Exploring the suitability of natural rubber and natural graphite for Mg rechargeable cells

Recently, the suitability of using natural rubber (NR) in place of expensive, toxic polymers to prepare polymer electrolytes has been suggested. So far, according to available reports, no attention has been given to employ Sri Lankan NR for this purpose. This study is based on optimization and characterization of a NR based electrolyte and evaluation its suitability for a Mg rechargeable cell. The optimized composition, 63 MG49 Natural Rubber : 27 Mg(CF₃ SO₃ )₂) : 10 EC (by weight basis) exhibits a conductivity of 2.83 x 10^-4 Scm^-1 at room temperature. The electrolyte is purely an ionic conductor having a negligible electronic conductivity. Rechargeable cells are fabricated with configuration, Mg / NR based electrolyte / natural graphite. Open circuit voltage of the cell is 1.5 V which may motivate the intention of researchers. The value is quite suitable for low power requirements. Electrochemical Impedance Spectroscopy as well as Cyclic Voltammetry tests prove the absence of any parasitic reactions in the cells. Constant load discharge test results confirm a discharge capacity of 5.32 x 10^-3 Ahg^-1. Results prove the candidacy of NR as well as graphite to be used for cells with several highlights.