R. Idris et al., Polymer electrolytes based on modified natural rubber for use in rechargeable lithium batteries, J POWER SOU, 94(2), 2001, pp. 206-211
Citations number
18
Categorie Soggetti
Physical Chemistry/Chemical Physics","Environmental Engineering & Energy
Modified natural rubber (NR) polymer hosts having low transition glass temp
eratures have been investigated. Three types of modified NR, namely 25% epo
xidised NR (ENR-25), 50% ENR (ENR-50) and polymethyl methacrylate grafted N
R (MG-49) were employed. Results are reported for ionic conductivity and th
ermal properties for both unplasticised and plasticised polymer electrolyte
systems. The samples were in the form of free standing films with the thic
kness 0.2-0.5 mm and mixtures of ethylene carbonate (EC) and propylene carb
onate (PC) were used as plasticisers. Unplasticised modified NR based syste
ms 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 yield
ed 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 dis
played 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. (C) 2001 Elsevier Science B.V. All r
ights reserved.