International Journal of Applied Science and Technology Vol. 8, No. 3, September 2018 doi:10.30845/ijast.v8n3p8 87 Jones-Dole Coefficients and Conductivity Studies on Electrolyte Solutions of Magnesium Borohydride in Mixtures of 1,2-Dimethoxyethane–Propylene Carbonate and 2-Methoxyethyl Ether–Propylene Carbonate John N. Obowu Department of Pure and Industrial Chemistry University of Port Harcourt, P.M.B. 5323, Choba Port Harcourt, Nigeria. Millicent U. Ibezim-Ezeani* Department of Pure and Industrial Chemistry University of Port Harcourt, P.M.B. 5323, Choba Port Harcourt, Nigeria. Augustine A. Abia Department of Pure and Industrial Chemistry University of Port Harcourt, P.M.B. 5323, Choba Port Harcourt, Nigeria. Abstract The study on the competing influences of ion-ion, ion-dipole and dipole-dipole interactions by the species in magnesium borohydride [Mg(BH4)2] organic electrolyte solutions is reported. The organic electrolyte solutions were formulated by dispersing Mg(BH4)2 salt concentrations of 0.01, 0.05, 0.10 and 0.50 M in mixed solvent systems of 1,2-dimethoxyethane (DME)-propylene carbonate (PC) and 2-methoxyethyl ether (DGM)-propylene carbonate (PC). The density, viscosity, conductivity and dielectric constant were determined at different system compositions. The measured viscosity data varied with concentration according to Jones-Dole equation, while the resolved coefficients revealed that DME-PC and DGM-PC mixtures acted as solvates in the Mg(BH4)2 organic electrolyte solutions. The A coefficient values for DME-PC and DGM-PC systems increased progressively with mole fractions over the entire range studied. The B coefficient values for the electrolyte systems were found to exhibit minimum value at 0.822 and 0.095 mole fractions of DME and DGM respectively. The experimental conductivities of the electrolyte solutions measured at temperatures of 298.15, 308.15, 318.15, 328.15 and 338.15K increased with increase in temperature from 0 - 50 % vol. composition range; and thereafter, decreased for both DME-PC and DGM-PC systems. This suggests that the most preferred mix ratio of the studied systems is 50 % vol. of component (DME or DGM) for optimum battery performance. Keywords: Battery, Ion-dipole interaction, Columbic efficiency, Electrolyte, Jones-Dole Coefficients 1. Introduction Batteries consist of assembled cells designed solely for the conversion of chemical energy into electrical energy (Hannan et al., 2017). Electrical energy is ubiquitous and its application continues to grow globally. Primarily, electric energy is exploited for heating, lighting and for powering electronics; such as integrated circuit memory retention and biomedical implantable devices. An important battery concept relates to the quantity of load current delivered by the battery and its duration. This is stated as battery capacity (C) and is quoted in Ampere Hours (Ah); for a specific discharge rate to End Point (Output Voltage). The energy density of a cell is quoted in weight (kg) or volume (cm 3 ) ratio. Another important battery parameter is the coulombic efficiency, defined as the quotient of the charge that leaves the battery in the course of discharge cycle to the charge that passes into the battery in the course of charging cycle. 100 % columbic efficiency is not achievable owing to charge losses from secondary reactions, such as redox reactions in the battery. Better conductivity advances battery reversibility and lessen the voltage differential between the discharge and charge curves. Higher coulombic efficiency means that the level of irreversible drawback reactions in the cell is reduced. The storage of electrical energy necessitates its conversion to another form of energy.