Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 693, Issue -, Pages 126-131Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.09.157
Keywords
Hydrogen storage alloy; High-energy ball milling; Graphene nanoplatelets; High-rate dischargeability
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Funding
- ChangBai Mountain Scholars Program
- Natural Science Foundation of Jilin Province [20160101315JC]
- Open Project of State Key Laboratory for Mechanical Behavior of Materials [20151707]
- Special Fund for Industrial Innovation in Jilin Province [2016C039]
- Graduate Innovation Fund of Jilin University [2016169]
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The poor high-rate dischargeability (HRD) of negative electrode materials (hydrogen storage alloys) has impeded applications of nickel metal hydride batteries in high-power fields, electric vehicles, hydride electric vehicles, power tools, modern military devices, etc. Here we report a facile and effective strategy to enhance the HRD performance of commercial MmNi(3.55)Co(0.75)Mn(0.4)Al(0.3) hydrogen storage alloy (here Mm denotes mischmetals) with high-energy ball milling and addition of graphene nanoplatelets (GNPs). At a discharge current density of 3000 mA g(-1), the capacity retention rate of the alloy electrode could reach 53.0% after ball-milling, and 68.3% after further addition of GNPs, which is 3.2 times that of original alloy electrode (21.5%). Such a superior HRD performance is contributed by (1) smaller particle size of alloys to reduce the diffusion distance of hydrogen atoms; (2) high conductivity of GNPs to accelerate the charge transfer; and (3) interconnected GNPs among alloys to decrease the internal resistance. (C) 2016 Elsevier B.V. All rights reserved.
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