THERMODYNAMIC BEHAVIOR OF NI-CD AND NI-H-2 BATTERIES OVER WIDE RANGESOF TEMPERATURES (0-200-DEGREES-C), KOH CONCENTRATIONS (0.1-20 MOL KG(-1)) AND H-2 PRESSURE (0.1-500 BAR)

For simulating the full discharged and charged states of nickel-cadmiu m and nickel-hydrogen batteries, thermodynamic characteristics such as the equilibrium E-e and thermoneutral E-T potentials of the cells hav e been calculated over wide ranges of temperatures (0 degrees-200 degr ees C), potassium hydroxide concentrations (0.1-20 mol kg(-1)) and hyd rogen pressures (0.1-500 bar). The effects of non-ideality of the hydr ogen gas phase and potassium hydroxide aqueous solution were taken int o account by using available thermodynamic and experimental data. The effect of temperature, potassium hydroxide concentration, and hydrogen pressures on E-e and E-T have been analyzed. (C) 1998 Elsevier Scienc e S.A.