Yolk-shell-structured microspheres composed of N-doped-carbon-coated NiMoO4 hollow nanospheres as superior performance anode materials for lithium-ion batteries
- Authors
- Park, Gi Dae; Hong, Jeong Hoo; Lee, Jung-Kul; Kang, Yun Chan
- Issue Date
- 14-1월-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.11, no.2, pp.631 - 638
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 11
- Number
- 2
- Start Page
- 631
- End Page
- 638
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/68302
- DOI
- 10.1039/c8nr08638a
- ISSN
- 2040-3364
- Abstract
- Novel yolk-shell-structured microspheres consisting of N-doped-carbon-coated metal-oxide hollow nanospheres are designed as efficient anode materials for lithium-ion batteries and synthesized via a spray pyrolysis process. A NiMoO4 yolk-shell architecture formed via spray pyrolysis is transformed into equally structured NiSe2-MoSe2 composite microspheres. Because of the complementary effect between the Ni and Mo components that prevents severe crystal growth during selenization, NiSe2-MoSe2 nanocrystals are uniformly distributed over the yolk-shell structure. Then, the yolk-shell-structured NiSe2-MoSe2 microspheres are oxidized, which yields microspheres composed of NiMoO4 hollow nanospheres by nanoscale Kirkendall diffusion. Uniform coating with polydopamine and a subsequent carbonization process produce uniquely structured microspheres consisting of N-doped-carbon-coated NiMoO4 hollow nanospheres. The discharge capacity of the yolk-shell-structured NiMoO4-C composite microspheres for the 500(th) cycle at a current density of 3.0 A g(-1) is 862 mA h g(-1). In addition, the NiMoO4-C composite microspheres show a high reversible capacity of 757 mA h g(-1) even at an extremely high current density of 10 A g(-1). The synergetic effect between the hollow nanospheres comprising the yolk-shell structure and the N-doped carbon coating layer results in the excellent lithium-ion storage performance of the NiMoO4-C composite microspheres.
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