Structural engineering of SnS2/Graphene nanocomposite for high-performance K-ion battery anode

2019 
Abstract K-ion batteries (KIBs) are drawing increasing research interest as a promising supplement of Li-ion batteries due to the natural abundance of K resource. However, due to the large size of K + , high-capacity anodes are challenged by the structural stability of the active materials which are susceptible to large volumetric deformation after incorporating with a sufficient number of K + . Herein, using SnS 2 /graphene as an example, we demonstrated that high-performance KIBs anode could be achieved through collaborative efforts targeting on both the active material and the prepared electrode film. The electrochemically-active species of SnS 2 were controlled into small nanoparticles with their size below 5 nm to provide sufficient reactive sites for K + storage. Meanwhile, highly-resilient electrode film based on the prepared SnS 2 /graphene nanocomposite was built on aluminum (Al) current collector rather than the widely-used copper foil, forming a strong anode film with high peel strength to endure the potassiation/depotassiation process. In this way, the active species was able to deliver an extraordinary reversible capacity of 610 mAh g −1 with unprecedented high-rate capability (around 290 mAh g −1 at 2A g −1 ) and promising cycling stability. This contribution sheds light on the rational design of high-performance electrode for KIBs and beyond.
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