Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6605519 | Electrochimica Acta | 2016 | 34 Pages |
Abstract
A novel Co3O4 nanoparticles (NPs)/exfoliated graphite (EG) composite has been prepared through a stirring-assistant hydrothermal route and a subsequent post-anneal treatment. Results of microstructure characterizations of XRD, FE-SEM and HR-TEM analyses indicate that high-crystallized Co3O4-NPs with a dimension of â¼5Â nm are homogenously anchored on the nanosheets of EG in the form of tiny agglomerates of â¼20Â nm. Restack and shrinkage of the edge regions of EG are distinctly observed after suffering from the hydrothermal process, which exerts a positive influence over the decay-free cycling ability of the Co3O4-NPs/EG electrode. The reversible capacity increases with cycling, and reaches 1183 mAhgâ1 (94th cycle) at 100 mAgâ1 and 739 mAhgâ1 (100th cycle) at 1000 mAgâ1. After suffering from 800 cycles at 2000 mAgâ1 and resetting to 100 mAgâ1, the charge capacity recovers to as high as 1225 mAhgâ1 immediately, and stabilizes in the following cycles. The decay-free cycling performances and good rate capability are ascribed to the favorable synergistic effect between Co3O4-NPs and the robust/conductive skeleton of EG. In addition, an exceeded capacity which much surpasses the calculated theoretical value is achieved, further proving the good synergistic enhancement due to the high-effective integration between Co3O4-NPs and EG.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Yun Zhao, Yong Li, Canliang Ma, Zongping Shao,