Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 26, Pages 9475-9479Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm10924c
Keywords
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Funding
- Zhejiang University
- Fundamental Research Funds for the Central Universities [2010QNA4003]
- Ph.D Programs Foundation of Ministry of Education of China [20100101120024]
- Foundation of Education Office of Zhejiang Province [Y201016484]
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Double-shelled hollow microspheres of LiMn2O4 were prepared by a facile self-template method. The inner and outer shells of the obtained microspheres are composed of nanoparticles with diameters ranging between 200-400 nm. Galvanostatic charge/discharge cycling shows that this material delivers a discharge capacity of 127 mAh g(-1) at C/10 rate and a capacity retainability of 80% after 800 cycles at 5 C rate, revealing a high reversible capacity, superior rate capability and excellent cycling stability under high rates. The improved performance is attributed to the short Li+ ion diffusion lengths in the nanobuilding blocks and the void core and space between the inner and outer shells to accommodate the volume expansion/contraction during Li+ ions insertion/extraction processes.
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