A polymer electrolyte material that has both structural and conductive phases and is easy and inexpensive to manufacture is provided. The material has rigid spheres in a close-packed arrangement. Some or essentially all of the spheres are connected to their nearest neighbors through a fusion process. A solution of conductive electrolyte fills the interstices. Such an electrolyte offers excellent resistance to growth of lithium dendrites in secondary lithium battery cells.
STATEMENT OF GOVERNMENT SUPPORT
 The invention described and claimed herein was made in part utilizing funds supplied by the U.S. Department of Energy under Contract No. DE-OE0000223. The Government has certain rights in this invention.