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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
Author
황장연
Keywords
NiCo2O4; Anode materials; Sodium ion battery; Conversion materials; Microspheres
Issue Date
2017-12
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v. 258, page. 220-227
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
https://www.sciencedirect.com/science/article/pii/S0013468617322363?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/116641
ISSN
0013-4686; 1873-3859
DOI
10.1016/j.electacta.2017.10.114
Appears in Collections:
CENTER FOR CREATIVE CONVERGENCE EDUCATION[S](창의융합교육원) > ETC
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