A novel honeycomb-like WS2-x/CoS@C composite as anode for lithium ion batteries

Two-dimensional tungsten disulfide (WS2) is a promising anode material for lithium-ion batteries. The further development of WS2 is restricted by the defects of electrical conductivity and structural stability. Here, a bimetallic sulfide/carbon composite WS2-X/CoS@C was prepared by a facile one-step MOFs-engaged method. The WS2/CoS heterojunctions and sulfur vacancies were introduced into the material, which improved the electronic/ionic diffusion kinetics of the composite. A large number of honeycomb carbon nanotubes were formed on the surface of the composite, which could effectively increase the specific surface area and enhance the conductivity of the composite. The WS2-X/CoS@C electrode exhibited excellent electrochemical performance used as an anode for lithium-ion battery. The initial discharge capacity of the WS2-X/CoS@C delivered 936 mAh/g at 100 mA/g and retained high discharge capacity of 600 mAh/g at 200 mA/g after the 100 cycles.