Citation: DUAN Song, ZHANG Lu-Lu, YANG Xue-Lin, PENG Gang, HUANG Yun-Hui, QIN Lei, LI Ming, NI Shi-Bing. Research on Two-Phase Carbon Modified Li2FeSiO4 as Cathode Material[J]. Chinese Journal of Inorganic Chemistry, ;2014, (2): 345-352. doi: 10.11862/CJIC.2014.038
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Two-phase carbon modified Li2FeSiO4 composites (Li2FeSiO4/(C+G)) were synthesized via solid-state reaction assisted with refluxing. Activated natural graphite was chosen as carbon source. The phase and the microstructure of Li2FeSiO4/(C+G) were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and Raman spectrometry (Raman). The effect of activated graphite content on the electrochemical performance of Li2FeSiO4/(C+G) was also investigated. The results show that activated graphite exists in Li2FeSiO4/(C+G) samples in the form of amorphous carbon as well as graphite crystallite. Li2FeSiO4/(C+G) composite prepared with 5wt% activated graphite achieved the excellent electrochemical performance with a higher initial discharge capacity of 170.3 mAh·g-1 and with a capacity retention ratio of 88.7% after 50 cycles.
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