Three-dimensional interwoven CoS2/reduced graphene oxide/carbon nanotubes composite as anode materials for high-performance lithium-ion batteries

CoS 2 exhibits abundant redox reactions , high theoretical capacity, excellent, mechanical properties, and is regarded as a prospective electrode material. However, rational design of CoS 2 composites with high capacity and ultra-long cycle life remains a major challenge. In this work, we formed CoS 2 /rGO/CNT electrode materials by compositing reduced graphene oxide (rGO), carbon nanotubes (CNT) and CoS 2 with a three-dimensional interwoven network. The elemental composition and three-dimensional network morphology were described using SEM, TEM, XRD , Raman, BET, TGA and XPS. The large loading area provided by the three-dimensional network for Li + facilitates the effective diffusion of Li + during the cycling process. In addition, the three-dimensional network acts as an adhesion substrate for CoS 2 nanoparticles , mitigating the bulk change and reducing the aggregation of CoS 2 nanoparticles. On the other hand, the tight bonding of CNT with CoS 2 /rGO facilitates fast transfer of electron in CoS 2 /rGO/CNT. The electrochemical measurement results show that after 1000 cycles, the capacity is 615.8 mAh/g at 2000 mA/g and can still reach 233.7 mAh/g at 5000 mA/g after 2000 cycles. The favorable electrochemical properties prove that CoS 2 /rGO/CNT is an excellent anode material for long-life lithium-ion batteries.