This paper describes a modified colloidal crystal templating method to prepare three-dimensionally ordered macroporous (3DOM) β-Bi2O3. The 3DOM β-Bi2O3 materials exhibit higher specific capacities and better capacity retention than conventional β-Bi2O3 nanoparticles as anode materials for Li-ion batteries. The initial discharge capacity of 3DOM β-Bi2O3 was as high as 1296 mA h g−1 and the fourth discharge capacity was 526 mA h g−1, whereas the discharge capacity of conventional non-templated β-Bi2O3 was only 299 mA h g−1 after 4 cycles at a current rate of 0.2C. The improved electrochemical behavior of the 3DOM β-Bi2O3 electrodes is attributed to the 3DOM architecture, which provides easy access for Li+ ions to the surface of active material nanoparticles and short diffusion paths within the macropore walls, and also to the unique tunnel structure of β-Bi2O3.
Bibliographical noteFunding Information:
This project is sponsored by Shanghai University of Engineering Science Innovation Fund for Graduate Students ( 16KY0404 ) and supported by Shanghai Municipal Education Commission (High-energy Beam Intelligent Processing and Green Manufacturing) and the University of Minnesota Initiative for Renewable Energy and the Environment (IREE). Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from the NSF through the MRSEC program.
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- 3DOM &beta
- Colloidal crystal templating
- Li-ion battery