Novel network polymer electrolytes containing fluorine and sulfonic acid lithium prepared by ultraviolet polymerization

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 propanesulfonic acid, and trifluoroethyl methacrylate. The network polymer was activated with 1.0 M LiPF 6 /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°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.