Self-assembled nickel-cobalt oxide microspheres from rods with enhanced electrochemical performance for sodium ion battery
- Authors
- Islam, Mobinul; Jeong, Min-Gi; Hwang, Jang-Yeon; Oh, In-Hwan; Sun, Yang-Kook; Jung, Hun-Gi
- Issue Date
- Dec-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- NiCo2O4; Anode materials; Sodium ion battery; Conversion materials; Microspheres
- Citation
- ELECTROCHIMICA ACTA, v.258, pp.220 - 227
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 258
- Start Page
- 220
- End Page
- 227
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/5334
- DOI
- 10.1016/j.electacta.2017.10.114
- ISSN
- 0013-4686
- 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).
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