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With surging interest in high energy density solid state lithium rechargeable batteries and discoveries of high voltage cathode materials such as LiMn2O4 and LiCO2, it is imperative that useful solid electrolytes possess a voltage window of about 5 volts. These solid electrolytes after being assembled into a cell will be subjected to a dc bias potential equal to cell voltage. The ability of composite electrolytes to withstand the dc potential has been determined, discussed, and presented. The experimental data include linear sweep and cyclic voltammetry measurements. The data are analyzed in terms of dielectric breakdown, ionization, and electrodic reactions.

Lithium ion conductivity of a lithium compound is known to be influenced by an inert, non-lithium ion conductor additive. This paper reports an investigation of the effects of boron nitride (BN) addition to the conductivity of lithium iodide (Lil). The Lil:BN stoichiometry and heat treatment parameters (temperature and time) have been used as variables. It will be shown that lithium conductivity is strongly dependent upon heat treatment parameters. The activation energy for lithium ion transport also decreases with the addition of BN. Further analysis of activation energy data suggests that lithium ion motion takes place through interfacial regions of Lil and BN phases.