A novel class of polyethylene oxide (PEO)-based composite polymer electrolyte (CPE) by using shape-selective molecular sieves ZSM5 as filler were obtained by solvent casting method. The effects of ZSM5 on the electrochemical properties of the PEO-LiClO₄-ZSM5, such as ionic conductivity, lithium ion transference number and interfacial stability with lithium electrode were studied by electrochemical AC impedance spectroscopy and steady-state current method. The experiment results showed that the addition of ZSM5 could improve the lithium ion transference number and enhance the ionic conductivity of PEO-LiClO₄ at the same time. The highest room temperature ionic conductivity of 1.4×10^－5 S•cm^－1 and lithium ion transference number of 0.353 were recorded when the content of ZSM5 was up to 10%. The good compatibility with the lithium electrode ensured the use of PEO-LiClO₄-ZSM5 as the electrolyte materials for all solid-state rechargeable lithium ion batteries.

Key words: composite polymer electrolyte, , ZSM-5, ionic conductivity, lithium ion transference number, interfacial stability