Leaf-shaped bimetallic sulfides@N-doped porous carbon as advanced lithium-ion battery anode

Transition metal sulfides have attracted wide attention in energy storage, especially in Li-ion batteries anodes due to the high theoretical capacity and low cost. However, their poor stability and rate performance have hindered their further development. Here, leaf-shaped ZIF (zeolitic imidazole framework) was used as precursor to prepare two-dimensional (2D) CoZnS x @N-doped Carbon (L-Co 2 Zn 1 -S) to address this problem. The different distribution of Zn 2+ and Co 2+ will greatly influence the morphology of products. L-Co 2 Zn 1 -S displays great cycling performance of specific capacity of 527 mA h g −1 at 0.5 A g −1 after 200 cycles with Coulombic efficiency of about 99% and excellent rate capability as lithium-ion battery anode. This superior electrochemical performance can be ascribed to 2D N-doped carbon structure and synergistic effect of bimetallic sulfide. This work not only casts a new light on the design of bimetallic sulfides but also provides a manufacturing method of 2D carbon matrix.