Electrochemical performance of silver/molybdotungstate-amorphous-electrolyte cells with charge-transfer-complex cathodes

For the quaternary fast ion conducting system AgIAg2OMoO3WO3, the highest ionic conductivity, 5.1 × 10-2 (μ cm)-1, was observed when using an amorphous electrolyte composition of 80%AgI-13.33%Ag2O-6.66% (0.7MoO3-0.3WO3). This electrolyte was used in the fabrication of solid-state electrochemical cells with the configuration (anode)/(amorphous electrolyte)/(cathode). The anode consisted of silver while a variety of organic charge-transfer-complex materials was employed as cathodes. The latter included phenothiazene, pyrene, and 2-perylene·3I2. Cell performance was assessed by studying open-circuit voltage (OCV), anodic and cathodic polarisation, current discharge capability, and load discharge characteristics. It was found that the cell with a 2-perylene·3I2 cathode yielded the highest OCV (657 mV) without any anodic or cathodic polarisation. The cell exhibited an internal resistance of 32 μ and a short-circuit current of 10 mA with a rechargeability having marginal coulombic efficiency. The diffusion co-efficients of silver ion were evaluated from the time dependence of cell voltage as a function of current density. The optimum current density (i.e., that giving no polarisation) was fixed and the load curves were recorded to evaluate the applicability of the cells to micropower sources and low-energy-density silver batteries. © 1989.