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 shu

Research on Two-Phase Carbon Modified Li₂FeSiO₄ as Cathode Material

DUAN Song ¹ ,
ZHANG Lu-Lu ^1,, ,
YANG Xue-Lin ^1,, ,
PENG Gang ¹ ,
HUANG Yun-Hui ² ,
QIN Lei ¹ ,
LI Ming ¹ ,
NI Shi-Bing ¹

1.
1 College of Materials and Chemical Engineering, Three Gorges University, Yichang, Hubei 443002, China;

Corresponding author: ZHANG Lu-Lu, YANG Xue-Lin,
Received Date: 20 July 2013
Available Online: 30 September 2013
Fund Project:

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.
- cathode material;lithium iron silicate;activated graphite;electrochemical performance
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