期刊
CHEMISTRY OF MATERIALS
卷 25, 期 7, 页码 1024-1031出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm302823f
关键词
Li2CoSiO4; cathode; nanospheres
资金
- NSERC
- GM (Canada)
A highly ordered mesoporous carbon/silica (MCS) framework was used as both a silicate precursor and carbon source to prepare Li2CoSiO4/carbon nanocomposites via hydrothermal synthesis. TEM-EDX and TGA measurements showed that similar to 2 wt % carbon was incorporated within Li2CoSiO4 crystal aggregates on the nanoscale. We find that both the morphology and particle size of the Li2CoSiO4/C composites are significantly influenced by the LiOH concentration in the precursors. By controlling the molar ratio of LiOH:Si:Co = 8:1:1, very uniform Li2CoSiO4/C spheres were obtained with an average diameter of 300-400 nm. Many exhibit hollow or core-shell structures. A mechanism is proposed to account for both the unusual morphology and carbon incorporation. Despite some electrolyte oxidation at high potential, the electrochemical properties of the Li2CoSiO4/C composites showed that the nanocarbon played an important role in enhancing the electrochemical performance, when compared with Li2CoSiO4 prepared using fumed silica as the silicate source under similar conditions.
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