Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 15, Pages 5428-5435Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00236f
Keywords
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Funding
- 973 Program (China) [2011CB935900]
- National Science Foundation of China (NSFC) [21231005]
- Ministry of Education (MOE) of China [IRT13R30]
- 111 Project [B12015]
- Research Fund for the Doctoral Program of Higher Education of China [20120031110001]
- Tianjin Science & Technology Project [10SYSYJC27600]
- China Scholarship Council (CSC)
- Australian Research Council [DE120101496]
- Australian Research Council (ARC) through a Linkage, Infrastructure, Equipment and Facilities (LIEF) grant [LE0882813]
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Nitrogen-doped carbon coated Co3O4 nanoparticles (Co3O4@NC) with high Na-ion storage capacity and unprecedented long-life cycling stability are reported in this paper. The Co3O4@NC was derived from a metal-organic framework ZIF-67, where the Co ions and organic linkers were, respectively, converted to Co3O4 nanoparticle cores and nitrogen-doped carbon shells through a controlled two-step annealing process. The Co3O4@NC shows a porous nature with a surface area of 101 m(2) g(-1). When applied as an anode for sodium ion batteries (SIBs), Co3O4@NC delivers a high reversible capacity of 506, 317, and 263 mA h g(-1) at 100, 400, and 1000 mA g(-1), respectively. A capacity degradation of 0.03% per cycle over 1100 cycles was achieved at a high current density of 1000 mA g(-1). The outstanding Na-ion storage performance can be ascribed to the nitrogen-doped carbon coating (NC), which facilitates the capacitive reaction, minimizes the volume changes of Co3O4, and also enhances the electronic conductivity. This work sheds light on how to develop high-performance metal oxide@NC nanocomposites for SIBs.
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