Abstract
Constructing a layered transitional metal chalcogenide (TMC) materials with high specific capacity and execellent rate performance for Li-ion batteries (LIBs) remains a touch challenge. Here in, an “Anti-Oriented-Attachment” growth mechanism is proposed to design the graphene-based vertically aligned Co0.85Se nanoarrays (CoSeNAs@G). The CoSeNAs@G owns highly exposed edge sites and shorter lamella size, providing more transport channels for fast Li-ion transfer. At the same time, graphene as a matrix can improve the conductivity and accommodate to the volume expansion during charge and discharge. When used as an anode material for LIBs, CoSeNAs@G composite exhibits a high reversible specific capacity of 675 mAh g−1 at 100 mA g−1. When the current density is increased by 20 times (2000 mA g−1), the specific capacity keeps at 492 mAh g−1 with a retention of 73%, demonstrating an excellent rate performance. Even after 300 cycles at 1000 mA g−1, CoSeNAs@G composite still delivers a specific capacity of 561 mAh g−1. Additionaly, the CoSeNAs@G composite exhibits a promising potential as anode candidate in the full LIBs.
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