Double core-shell of Si@PANI@TiO2 nanocomposite as anode for lithium-ion batteries with enhanced electrochemical performance. (8th November 2018)

• Record Type: Journal Article
• Authors: Gu, Zhiqiang; Liu, Chan; Fan, Runyu; Zhou, Zan; Chen, Yuxi; He, Yuede; Xia, Xiaohong; Wang, Zhiyong; Liu, Hongbo
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 45(2018)
• Page Start: 20843
• Page End: 20852
• Publication Date: 2018-11-08
• Subjects: Double core-shell nanostructure -- TiO2 coating -- Electrochemical performance -- Lithium ion batteries; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.09.105
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A unique double core-shell structure of Si@PANI@TiO2 nanocomposite is synthesized by a simple in-situ growth method. The two shells of polyaniline (PANI) and TiO2, hand in hand, play a key role to improve the electrochemical performance: First, the flexible properties of polyaniline (PANI) effectively accommodate the volume change of Si during the cycling. Second, the good mechanical feature of TiO2 can maintain the structural integrity and attenuate the volume expansion of Si cores. Finally, both of polyaniline and the lithiated TiO2 enhance the conductivity of Si, which promotes the electrons transport. Resulting in the Si@PANI@TiO2 double core-shell nanocomposite exhibits remarkable synergy in large, reversible lithium storage, delivering a reversible capacity as high as 1027 mAh g −1 after 500 cycles and a superior rate capacity of 640 mAh g −1, at a current of 500 and 4000 mA g −1, respectively. This excellent cycling and high-rate capability can be ascribed to the unique and well-designed double core-shell structure with the synergistic effect between polyaniline (PANI) and TiO2 . Graphical abstract: Highlights: Double core-shell of Si@PANI@TiO2 was prepared by a simple in-situ growth method. PANI and TiO2 shell played the important role for buffering the volume expansion of SiO2 . TiO2 shell maintain the integrity of the material structure. PANI and the Lithiated TiO2 improved the conductivity of Si. Excellent cycling stability and superior rate capacity were demonstrated.