WS nanosheets@ZIF-67-derived N-doped carbon composite as sodium ion battery anode with superior rate capability.

Devising novel composite electrodes with particular structural/electrochemical characteristics becomes an efficient strategy to advance the performance of rechargeable battery. Herein, considering the homogeneous transition metal sulfide with N-doped carbon derived from zeolitic imidazolate framework-67 (ZIF-67) and WS with large interlayer spacing, a laurel-leaf-like CoS/WS@N-doped carbon bimetallic sulfide (CoS/WS@NC) is engineered and prepared via a step-by-step method. As an electrode material for sodium ion batteries (SIBs), CoS/WS@NC composite delivers high capacities of 480 and 405 mA h g at 0.