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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 perform-ance 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.
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 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 perform-ance 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 .