Self-assembled nickel-cobalt oxide microspheres from rods with enhanced electrochemical performance for sodium ion battery

Title
Self-assembled nickel-cobalt oxide microspheres from rods with enhanced electrochemical performance for sodium ion battery
Authors
오인환정훈기정민기모비눌황장연선양국
Keywords
NiCo2O4; Anode materials; Sodium ion battery; Conversion materials; Microspheres
Issue Date
2017-12
Publisher
Electrochimica acta
Citation
VOL 258-227
Abstract
Exploring new anode materials with promising electrochemical capacity is essential for rechargeable sodium-ion batteries. The selection and structural design of electrode materials play key role in the development of a viable battery with high specific capacity and cycle retention. Herein, self-assembled NiCo2O4 microspheres comprised of numerous sub-micron sized rods are prepared for the first time by a simple co-precipitation method. The synthesized microspheres have homogeneous morphology and a multimodal porosity. The resulting sodium ion storage properties demonstrate that the NiCo2O4 microsphere anode offers excellent electrochemical performance, with a high reversible capacity of 620 mAh g− 1 at a current density of 0.05 A g− 1. It also shows an exceptionally high rate capability up to 10 A g− 1 equivalent to 11 C-rate, which can be attributed to the existence of capacitive behavior. Notably, the rate performance and cycling stability are significantly higher than most previously reported results of NiCo2O4 nanostructures for sodium-ion batteries (SIBs).
URI
http://pubs.kist.re.kr/handle/201004/66428
ISSN
0013-4686
Appears in Collections:
KIST Publication > Article
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