Abstract
CNT@SnO2@PPy nanocomposites were designed by combining liquid-phase deposition (LPD) and in-situ chemical-polymerization method for sodium-ion battery anodes. CNT@SnO2@PPy nanocomposites maintain one-dimensional structure of CNT in diameters of about 35–45 nm, moreover, the thickness of PPy coating is about 6–8 nm. Sandwiched CNT@SnO2@PPy electrode exhibits excellent rate capability and high capacity retention with a reversible capacity of 226 mAh g−1 after 100 cycles at the current density of 100 mA g−1. The improved electrochemical performance may be assigned to the synergistic effects among CNT, SnO2, and PPy. It may enhance electrical conductivity, avoid the pulverization of electrode material, and prevent the aggregation of Sn during the charge/discharge processes.
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