Assessment of Polymer‐Electrolyte Batteries for EV and Ambient Temperature Applications

The feasibility of polyether‐based all‐solid‐state cells has been assessed in a joint research and development program. At 80°–100°C, cells using or positive‐electrode material and excess lithium show high material utilization at 0.5–1.0 mA/cm2 and can be cycled more than 250 times. Furthermore, a new family of polyether electrolytes has been found that allows room temperature (26°C) operation at 3–20 μA/cm2.