In an attempt to enhance the room temperature ionic conductivity of PEO‐LiX films, samples have been exposed to gamma‐irradiation at 78°C. The success with which cross‐links have been introduced into the amorphous form has been evaluated from d.s.c. analysis and temperature‐dependent conductivity data. Retardation of the recrystallisation event, associated with uncomplexed poly(ethylene oxide), does not occur over a range of total doses. Changes in overall conductivity levels for the PEO‐LiCF3SO3 ([EO units]/[Li] = 9) system, indicate light cross‐linking at 2.25 Mrad of exposure. However, higher doses result in a substantial amount of chain scission, leading eventually to poor mechanical properties. A similar study on PEO‐LiClO4 ([EO units]/[Li] = 20) confirms that the above route is an ineffective method to improve room temperature conductivity.
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