Confined WS Nanosheets Tubular Nanohybrid as High-Kinetic and Durable Anode for Sodium-Based Dual Ion Batteries.

Sodium based dual-ion battery (SDIB) has been regarded as one of the promising batteries technologies thanks to its high working voltage and natural abundance of sodium source, its practical application yet faces critical issues of low capacity and sluggish kinetics of intercalation-type graphite anode. Here, a tubular nanohybrid composed of building blocks of carbon-film wrapped WS nanosheets on carbon nanotube (WS /C@CNTs) was reported. The expanded (002) interlayer and dual-carbon confined structure endowed WS nanosheets with fast charge transportation and excellent structural stability, and thus WS /C@CNTs showed highly attractive electrochemical properties for Na storage with high reversible capacity, fast kinetic, and robust durability. The full sodium-based dual ion batteries by coupling WS /C@CNTs anode with graphite cathode full cell presented a high reversible capacity (210 mAh g at 0.1 A g ), and excellent rate performance with a high capacity of 137 mAh g at 5.0 A g .