Publication Type
Abstract
Overcharge protection for 4 V Li1.05Mn1.95O4/lithium cells at charging rates in excess of 1 mA/cm2 (3C) and at temperatures of as low as −20°C was achieved using a bilayer separator coated with two electroactive polymers. High rate and low temperature overcharge protection and discharge performance were improved by employing a design in which the polymer-coated portion of the separator is in parallel with the cell rather than between the electrodes. The effects of different membrane supports for the electroactive polymers were also examined.