Preparation and characterization of LiAlxMn2-xO4 for a supercapacitor in aqueous electrolyte |
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| Authors: | Yun Xue Yong-de Yan |
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| Affiliation: | College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China |
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| Abstract: | LiAlxMn2—xO4 (0≤x≤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·L−1 (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·g−1, 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. |
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| Keywords: | supercapacitor electrode materials aqueous electrolyte spinel |
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