Abstract
Seeking a general and facile method to prepare the nanocomposite of metal and carbon is the key to develop the metal-based anode in sodium ion battery. Here, a simple soft chemistry method followed by carbonization process is reported to prepare Bi(Sn)/N-doped carbon nanocomposites (denoted as Bi/NC and Sn/NC). The conductive carbon layer effectively hinders the volume effect during sodiation/desodiation process. Thus, Bi/NC and Sn/NC exhibit an outstanding rate capability of 220 and 158 mAh g−1 at 3.0 A g−1 and a long cyclic stability (negligible capacity fading after 2000 cycles for Bi/NC and 86.4% capacity retention after 1000 cycles for Sn/NC at 1.0 A g−1).
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