期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 43, 页码 23254-23259出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm35607d
关键词
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资金
- National Basic Research Program of China (the 973 Project of China) [2011CB935901]
- Independent Innovation Foundations of Shandong University [2012ZD008]
- National Natural Science Fund of China [91022033]
Transition metal oxides are important functional materials that have gained enormous research interest in recent years. In this work, porous cubic manganese cobalt spinel Mn1.5Co1.5O4 core-shell microspheres were first prepared via a urea-assisted solvothermal route followed by pyrolysis of the carbonate precursor. The microsphere is composed of the shell of 400 nm thickness and the core with a 2.5 mu m diameter. Nitrogen sorption isotherms show that this structure possesses a high surface area of 27.0 m(2) g(-1) with an average pore diameter of 30 nm. Compared with a simple spherical nanopowder, such a core-shell like porous structure is expected to improve the electrochemical performance, due to its higher resistance against separation or isolation during the electrochemical reaction. The as-prepared Mn1.5Co1.5O4 core-shell microspheres show an excellent cyclic performance at high current density with more than 90% capacity retention in a testing range of 300 cycles when used as an anode material for lithium ion batteries (LIBs), which can be attributed to the appropriate pore size and unique core-shell structures. Therefore, the Mn1.5Co1.5O4 core-shell microspheres prepared by the present synthetic route could be identified as a potential anode candidate for the near future development of LIBs.
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