Metal–organic framework-engaged synthesis of core–shell MoO2/ZnSe@N-C nanorods as anodes in high-performance lithium-ion batteries†
Abstract
Searching for novel alternatives to the traditional graphite anode in high performance lithium-ion batteries is of great significance, which, however, faces many challenges. In this work, pyrolysis coupled with a selenization strategy was adopted to synthesize a one-dimensional core–shell nanorod composite (MoO2/ZnSe@N-C) by using zeolitic-imidazole framework coated molybdenum trioxide as a precursor. The as-obtained material comprises a zinc selenide loaded molybdenum dioxide core and a nitrogen-doped carbon shell, which can enhance the specific capacity through conversion reactions and buffer the volume change as well as promote the electrical conductivity, respectively. When used as an anode in lithium-ion batteries, the optimized MoO2/ZnSe@N-C sample delivers a high specific capacity (807 mA h g−1 at 100 mA g−1 for 100 cycles) with a coulombic efficiency up to 99%, a good rate capability, and long-term cycling stability for 900 cycles at 500 mA g−1 which is better than that of MoO3 and ZIF-8 derived materials. In addition, the lithium storage mechanism was analyzed by cyclic voltammetry at various scanning rates and the result indicates that the capacitive-controlled behavior dominates the Li+ ion transport kinetics process.
Please wait while we load your content...
