Polymer electrolytes based on modified natural rubber for use in rechargeable lithium batteries

• Published in: Journal of power sources Vol. 94; no. 2; pp. 206 - 211
• Main Authors: Idris, Razali, Glasse, M.D, Latham, R.J, Linford, R.G, Schlindwein, W.S
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 01.03.2001; Elsevier Sequoia
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Epoxidised natural rubber; Exact sciences and technology; Plasticiser; Poly(methyl methacrylate)-grafted natural rubber; Polymer electrolytes; Epoxidised natural rubber; Plasticiser; Polymer electrolytes; Poly(methyl methacrylate)-grafted natural rubber; Thermal properties; Battery; Ionic conductivity; Polymer solid electrolyte; Methyl methacrylate polymer; Lithium; Secondary cell; Natural rubber
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/S0378-7753(00)00588-7

Modified natural rubber (NR) polymer hosts having low transition glass temperatures have been investigated. Three types of modified NR, namely 25% epoxidised NR (ENR-25), 50% ENR (ENR-50) and polymethyl methacrylate grafted NR (MG-49) were employed. Results are reported for ionic conductivity and thermal properties for both unplasticised and plasticised polymer electrolyte systems. The samples were in the form of free standing films with the thickness 0.2–0.5 mm and mixtures of ethylene carbonate (EC) and propylene carbonate (PC) were used as plasticisers. Unplasticised modified NR based systems exhibit ionic conductivities in 10 −6–10 −5 S cm −1 range at ambient temperatures. Incorporating 50–100% of EC/PC by weight to the systems yielded mechanically stable films and ionic conductivities in 10 −4–10 −3 S cm −1 range at ambient temperature. The thermal event of the systems has displayed an increasing trend of transition glass temperature at elevated salt concentration whereas incorporation of EC and PC into the systems leads to marked reduction in their T g values.