Double core-shell of Si@PANI@TiO2 nanocomposite as anode for lithium-ion batteries with enhanced electrochemical performance

摘要: Abstract A unique double core-shell structure of Si@PANI@TiO2 nanocomposite is synthesized by a simple in-situ growth method. The two shells polyaniline (PANI) and TiO2, hand in hand, play key role to improve the electrochemical performance: First, flexible properties effectively accommodate volume change Si during cycling. Second, good mechanical feature TiO2 can maintain structural integrity attenuate expansion cores. Finally, both lithiated enhance conductivity Si, which promotes electrons transport. Resulting exhibits remarkable synergy large, reversible lithium storage, delivering capacity as high 1027 mAh g−1 after 500 cycles superior rate 640 mAh g−1, at current 4000 mA g−1, respectively. This excellent cycling high-rate capability be ascribed well-designed with synergistic effect between TiO2.