An alkaline electrochemical cell containing a neat multiphase
thermoplastic polymer separator is disclosed. The microstructure and
composition of the polymer are selected to provide a film that can
physically endure the rigors of a cell assembly process and also provide
adequate ionic conductivity to support a high rate discharge. In one
embodiment, the ionic conductivity of the separator is improved upon
contact with the cell's alkaline electrolyte. Processes that can be used
to manufacture a cell of this invention are also described.