کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10668829 | 1008474 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
TiO2 coating for long-cycling LiCoO2: A comparison of coating procedures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The cycling properties of LiCoO2 coated with TiO2 by a sol-gel process from an alkoxide precursor and a mechano-thermal process from pre-formed nanoparticles are compared. Electron microscopic images of 1.0 wt.% TiO2-coated particles revealed that the oxide formed a compact coating over the cathode particles. XRD studies showed a general decrease in the value of the lattice parameter c upon coating, indicating that substitutional compounds might have formed on the surface during calcination. R-factor values from XRD studies and galvanostatic charge-discharge studies suggested that a coating level of 1.0 wt.% was optimal for materials with good cycling characteristics. While the sol-gel coating process enhanced cyclability 5-fold, the mechano-thermal process yielded materials that exhibited a 12-fold improvement. The enhanced cyclability is attributed to a suppression of the cycle-limiting hexagonal/monoclinic/hexagonal phase transitions accompanying the charge-discharge processes. Materials with better electrochemical characteristics could be obtained by the mechano-thermally coating process than sol-gel. Furthermore, the mechano-thermal coating process is a simple, inexpensive, environmentally benign and commercially viable one for the production of high-cycling LiCoO2 cathode materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 199, Issue 1, 1 September 2005, Pages 22-31
Journal: Surface and Coatings Technology - Volume 199, Issue 1, 1 September 2005, Pages 22-31
نویسندگان
George Ting-Kuo Fey, Cheng-Zhang Lu, T. Prem Kumar, Yu-Chen Chang,