Capacitive properties of reduced graphene oxide microspheres with uniformly dispersed nickel sulfide nanocrystals prepared by spray pyrolysis
- Authors
- Lee, Su Min; Ko, You Na; Choi, Seung Ho; Kim, Jong Hwa; Kang, Yun Chan
- Issue Date
- 10-6월-2015
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- graphene composite; nickel sulfide; lithium ion battery; anode material; spray pyrolysis
- Citation
- ELECTROCHIMICA ACTA, v.167, pp.287 - 293
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 167
- Start Page
- 287
- End Page
- 293
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/93272
- DOI
- 10.1016/j.electacta.2015.03.196
- ISSN
- 0013-4686
- Abstract
- Nickel sulfide-reduced graphene oxide (RGO) composite powders with spherical shapes are prepared by a one-pot spray pyrolysis process. The optimum mole ratio of nickel nitrate and thiourea to obtain nickel sulfide-RGO composite powders with high initial capacities and good cycling performance is 1:8. The bare nickel sulfide and nickel sulfide-RGO composite powders prepared directly by spray pyrolysis have mixed crystal structures of hexagonal alpha-NiS and cubic Ni3S4 phases. The bare nickel sulfide powders are prepared from the spray solution without graphene oxide sheets. The nickel sulfide-RGO composite powders have sharp mesopores approximately 3.5 nm in size. The discharge capacities of the nickel sulfide-RGO composite powders for the 1st and 200th cycles at a current density of 1000 mA g (1) are 1046 and 614 mA h g (1), respectively, and the corresponding capacity retention measured from the second cycle is 89%. However, the discharge capacities of the bare nickel sulfide powders for the 1st and 200th cycles at a current density of 1000 mA g (1) are 832 and 16 mA h g (1), respectively. The electrochemical impedance spectroscopy (EIS) measurements reveal the high structural stability of the nickel sulfide-RGO composite powders during cycling. (C) 2015 Elsevier Ltd. All rights reserved.
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