期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 9, 期 3, 页码 878-882出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201301461
关键词
alkali metals; carbon; conducting materials; electrodes; insertion
资金
- National Research Foundation (NRF, Singapore) [NRF-CRP4-2008-03]
- Singapore National Research Foundation under its Campus for Research Excellence and Technological Enterprise (CREATE) program
We report the extraordinary performance of carbon-coated sodium super ion conductor (NASICON)-type LiTi2(PO4)(3) as an ideal host matrix for reversible insertion of both Li and Na ions. The NASICON-type compound was prepared by means of a Pechini-type polymerizable complex method and was subsequently carbon coated. Several characterization techniques such as XRD, thermogravimetric analysis (TGA), field-emission (FE) SEM, TEM, and Raman analysis were used to study the physicochemical properties. Both guest species underwent a two-phase insertion mechanism during the charge/discharge process that was clearly evidenced from galvanostatic and cyclic voltammetric studies. Unlike that of Li (approximate to 1.5moles of Li), Na insertion exhibits better reversibility (approximate to 1.59moles of Na) while experiencing a slightly higher capacity fade (approximate to 8% higher than Li) and polarization (780mV) than Li. However, excellent rate capability profiles were noted for Na insertion relative to its counterpart Li. Overall, the Na insertion properties were found to be superior relative to Li insertion, which makes carbon-coated NASICON-type LiTi2(PO4)(3) hosts attractive for the development of next-generation batteries.
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