期刊
SMALL
卷 13, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201702614
关键词
hydrothermal; lithium ion batteries; porous carbon; silicon; tin oxide
Silicon doped tin oxide embedded porous carbon microspheres (SiySn1-yOx@C) are synthesized. It is found that the doped Si not only improves the reversibility of lithiation/delithiation reactions, but also prevents Sn from aggregation. In addition, the doped Si introduces extra defects into the carbon matrix and produces Li+ conductive Li4SiO4, which accelerates Li+ diffusion. Together with the conductive, porous carbon matrix that provides void space to accommodate the volume change of Sn during charge/discharge cycling, the novel SiySn1-yOx@C exhibits excellent electrochemical performance. It shows a high initial columbic efficiency of 75.9%. A charge (delithiation) capacity of 880.32 mA h g(-1) is retained after 150 cycles, i.e., 91% of the initial capacity. These results indicate that the as-synthesized SiySn1-yOx@C is a promising anode material for lithium ion batteries.
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