期刊
CHEMPLUSCHEM
卷 78, 期 12, 页码 1530-1535出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.201300235
关键词
anodes; electrochemistry; lithium; nanoparticles; X-ray diffraction
资金
- National Basic Research Program of China [2013CB934003]
- National Nature Science Foundation of China [21273019]
- Fundamental Research Funds for the Central Universities [FRF-MP-12-006B]
Li2CoTi3O8 powder has been synthesized by a simple citric nitrate method and was evaluated as an anode material for lithium-ion batteries. The X-ray diffraction (XRD) Rietveld refinement and X-ray photoelectron spectroscopy (XPS) measurements indicate the existence of Ti-site deficiency and a mixed-valence state of Co ions in the Li2CoTi3O8 structure. The refined site-occupation result gave a nonstoichiometric chemical formula of Li2CoTi2.682O8, which corresponds to a theoretical specific capacity of 322mAhg(-1), which is much higher than that of the stoichiometric material (233mAhg(-1)). The synthesized Li2CoTi2.682O8 material exhibits high reversible capacity (ca. 320mAhg(-1)), and excellent cycling stability and rate capability. A specific capacity of about 240 and 160mAhg(-1) can be achieved at 2 and 6Ag(-1), respectively, by the Li2CoTi2.682O8 material. First-principles calculation demonstrates that Ti-site deficiency decreases the bandgap and thus facilitates the electron conduction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据