Lithium metal battery with solid polymer electrolyte

A battery comprising:

• an anode comprising a first electrochemically active material;
• a cathode comprising both a second electrochemically active material and a first electrolyte;
• and
• a second electrolyte interposed between the anode and the cathode;
• wherein at least one of the first electrolyte and the second electrolyte comprises a solid polymer electrolyte;
• wherein the solid polymer electrolyte has a glassy state, and comprises both at least one cationic diffusing ion and at least one anionic diffusing ion;
• wherein at least one of the at least one cationic diffusing ions comprises lithium;
• wherein at least one of the at least one cationic diffusing ion and the at least one of the anionic diffusing ion is mobile in the glassy state;
• and
• wherein the first electrochemically active material comprises a lithium metal;
• wherein the glassy state extends in a range of temperatures of the solid polymer electrolyte from a melting temperature of the solid polymer electrolyte to a temperature lower than the melting temperature;
• and
• wherein at least one of the at least one cationic diffusing ion and the at least one anionic diffusing ion has a diffusivity of greater than 1.0×10−12 m2/s.