Сhapter 11 - Nanocomposite Alkali-Ion Solid Electrolytes

Abstract

Surface and interface phenomena in composite solid electrolytes are considered. The Stern model is applied to the calculation of the surface potential and concentration of point defects on surfaces, grain boundaries, and interfaces. Size effects in nanocomposite solid electrolytes are discussed. Results of molecular dynamics simulation are demonstrated to illustrate structural changes and enhanced diffusion of ionic near the interfaces in composites. Approaches for estimation of transport properties of composite solid electrolytes are considered and examples of application of a generalized mixing equation to estimation of conductivity of composites are presented. Transport properties of nanocomposite alkali-ion solid electrolytes are reviewed, including lithium ion conducting composite solid electrolytes and composites with conductivity governed by large sized cations like rubidium and cesium. Special attention is paid to polymer and glass-ceramic composite lithium-ion electrolytes as well as to practical applications of alkali-ion nanocomposite solid electrolytes in solid state electrochemical devices.