Journal
ELECTROCHIMICA ACTA
Volume 200, Issue -, Pages 59-65Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.03.171
Keywords
Hydrogen storage alloy; Reduced graphite oxide; High-rate dischargeability; Nickel metal hydride battery
Categories
Funding
- ChangBai Mountain Scholars Program
- Natural Science Foundation of Jilin Province [20160101315JC]
- Jilin University Basic Research Grants Program
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The main challenge of applications of nickel metal hydride batteries in high power fields, new-energy vehicles, power tools, military devices, etc., originates from poor high-rate dischargeability of their negative electrode material-hydrogen storage alloys (HSAs). Here we report the design and synthesis of a composite by coating HSAs with reduced graphite oxide (RGO) via a top-down route. The capacity retention rate of the fabricated HSAs/RGO hybrid electrode reaches 51.25% at a discharge current density of 3000 mA g (1), which is almost 4 times that of bare HSAs electrode (13.51%). Such an enhanced high-rate dischargeability performance is caused by (1) high specific surface area of RGO to increase active sites; (2) high conductivity of RGO to accelerate the charge transfer rate; and (3) unique interconnected RGO sheets among HSAs to reduce the internal resistance. (C) 2016 Elsevier Ltd. All rights reserved.
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