Issue 39, 2017

Hierarchical CoO microflower film with excellent electrochemical lithium/sodium storage performance

Abstract

Hierarchically nanostructured transition metal oxides are very attractive for electrochemical energy storage systems owing to the enhanced electrochemical performance induced by their unique microstructures. Herein, a hierarchical CoO microflower film is prepared by a low-temperature solvothermal method with subsequent annealing treatment. The CoO microflowers with an average size of about 6 μm consist of hexagonal nanosheets with a loose exterior layer, exhibiting a unique hierarchical micro–nanostructure. The hierarchical CoO microflower film electrode delivers a high capacity of 1297.9 mA h g−1 after 500 cycles at 454.5 mA g−1, manifesting superior lithium storage performance. The phenomenon of the lithium storage capacity increase during the initial 150 cycles is analyzed by comparing the galvanostatic discharge/charge voltage profiles at different cycles. For sodium storage, the CoO microflower film electrode shows a larger capacity of 277.8 mA h g−1 after 100 cycles at a current density of 90.9 mA g−1. Based on the physical characterization results of the cycled film electrodes, the sodium storage mechanism of CoO is clarified.

Graphical abstract: Hierarchical CoO microflower film with excellent electrochemical lithium/sodium storage performance

Supplementary files

Article information

Article type
Paper
Submitted
09 Jun 2017
Accepted
19 Sep 2017
First published
19 Sep 2017

J. Mater. Chem. A, 2017,5, 20892-20902

Hierarchical CoO microflower film with excellent electrochemical lithium/sodium storage performance

L. Chang, K. Wang, L. Huang, Z. He, S. Zhu, M. Chen, H. Shao and J. Wang, J. Mater. Chem. A, 2017, 5, 20892 DOI: 10.1039/C7TA05027E

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