Surface regulation of Si composite anode via synergistic coupling and TiC bond for stable cycling lithium-ion battery
Silicon holds bright promise as the anode material for next-generation lithium-ion batteries (LIBs). Unfortunately, it is limited by enormous volume expansion and fast capacity fading in long-cycling or large current density. Here, we propose an in-situ assembling path to form a stable Si nanocomposite by introducing bicontinuous TiO 2 -C layer and graphene nano-sheets, and further enhance the stability for long-term LIBs. The enhanced synergistic coupling of graphene and bicontinuous TiO 2 -C layer and introduced Ti C bond effectively improve long-cycling structural stability of Si nanocomposite for promising LIBs anode material. This anode material exhibits high capacity, long-term cycling and high-rate performance. Especially, it showed the high reversible capacities of 2147.6 mA h g −1 at 0.5 A g −1 after 800 cycles and 1328.2 mA h g −1 at 2 A g −1 after 500 cycles, which is much better than that of TiO 2 -C@Si and nano Si anodes. Moreover, the full cell including this composite anode and commercial LiFePO4 cathode exhibits a high capacity retention after 100 cycles. Our work demonstrates that this surface functionalization strategy can enhance synergistic coupling and introduce Ti C bond to regulate the stability of Si nanocomposite as long-cycling LIBs anode.
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