Electrochemical characterisation of a Zn/(PEO)4ZnCl2/Nb2O5 solid-state cell

The (PEO)(4)ZnCl2 electrolyte (PEO, polyethylene oxide) was studied in view of its potential application in a solid-state rechargeable zinc cell. The electrochemical stability window was established, and decomposition voltage values between 3.19 (20 degrees C) and 1.44 V (150 degrees C) were estimated. Cyclic voltammetry studies using a Pt/(PEO)(4)ZnCl2/Pt cell indicated reversibility of the Zn2+/Zn couple at the electrode/electrolyte interface. Laboratory cells Zn(-)/(PEO)(4)ZnCl2/Nb2O5(+) were assembled and studied at 55 degrees C, under various discharge current densities. Results of cell discharge profiles, capacity values, chargedischarge cycles and cell stabilities are reported.