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Toward Rapid‐Charging Sodium‐Ion Batteries using Hybrid‐Phase Molybdenum Sulfide Selenide‐Based Anodes

To attain both high energy density and power density in sodium‐ion (Na+) batteries, the reaction kinetics and structural stability of anodes should be improved by materials optimization. In this work, few‐layered molybdenum sulfide selenide (MoSSe) consisting of a mixture of 1T and 2H phases is designed to provide high ionic/electrical conductivities, low Na+ diffusion barrier, and stable Na+ storage. Reduced graphene oxide (rGO) is used as a conductive matrix to form 3D electron transfer paths. The resulting MoSSe@rGO anode exhibits high capacity and rate performance in both organic and solid‐state electrolytes. The ultrafast Na+ storage kinetics of the MoSSe@rGO anode is attributed to the surface‐dominant reaction process and broad Na+ channels. In situ and ex situ measurements are conducted to reveal the Na+ storage process in MoSSe@rGO. It is found that the MoS and MoSe bonds effectively limit the dissolution of the active materials. The favorable Na+ storage kinetics of the MoSSe@rGO electrode are ascribed to its low adsorption energy of −1.997 eV and low diffusion barrier of 0.087 eV. These results reveal that anion doping of metal sulfides is a feasible strategy to develop sodium‐ion batteries with high energy and power densities and long life‐span.