Synthesis and electrochemical properties of spherical and hollow-structured NiO aggregates created by combining the Kirkendall effect and Ostwald ripening
- Authors
- Cho, Jung Sang; Won, Jong Min; Lee, Jong-Heun; Kang, Yun Chan
- Issue Date
- 2015
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.7, no.46, pp.19620 - 19626
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 7
- Number
- 46
- Start Page
- 19620
- End Page
- 19626
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/96298
- DOI
- 10.1039/c5nr05930e
- ISSN
- 2040-3364
- Abstract
- The Kirkendall effect and Ostwald ripening were successfully combined to prepare uniquely structured NiO aggregates. In particular, a NiO-C composite powder was first prepared using a one-pot spray pyrolysis, which was followed by a two-step post-treatment process. This resulted in the formation of micronsized spherical and hollow-structured NiO aggregates through a synergetic effect that occurred between nanoscale Kirkendall diffusion and Ostwald ripening. The discharge capacity of the spherical and hollowstructured NiO aggregates at the 500th cycle was 1118 mA h g(-1) and their capacity retention, which was measured from the second cycle, was nearly 100%. However, the discharge capacities of the solid NiO aggregates and hollow NiO shells were 631 and 150 mA h g(-1), respectively, at the 500th cycle and their capacity retentions, which were measured from the second cycle, were 63 and 14%, respectively. As such, the spherical and hollow-structured NiO aggregates, which were formed through the synergetic effect of nanoscale Kirkendall diffusion and Ostwald ripening, have high structural stability during cycling and have excellent lithium storage properties.
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