期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 24, 页码 9272-9279出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta01474j
关键词
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资金
- National Natural Science Foundation of China
- Natural Science Foundation of Guangdong Province [U1134002]
- National Natural Science Foundation [21273084]
- Natural Science Fund of Guangdong Province [10351063101000001]
- key project of Science and Technology in Guangdong Province [2012A010702003]
Porous LiMn2O4 was fabricated with cubic MnCO3 as precursor and characterized in terms of structure and performance as the cathode of a lithium ion battery. The characterizations from SEM, TEM and XRD demonstrate that the fabricated product has a cubic morphology with an average edge of 250 nm, which it inherits from the precursor, and a porous structure architectured with single-crystalline spinel nanoparticles of 50 nm, which imitates the Mn2O3 that results from the thermal decomposition of the precursor. The charge-discharge tests show that the synthesized product exhibits excellent rate capability and cyclic stability: delivering a reversible discharge capacity of 108 mA h g(-1) at a 30 C rate and yielding a capacity retention of over 81% at a rate of 10 C after 4000 cycles. The superior performance of the synthesized product is attributed to its special structure: porous secondary cube particles consisting of primary single-crystalline nanoparticles. The nanoparticle reduces the path of Li ion diffusion and increases the reaction sites for lithium insertion/extraction, the pores provide room to buffer the volume changes during charge-discharge and the single crystalline nanoparticle endows the spinel with the best stability.
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