Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 2, Pages 767-773Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp407185p
Keywords
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Funding
- National Natural Science Foundation of China [51062018, 51262031]
- Natural Science Foundation of Yunnan [2010FXW004]
- Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province [2010UY08, 2011UY09]
- Yunnan Provincial Innovation Team [2011HC008]
- Education Department foundation of Yunnan Province [2013J006]
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An alternative electrodeposition technology, which provides an efficient way to complete a better interface contact between electroactive materials and metal foil substrates, was used to prepare Ni3S2/Ni composites in aqueous solutions contained thiourea (TU). The deposition parameters, such as time and TU concentration, were optimized. Surface morphology, chemical composition, and crystal structure of Ni3S2/Ni composites were analyzed using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD), respectively. A Ni3S2/Ni composite, which consisted of submicrometer grains with size in the range of 0.2-2 mu m, was obtained. Galavostatic battery testing shows that the submicrometer Ni3S2/Ni-4 composites as cathodes for lithium batteries exhibit a high specific capacity of 338 mAh g(-1) at a current density of 0.17 A/g (similar to 0.6 C), extraordinary capacity retention as well as 95.3% after 100 cycles, and outstanding rate performance, for example, still delivering 180 mAh g(-1) at 1.7 A g(-1) (similar to 6 C). The performances may benefit from their miscellaneous submicrometer structures and subsequently formed tremella-like structures during discharge/charge cycles.
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