ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Synthesis by UV-curing and characterisation of polyurethane acrylate-lithium salts-based polymer electrolytes in lithium batteries

Mustafa Hulusi Ugur, Hasan Kılıç, Mustafa Lütfü Berkem, and Atilla Güngör

Department of Chemistry, Marmara University, Fen Edebiyat Fakültesi Göztepe Kampüsü, 34722, Kadıköy — İstanbul, Turkey

E-mail: atillag@marmara.edu.tr

Abstract: UV-cured caprolactone-based polyurethane acrylate (PUA) polymer blend electrolytes were prepared and characterised. To develop polymer electrolytes suited to ambient temperature, an ionically-conductive and reliable polymer electrolyte based on urethane acrylate resins synthesised from a fluorine-containing di-functional oligomer 6F ethoxylated diacrylate, a di-functional reactive diluent 1,6-hexanediol diacrylate for adjusting the viscosity, and a radical photo-initiator doped with a mixture of lithium salts were used. Free-standing flexible electrolyte films were prepared by UV-curing via free-radical photopolymerisation. The performance of the lithium polymer cell system (Li/PE(F4)/LiCoO₂) was determined by electrochemical impedance spectroscopy, cyclic voltammetry, a galvanostatic recurrent differential pulse, chronocoulometry and chronoamperometry. The electrolyte with optimal amounts of fluorine-containing oligomer and optimal salt mixture content exhibited enhanced conductivity, showing a conductivity of 1.00 × 10⁻⁴ S cm⁻¹ at ambient temperature. The specific capacity, specific energy and specific power of a Li/PE(F4)/LiCoO₂ cell were also determined.

Keywords: polymer blends – conducting polymers – membranes – polyurethanes

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-014-0611-1

Chemical Papers 68 (11) 1561–1572 (2014)