The polymer electrolyte based on polysiloxane containing both alkyl cyanide and oligo ethylene oxide pendants

• Published in: Electrochimica acta 2004-11, Vol.50 (2), p.311-316
• Main Authors: Lee, Young Sik, Song, Gi Sang, Kang, Yongku, Suh, Dong Hack
• Format: Article
• Language: English
• Subjects: Alkyl cyanide; Applied sciences; Chemistry; Corrosion; Corrosion mechanisms; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrochemistry; Ethylene oxide; Exact sciences and technology; General and physical chemistry; Metals. Metallurgy; Network; Polymer electrolyte; Polysiloxane
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2004.01.097

The monomers, (3-cyanopropyl) methylsiloxane cyclics (D4CN) and (3-(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)propyl) methylsiloxane cyclics (D4TEG) were prepared by a hydrosilylation reaction of 2,4,6,8-tetramethylcyclotetrasiloxane (D4H) with allyl cyanide and tri(ethylene glycol) methyl allyl ether (allyl TEG), respectively, in toluene using a platinum(0)-1,3-divinyl-1,1,3,3-tetramethyl disiloxane complex as the catalyst. The new crosslinkable polymers with alkyl cyanide and ethylene oxide groups as the pendent were synthesized by ring opening polymerization and characterized by GPC and 1H NMR. And then, the crosslinked solid polymer electrolyte was prepared by UV radiation curing. The conductivities of samples were measured by impedance spectroscopy using an indium–tin oxide (ITO) electrode. As the results, the maximum ionic conductivities of the polymer were 1.15 × 10 −5 S cm −1 at 20 °C and 1 × 10 −4 S cm −1 at 60 °C. The electrolyte was stable electrochemically to 5 V versus Li +/Li at room temperature.