Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2015
Título: Characterization of Spent Ni-MH Batteries
Autor: Cabral, Marta
Margarido, F.
Nogueira, C. A.
Palavras-chave: Ni-MH batteries
Recycling
Waste
Characterisation
Data: 2013
Editora: Trans Tech Publications
Citação: Cabral, M.; Margarido, F.; Nogueira, C.A. Characterization of Spent Ni-MH Batteries. In: Materials Science Forum, 2013, Vol. 730-732, p. 569-574
Resumo: Spent Ni-MH batteries are not considered too dangerous for the environment, but they have a considerable economical value due to the chemical composition of electrodes which are highly concentrated in metals. The present work aimed at the physical and chemical characterisation of spent cylindrical and thin prismatic Ni-MH batteries, contributing for a better definition of the recycling process of these spent products. The electrode materials correspond to more than 50% of the batteries weight and contain essentially nickel and rare earths (RE), and other secondary elements (Co, Mn, Al). The remaining components are the steel parts from the external case and supporting grids (near 30%) containing Fe and Ni, and the plastic components (<10%). Elemental quantitative analysis showed that the electrodes are highly concentrated in metals. Phase identification by X-ray powder diffraction combined with chemical analysis and leaching experiments allowed advancing the electrode materials composition. The cathode is essentially constituted by 6% metallic Ni, 66% Ni(OH)2, 4.3% Co(OH)2 and the anode consists mainly in 62% RENi5 and 17% of substitutes and/or additives such as Co, Mn and Al.
URI: http://hdl.handle.net/10400.9/2015
ISSN: 1662-9752
Versão do Editor: http://www.scientific.net/MSF.730-732.569
Aparece nas colecções:UEE - Artigos em revistas internacionais

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