期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 38, 期 25, 页码 10616-10624出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.06.005
关键词
Nickel-metal hydride battery; High-temperature performance; Sodium metaborate; Cycle stability
资金
- Natural Science Foundation of China [21071046]
- Henan Education Bureau Foundation of China [13A150507, 13A150512]
- Henan Provincial Department of Science and Technology Foundation of China [132300410294, 132300410299]
- Henan Key Science and Technology Program of China [132102210256]
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 degrees C). The charge acceptance of these Ni-MH batteries at 70 degrees C is over 96% at a charge/discharge rate of 1 degrees 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. Copyright (c) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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