/Li. The excellent performances of the network polymer electrolytes suggest that they are suitable for application in high-performance lithium-ion batteries. (C) 2008 Wiley Periodicals, Inc.