Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6610812 | Electrochimica Acta | 2015 | 8 Pages |
Abstract
We report a simple microwave-assisted method to fabricate high-quality two-dimensional (2D) ultrathin NiCo2O4 nanosheets with a geometrically graphene-like architecture. The unique large-area nanostructures represent an ultrahigh surface atomic ratio with almost all active elements exposed outside for surface-dependent electrochemical reaction processes. Experimental results reveal that the as-synthesized ultrathin NiCo2O4 nanosheets show excellent electrochemical performances for lithium storage application. The ultrathin NiCo2O4 nanosheets could deliver a high first discharge capacity (1287.1 mAh gâ1) with initial Coulombic efficiency of 80.0% at 200 mA gâ1 current density. The reversible lithium storage capacity still retains at 804.8 mAh gâ1 in the 100th cycle, suggesting a good cycling stability. The excellent electrochemical properties of the as-synthesized NiCo2O4 nanosheets could be ascribed to the unique ultrathin 2D architecture, which could offer large exposed active surface with more lithium-insertion channels and significantly reduce lithium ion diffusion distance. The cost-efficient synthesis and excellent lithium storage properties make the 2D NiCo2O4 nanosheets as a promising anode material for high-performance lithium ion batteries.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Youqi Zhu, Chuanbao Cao,