کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1294521 | 973620 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pillared layered Li1â2xCaxCoO2 cathode materials obtained by cationic exchange under hydrothermal conditions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A simple method has been employed to prepare pillared layered Li1â2xCaxCoO2 cathode materials by cationic exchange under hydrothermal conditions. The synthesized materials were characterized by means of X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), field emission scanning electron microscope (FE-SEM) and galvanostatic charge-discharge cycling. The XRD data of the products show that they are single phases and retain the layered α-NaFeO2 type structure. The FE-SEM images of the materials prepared by hydrothermal method show uniform small particles, and the particle size of the materials is about 200 nm. The initial discharge specific capacities of layered LiCoO2 and pillared layered Li0.946Ca0.027CoO2 cathode materials calcined at 800 °C for 5 h within the potential range of 3.0-4.3 V (vs. Li+/Li) are 144.6 and 142.3 mAh gâ1, respectively, and both materials retain good charge-discharge cycling performance. However, with increasing upper cutoff voltage, the pillar effect of Ca2+ in Li1â2xCaxCoO2 becomes more significant. The pillared layered Li0.946Ca0.027CoO2 has a higher capacity with an initial discharge specific capacity of 177.9 and 215.8 mAh gâ1 within the potential range of 3.0-4.5 and 4.7 V (vs. Li+/Li), respectively, and retains good charge-discharge cycling performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 184, Issue 2, 1 October 2008, Pages 557-561
Journal: Journal of Power Sources - Volume 184, Issue 2, 1 October 2008, Pages 557-561
نویسندگان
Zhanxu Yang, Wensheng Yang, Zhanfeng Tang,