Effect of nanosized CeO_2 on the electrical and mechanical properties in(PEO)_(10)LiClO_4 polymer electrolyte

Using nanosized rare earth oxide CeO2 as filler and acetonitrile as organic solvent,the novel solid-state composite polymer electrolyte(CPE) films(PEO)10LiClO4-x wt% CeO2(x=0,2,6,9,12,15) was prepared by solution-casting technique.The AC impedance spectra show that the ionic conductivity of CPE can be improved obviously by adding appropriate nanosized CeO2,in order that CeO2 nano-particles can effectively inhibit the PEO from crystallizing and expand the amorphous region required for the lithium-ion transport.The highest ionic conductivity of 1.71×10-5S/cm is achieved at room temperature with the CeO2 content of 9wt%,but too many CeO2 particles will obstacle lithium-ion transfer.XRD observations confirm this conclusion.Meanwhile,CeO2 nano-particles can well disperse and transmit of extra-force,the tensile strength(TS) of CPEs are greatly improved.The TS can be achieved 2.07MPa with the CeO2 content of 15wt%,4.45 times than pure(PEO)10LiClO4 system.