Synthesis and conductivity of PEGME branched poly(ethylene-alt-maleimide) based solid polymer electrolyte

A thermally stable comb-like polymer electrolyte, poly(ethylene glycol) mon omethyl ether (PEGME) grafted poly(ethylene-alt-maleimide), has been synthe sized and characterized. The copolymer was thermally stable up to 250 degre es C and had good film forming property. The copolymer was well mixed with poly(ethylene glycol) dimethyl ether(PEGDME, (M) over bar w = 400). The act ivation energy of ionic conduction decreased and conductivity increased wit h the increase of PEGDME content in the polymer electrolyte. The maximum co nductivity of the resulting polymer electrolyte containing 66 wt% of PEGDME was found to be 3 x 10(-4) S/cm at 30 degrees C. The polymer electrolyte s howed electrochemical stability window of greater than 4.7 V.