期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 203, 期 -, 页码 86-90出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2014.10.026
关键词
Lithium-ion battery; Cr2O3 anode; Metal-organic framework template; Yolk/shell structure
类别
资金
- National Natural Science Foundation of China [51272229, 51272231, 51472217]
- Zhejiang Provincial Natural Science Foundation of China [LR13E020001]
- Qianjiang Talent Project [QJD1302009]
- Welch Foundation of United States [AX-1730]
To make use of a metal organic framework MIL-101(Cr3+) as template and core generator, we report synthesis of a novel nanoscale yolk/shell octahedron of Cr2O3@TiO2 and its high performance as the anode material for lithium ion battery. Nanoscale MIL-101(Cr3+) was coated with amorphous TiO2 shell and calcinated under Ar and then in air atmospheres to form nanoscale Cr2O3@TiO2. After heat treatment, the amorphous TiO2 coated MIL-101(Cr) was transformed into nanosized Cr2O3 crystals with crystalline TiO2 cover, forming multicore yolk/shell octahedrons, as demonstrated from their SEM and TEM morphologies. The resulting Cr2O3@TiO2 has moderate porosity with the BET surface area of 146 m(2) g(-1), and the diameter of its Cr2O3 cores is 10-40 nm. It has demonstrated a reversible capacity of 510 mA h g(-1) after 500 cycles at 0.5 degrees C charge/discharge rate, which is much better than the bare nano Cr2O3 without TiO2 shell, and is one of the best-performed Cr2O3 anode materials. The improved electrochemical performance of Cr2O3@TiO2 is attributed to its small particle size with moderate porosity for the infiltration of electrolyte and the fast diffusion of Li+ ions, its void space within yolk/shell structure to buffer volumetric variation of Cr2O3 and its TiO2 shell to restrain pulverized inner particles. (C) 2014 Elsevier Inc. All rights reserved.
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