کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1602514 | 1515910 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation and characterization of LiAlxMn2-xO4 for a supercapacitor in aqueous electrolyte
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
LiAlxMn2-xO4 (0â¤xâ¤0.5) was synthesized by high temperature solid-state reaction. The structure and morphology of LiAlxMn2-xO4 were investigated by X-ray diffraction and scanning electron microscopy (SEM). The results indicate that all samples show spinel phase. The polyhedral particles turn to club-shaped, then change to small spherical, and finally become agglomerates with increasing Al content. The supercapacitive performances of LiAlxMn2-xO4 were studied by means of galvanostatic charge-discharge, cyclic voltammetry, and alternating current (AC) impedance in 2 mol·Lâ1 (NH4)2SO4 aqueous solution. The results show that LiAlxMn2-xO4 represents rectangular shape performance in the potential range of 0-1 V. The capacity and cycle performance can be improved by doping Al. The composition of x=0.1 has the maximum special capacitance of 160 F·gâ1, which is 1.37 times that of LiMn2O4 electrode. The capacitance loss of LiAlxMn2-xO4 with x=0.1 is only about 14% after 100 cycles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Minerals, Metallurgy and Materials - Volume 16, Issue 1, February 2009, Pages 112-118
Journal: International Journal of Minerals, Metallurgy and Materials - Volume 16, Issue 1, February 2009, Pages 112-118
نویسندگان
Yun Xue, Ye Chen, Mi-lin Zhang, Yong-de Yan,