2D MXene/SnS2 composites as high-performance anodes for sodium ion batteries

Abstract

MXenes, 2D transition metal carbides and nitrides, deliver competitive performance in sodium ion batteries because of metallic conductivity, hydrophilic surface and good mechanical stability. However, similar to other individual 2D materials, the electrochemical performance of MXenes was hindered by the modest capacity and the tendency of restacking. To overcome these limitations, construction heterolayered architecture with 2D high capacity SnS2 nanoplates is an effective strategy. The heterolayered electrode combined the metallic conductive of MXene and high redox activity SnS2 can achieve a synergistic enhancement. When used as anodes for sodium ion batteries, the MXene/SnS2 composite exhibited a great performance in term of capacity, rate capability, and cycling stability. A superior cycling could still obtain at extreme temperature that MXene/SnS2 5:1 electrode maintain a reversible capacity of 120mAhg−1 after 125 cycles at 0°C.