Synthesis of Honeycomb-Like Co3S4/MoS2Composites with Hollow Structure As Anode Materials for High-Performance Lithium-Ion and Sodium-Ion Batteries

Hollow honeycomb-like Co3S4/MoS(2)composites were fabricated through the zeolitic imidazolate framework-67 (ZIF-67) as a precursor and followed by two sulfuration processes. Co(3)S(4)hollow nanocubes were first prepared using ZIF-67 and thioacetamide co-pyrolysis. Then, MoS(2)nanosheets were grown on the surface of Co(3)S(4)nanocubes and formed Co3S4/MoS(2)hollow composites. The outside flake-like MoS(2)interlaced together, thus formed a honeycomb-like structure. The combination of Co(3)S(4)and MoS(2)significantly improved the electrochemical performance compared with single Co(3)S(4)or MoS2. The presence of honeycomb-like MoS(2)not only stabilized the structure of inner Co(3)S(4)nanocubes to the maximum extent during the discharge/charge process, but also supplied more Li(+)and Na(+)insertion/extraction sites, increased the contact area between electrode material and electrolyte, and restrained volume expansion of inner Co(3)S(4)nanocubes. The capacity of the Co3S4/MoS(2)was maintained at 365 mAh g(-1)during 1000 cycles at 1 A g(-1)when used as anode material in lithium-ion batteries. At even a higher current density of 2 A g(-1), the capacity of the Co3S4/MoS(2)stabilized at 248 mAh g(-1)during 1000 cycles. When used as anode material in sodium-ion batteries, it still has a capacity of 230 mAh g(-1)at 1 A g(-1), which is superior to that of the single Co(3)S(4)nanocubes. Co3S4/MoS(2)composites exhibited enhanced capacity and excellent cycling performance due to its complementarity, hollow structure and synergetic effect between Co(3)S(4)and MoS2.