Influence of Na+, K+, Mn2+, Fe2+ and Zn2+ ions on the electrodeposition of Ni-Co alloys: Implications for the recycling of Ni-MH batteries

[摘要] A hydrometallurgical recycling procedure for the recovery of a mixed rare earths sulfate and an electrodeposited Ni-Co alloy has been described. The latter step was found to be complex, due to the presence of several ions in the battery electrode materials. Electrochemical evaluation of the influence of the ions on the Ni-Co alloy deposition was carried out by cyclic voltammetry test. It was found that ions such as K+, Fe2+and Mn2+improved the current efficiency for the Ni-Co deposition process on a copper surface. On the other hand, Na+and Zn2+ions exhibited a deleterious behaviour, minimizing the values of the reduction current. The results were used to suggest the inclusion of additional steps in the process flow diagram of the recycling operation, in order to eliminate deleterious ions from the electroplating solution.

[发布机构] Universidad Industrial de Santander, Bucaramanga, Colombia^1;Universidad Simón Bolívar, Caracas, Venezuela^2

[效力级别] 化学

[关键词] Battery electrode;Copper surface;Current efficiency;Electrochemical evaluations;Mixed rare earth;Process flow diagrams;Recycling operations;Reduction current