Highly ion-conductive solid polymer electrolytes based on polyethylene non-woven matrix

• Published in: Electrochimica acta Vol. 52; no. 4; pp. 1582 - 1587
• Main Authors: Lee, Yong Min, Ko, Dong-Hyun, Lee, Jun Young, Park, Jung-Ki
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.12.2006; Elsevier
• Subjects: Anion receptor; Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Ion conductivity; Lithium polymer batteries; Polyethylene non-woven matrix; Solid polymer electrolyte; Polyethylene non-woven matrix; Lithium polymer batteries; Solid polymer electrolyte; Ion conductivity; Anion receptor; Cobalt oxide; Scanning electron microscopy; Electrical properties; Ionic conductivity; Polymer solid electrolyte; Secondary cell; Crosslink agent; Discharge charge cycle; Surface structure; Lithium battery; Electrodes; Ethylene oxide polymer; Conducting polymers; Morphology; Crosslinked polymer; Lithium oxide; Thermal analysis; Electrical characteristic; Electrochemical impedance spectroscopy
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2006.02.066

Highly ion-conductive solid polymer electrolyte (SPE) based on polyethylene (PE) non-woven matrix is prepared by filling poly(ethylene glycol) (PEG)-based crosslinked electrolyte inside the pores of the non-woven matrix. The PE non-woven matrix not only shows good mechanical strength for SPE to be a free-standing film, but also has very porous structure for high ion conductivity. The ion conductivity of SPE based on PE non-woven matrix can be enhanced by adding sufficient non-volatile plasticizer such as poly(ethylene glycol) dimethyl ether (PEGDME) into ion conduction phase without sacrificing mechanical strength. SPE with 20 wt.% crosslinking agent and 80 wt.% non-volatile plasticizer shows 3.1 × 10 −4 S cm −1 at room temperature (20 °C), to our knowledge, which is the highest level for SPEs. It is also electrochemically stable up to 5.2 V and has high transference number about 0.52 due to the introduction of anion receptor as an additive. The interfacial resistance between Li electrode and SPE is low enough to perform charge/discharge test of unit cell consisting of LiCoO 2/SPE/Li at room temperature. The discharge capacity of the unit cell shows 87% of theoretical value with 86% Coulombic efficiency.