Hierarchical Cobalt‐Based Metal–Organic Framework for High‐Performance Lithium‐Ion Batteries

In the present work, a simple solvothermal method is developed for the synthesis of hierarchical Co‐based metal–organic framework (H‐Co‐MOF) microflowers. These microflowers are composed of nanosheets, consisting of small nanoflakes. Upon application as an electrode material in Li‐ion batteries, H‐Co‐MOF shows ultrahigh specific capacity and long cycling performance. For instance, a remarkably superior capacity of 1345 mA h g −1 can be achieved after 100 cycles at a current density of 0.1 A g −1 . Even at 2 A g −1 , a large capacity of 828 mA h g −1 is maintained after 700 cycles. This excellent electrochemical performance might be ascribed to the intrinsic properties and unique hierarchical structure of the Co‐based MOF.