Hierarchical yolk-shell CNT-(NiCo)O/C microspheres prepared by one-pot spray pyrolysis as anodes in lithium-ion batteries
- Authors
- Oh, Se Hwan; Jo, Min Su; Jeong, Sang Mun; Kang, Yun Chan; Cho, Jung Sang
- Issue Date
- 15-7월-2019
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Yolk-shell; Spray pyrolysis; Lithium ion batteries; Anode materials; (Ni,Co)O solid solution
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.368, pp.438 - 447
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 368
- Start Page
- 438
- End Page
- 447
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/64099
- DOI
- 10.1016/j.cej.2019.02.144
- ISSN
- 1385-8947
- Abstract
- This paper presents a hierarchical yolk-shell-structured microsphere comprising a hierarchical carbon nanotube (CNT)-(NiCo) O/C yolk and an embossed hollow thin shell (hereafter denoted as CNT-(NiCo) O/C microsphere) prepared by a one-pot spray pyrolysis process for potential use as an anode in lithium-ion batteries. During spray pyrolysis, the hierarchical CNT-(NiCo) O/C yolk, whose frame is linked with CNTs, is formed by mutual binding of the CNTs and size-controlled polystyrene (PS) nanobeads and subsequent selective decomposition of these nanobeads. Further, phase separation of melted poly(vinylpyrrolidone) facilitates the formation of the hollow shell. The discharge capacity of the CNT-(NiCo) O/C microspheres after 1000 cycles at an extremely high current density of 5.0 A g(-1) is 598 mA h g(-1). The CNT-(NiCo) O/C microspheres show reversible discharge capacities of 886, 709, 509, and 294 mA h g(-1) at current densities of 0.5, 5, 20, and 50 A g(-1), respectively. The unique nanostructure of the CNT-(NiCo) O/C microspheres with high electrical conductivity promotes the transfer kinetics of electrons and Li+ ions, which consequently leads to their improved electrochemical performances.
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