Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 6, Pages 2999-3006Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am3003654
Keywords
cobalt sulfides; solvothermal; carbon coating; dandelion; nanoparticles; LIB
Funding
- MOE (Singapore) [RG 31/08]
- Singapore Ministry of Education [MOE2010-T2-1-017]
- A*STAR SERC [1021700144]
- Singapore MPA [23/04.15.03]
- Singapore RDP [009/10/102, 020/10/113]
- [NRF2009EWT-CERP001-026]
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A novel solvothermal process was developed for the synthesis of carbon-coated Co9S8 nanodandelions using 1-dodecanethiol as the sulfur source and the soft template. Replacing 1-dodecanethiol with sulfur powder as the sulfur source leads to the formation of 20 nm Co9S8 nanoparticles without carbon coating. When tested as LIB anode, the C@ Co9S8 dandelion delivers a specific capacity of 520 mA h g(-1) at a current density of 1 A g(-1) (1.8 C) during the 50th cycle, which is much higher than that of Co9S8 nanoparticles (e.g. 338 mA h g(-1)). Furthermore, the C@Co9S8 dandelion also exhibits excellent high C-rate performance, e.g., depicts a 10th-cycle capacity of 373 mA h g(-1) at a current density of 6 A g(-1) (10.9 C), which is better than that of many reported anode materials. Such synthesis approach is attractive for the preparation of sulfide anode materials with high Li storage properties.
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