LAUSR

One of the key challenges in the development of lithium-ion batteries is exploitation high-performance anode materials. In this paper, we report a micro-nano structured Si@SnS2-rGO composite in which silicon nanomaterial with the particle size of 30 nm is electrostatically anchored on 3D reduced graphene oxide (rGO) network and mixed with SnS2, the composite shows excellent cycling performance reported so far for Si-based and SnS2-based anodes. The step-wise lithiation/delithiation of SnS2 can provide nano-space limiting effects to accommodate volume expansion and particle aggregation, thereby alleviating the volume expansion of Si in the cycle as well as enhancing the structural stability, while the rGO in the 3D network stabilizes the stability of the composite. The composite obtained in this work manifests a high specific capacity of 1480.1 mAh g-1 after 200 cycles at the current density of 200 mA g-1. Meanwhile, it has high stability at the rate performance of 200-3000 mA g-1, and the capacity attenuation before and after the cycle is only 89.18%. It can circulate at least 600 cycles at the current density of 3000 mA g-1 and still get a stable specific capacity (425.5 mAh g-1) after cycling. Therefore, the micro-nanostructured Si@SnS2-rGO composite would be a new promising anode material that can be used in lithium ion batteries.