Electrochemical and structural study of the electrode of hydroxide of nickel modified with cerium for stabilization of the phase 945;-Ni(OH)2 / Estudo eletroquímico e estrutural do eletrodo de hidróxido de níquel modificado com cério para estabilização da fase α-Ni(OH0)2

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Ni(OH)2 is widely used as main active component for positive electrodes for secondary batteries such as Ni/Cd, Ni/Zn, Ni/Fe, Ni/H2 and recently in cell of Ni/MH. These accumulators show certain characteristics and they have several applications, such as: geostationary satellites, recharge feeding of computers, portable devices. Although the electrode of hydroxide of nickel have a good durability, after several oxidaction/reduction cycles, the material suffer modification from α-Ni(OH)2/β-NiOOH to β-Ni(OH)2/γ-NiOOH, decreasing its charge capacity. For this reason, it is necessary to study the role played by some additives for stabilization of charge capacity the electrode. Our results show that the cerium ions are incorporate in the electrode, stabilizing the α-Ni(OH)2 and therefore increasing charge capacity of the electrode. In the IV and Raman Spectroscopy analyses it was possible to verify structural modification caused by the presence of Ce3+ ions in the structure, mainly for 21,33% in mol of the additive. Potentiodynamic cycling experiments have shown that the phase α-Ni(OH)2 was stabilized with 21,33% of additive and the charge capacity of the electrode remains constant throughout 90 oxidation/reduction cycles.

ASSUNTO(S)

electrode of hydroxide of nickel eletrodo de hidróxido de níquel sabilization the α-ni(oh)2 electrode (study) charge capacity capacidade de carga eletroquimica electrochemistry baterias secundárias secondary batteries eletrodo (estudo) estabilização da fase ni(oh)2

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