Stable Sandwich-Like Biomass Carbon@MoS2 Composite Material with Enhanced Sodium Storage Performance

MoS2 has a unique two-dimensional (2D) layered structure, and it is considered to be one of the most promising anode materials for sodium-ion batteries (SIBs). However, the unsatisfactory structural stability and low electrical conductivity limit the development of MoS2. Therefore, it is still a great challenge to explore suitable MoS2-based anodes for SIBs. Herein, a sandwich-like carbon/MoS2 composite with excellent structural stability and high conductivity is designed and fabricated. MoS2 is grown on the surface of cellulose-derived carbon and the surface of MoS2 is coated with glucose-derived carbon, which is denoted as GC@MoS2@CC. The double-carbon encapsulation plays an important role in achieving good stability and high capacity. The double carbon layers not only help realize the reversible conversion of MoS2 and facilitate rapid electron/ion transfer and electrochemical reaction kinetics, but also effectively buffer the volume shrinkage and expansion of MoS2 during the charging/discharging processes. As expected, the GC@MoS2@CC electrode shows a high capacity (589 mA h g(-1) at 0.1 A g(-1) after 100 cycles) and an excellent rate capacity (411 mA h g(-1) at 1 A g(-1 )after 200 cycles) as a SIB anode. This work provides a novel strategy to improve the cycling performance via double-carbon encapsulation.