A high performance secondary battery which excels in the characteristics of its charge and discharge cycles and in its long-term reliability by virtue of its improved composite positive electrode, its improved electrolyte, and its improved composite negative electrode. In the secondary battery, the electrolyte is of a macromolecule compound having an ionic conductivity and containing one or more kinds of ionic compounds in a fused state. The composite positive and negative electrodes have the above macromolecule compound as their component material. <IMAGE>
