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) CoZnSx@N-doped Carbon (L-Co2Zn1-S) to address this problem. The different distribution of Zn2+ and Co2+ will greatly influence the morphology of products. L-Co2Zn1-S displays great cycling performance of specific capacity of 527mA h g(-1) at 0.5 A g(-1) after 200 cycles with Coulombic efficiency of about 99% and excellent rate capability as lithiumion 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. (c) 2019 Elsevier B.V. All rights reserved.