ZnO nanoparticles encapsulated in a 3D hierarchical carbon framework as anode for lithium ion battery

•A novel structure that ZnO nanoparticles encapsulated in a 3D hierarchical carbon framework (ZnO@CF) has been fabricated.•The ZnO@CF is prepared through a simple hydrothermal method and subsequent post-processes.•The ZnO@CF exhibits very high initial discharge capacity.•The ZnO@CF exhibits excellent cycling stability and good rate capability. [Display omitted] A novel structure that ZnO nanoparticles encapsulated in a 3D hierarchical carbon framework (ZnO@CF) has been fabricated through hydrothermal method and subsequent post-processes. In this structure, the surface carbon coating layer combines with the inside carbon to form a stable 3D carbon framework that encapsulated and anchored the ZnO nanoparticles. The developed ZnO@CF structure can not only improve electronic conductivity, but also alleviates the structural strain associated with repeating Li+ insertion/extraction processes so as to maintain structural stability. When used as anode for lithium ion battery, the ZnO@CF electrode exhibits a high reversible capacity of 850mAhg−1 at a current density of 0.1Ag−1 after 200 cycles. Moreover, it shows good rate capability even when cycled at 2Ag−1.