WS2–3D graphene nano-architecture networks for high performance anode materials of lithium ion batteries

Abstract

WS₂ nanoflakes were grown on three-dimensional graphene networks (3Dgn) synthesized via a simple chemical vapor deposition (CVD) method. As anode materials for lithium-ion battery applications, the 3Dgn network not only provides robust mechanical support for the WS₂ nanostructure, but also enhances its conductivity and ionic kinetics, leading to an overall improvement in electrochemical performance of WS₂ compared to the commercial WS₂ powder. The WS₂–3Dgn nanocomposites can deliver reversible capacities of 927 and 416 mA h g⁻¹ at current densities of 100 and 1500 mA g⁻¹, respectively. At current density of 200 mA g⁻¹, WS₂–3Dgn nanocomposites can retain a capacity of 748 mA h g⁻¹ after 500 cycles with Coulombic Efficiency (CE) higher than 98%, indicating outstanding cycling stability. The improved electrochemical performance is attributed to the synergistic effect between the WS₂ nanoflakes and the highly conductive 3Dgn network as well as their rationally designed nano-architecture. These results demonstrate a feasible and simple method to synthesize WS₂ based hybrid nanocomposites on 3Dgn for next generation high performance LIBs electrode materials.