Abstract
Phase equilibria in the ternary Li2O–FeO–SiO2 system have been studied by means of X-ray powder diffraction. The experimental results show that no new lithium ferrous silicate compounds can be found in our experimental condition which may be a candidate cathode material for LIBs. The Li2O–FeO–SiO2 system can be characterized by the existence of 9 three-phase regions. In Li2O–SiO2 binary system, Li2SiO3 and Li4SiO4 are purely synthesized by solid-state reactions; other new information includes the electrochemical properties of Li2SiO3 and Li4SiO4 compounds, where the electrochemical test indicated that initial discharge-specific capacities can reach to 136 and 129 mAhg−1, respectively. Enhanced performance was exhibited after carbon coating. The initial discharge-specific capacities of carbon-coated Li2SiO3 and carbon-coated Li4SiO4 compound can reach to 230 and 220 mAhg−1 respectively. Our results show that Li2SiO3 and Li4SiO4 samples have better capacity retention except for the first discharge. No significant change can be seen in ex situ XRD patterns for Li2SiO3/C, while the lithium-ion insertion/extraction reaction may exist in Li4SiO4/C as forming solid solutions (nominated Li4+x SiO4).
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This work was funded by NSFC Grant supported through NSFC Committee of China (Nos. 51172077 & 51372089), the Foundation supported through the Science and Technology Bureau of Guangdong Government (No. S2011020000521).
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Yan, D., Geng, X., Zhao, Y. et al. Phase relations of Li2O–FeO–SiO2 ternary system and electrochemical properties of Li x Si y O z compounds. J Mater Sci 51, 6452–6463 (2016). https://doi.org/10.1007/s10853-016-9943-2
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DOI: https://doi.org/10.1007/s10853-016-9943-2