Forty years of composite polymer electrolytes – a subjective view

Abstract Solid polymer electrolytes (SPEs) with various fillers improving their properties are studied for about forty years. The continuous research is fostered by the vision of all solid-state lithium batteries (ASSLBs) regarded by the energy-storage community as one of the most important goals. This comprehensive review summarizes these efforts from a position of a person who witnessed the development of Composite Polymer Electrolytes (CPEs) from the very beginning.