Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7722479 | International Journal of Hydrogen Energy | 2013 | 9 Pages |
Abstract
In this paper, an alternative approach to improve the high-temperature performance of nickel-metal hydride (Ni-MH) batteries is proposed by introducing NaOH electrolyte with sodium metaborate (NaBO2) additives. Compared with conventional batteries using KOH electrolyte, the in-house prepared batteries with proposed electrolytes exhibit an enhanced discharge capacity, improved high-rate discharge ability, increased cycle stability and reduced self-discharge rate at an elevated temperature (70 °C). The charge acceptance of these Ni-MH batteries at 70 °C is over 96% at a charge/discharge rate of 1 C. These performance improvements are ascribed to the increased oxygen evolution overpotential, slower oxygen evolution rate and lower electrochemical impedance, as indicated by CV, steady-state polarization measurements and EIS. The results suggest that the proposed approach be an effective way to improve the high-temperature performance of Ni-MH batteries.
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Authors
Enbo Shangguan, Jianling Wang, Jing Li, Guo Dan, Zhaorong Chang, Xiao-Zi Yuan, Haijiang Wang,