Electrochemical characterisation of a Zn/(PEO)4ZnCl2/Nb2O5 solid-state cell |
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| Authors: | Maria Jo?o Carrilho Plancha Carmen Mireya Rangel César Augusto Correia de Sequeira |
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| Institution: | (1) Unidade de Pilhas de Combust?vel e Hidrog?nio, Laborat?rio Nacional de Energia e Geologia, Estrada do Pa?o do Lumiar 22, 1649–038 Lisbon, Portugal;(2) ICEMS-DEQB, Instituto Superior T?cnico, UT Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal |
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| Abstract: | The (PEO)4ZnCl2 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 °C) and 1.44 V
(150 °C) were estimated. Cyclic voltammetry studies using a Pt/(PEO)4ZnCl2/Pt cell indicated reversibility of the Zn2+/Zn couple at the electrode/electrolyte interface. Laboratory cells Zn(−)/(PEO)4ZnCl2/Nb2O5(+) were assembled and studied at 55 °C, under various discharge current densities. Results of cell discharge profiles, capacity
values, charge–discharge cycles and cell stabilities are reported. |
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