Synthesis,characterization, and evaluation of unsupported porous NiS submicrometer spheres as a cathode material for lithium batteries |
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Authors: | Debajyoti Mondal Gilles Villemure Chaojie Song |
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Affiliation: | 1. Department of Chemistry, University of New Brunswick, Fredericton, NB, Canada 2. Energy, Mining and Environment, NRC, 4250 Wesbrook Mall, Vancouver, BC, V6T 1W5, Canada
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Abstract: | Synthesis of a nanostructured pure phase nickel sulfide in a single step is a challenge. In this work, a new method for direct synthesis of uniform NiS–SiO2 submicrospheres was developed by ultrasonic spray pyrolysis. Colloidal silica was used as a sacrificial template to create the porous structure. After silica removal, hollow, porous pure phase NiS nanospheres were obtained. The product was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy, and N2 adsorption/desorption isotherm. The results confirmed the formation of single phase millerite NiS porous nanospheres with a high surface area of 312 m2 g?1. The NiS spheres were tested as cathode for lithium batteries. A discharge capacity of 340 mAh g?1 with good capacity retention during multiple cycles was obtained. |
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