Te-doping induced C@MoS2-xTex@C nanocomposites with improved electronic structure as high-performance anode for sodium-based dual-ion batteries

Sodium-ion batteries and Sodium dual-ion batteries have attracted much attention owing to low cost, abundant sodium resources, and environmental friendliness. However, it is an urgent problem to explore suitable anode materials with high performance. Herein, MoS2 nanosheets grown on one-dimensional tubular carbon have been designed by Te atom doping and double carbon coating process, which provides optimized internal electronic structure, improved Na+ reaction kinetics, expanded interlayers space, increased active sites, and enough void space for improving conductivity and alleviating volume variation upon Na+ intercalation/de-intercalation. As a synergetic result, the special C@MoS(2-x)Tex@C nanocomposites favor Na+ storage, manifesting a superior cyclic stability and rate performance. Therefore, the sodium ion half batteries show a reversible discharge capacity of 365.3 mAh g(-1) at 1 A g(-1) after 300 cycles. And the sodium dual-ion full batteries exhibit a reversible discharge capacity of 127.2 mAh g(-1) at 1 A g(-1) over the voltage range of 1.0-4.4 V after 350 cycles.

Automated summary

Sodium-ion batteries and Sodium dual-ion batteries have received much attention due to their low cost, abundant sodium resources, and environmental friendliness. In this study, a new type of anode material was designed by Te atom doping and double carbon coating process, which significantly improved the performance and cyclic stability of sodium-ion batteries.