【摘 要】
：
LiAlxMn2-xO4 (0≤x≤0.5) was synthesized by high temperature solid-state reaction.The structure and morphology of LiAl/Mn2-xO4 were investigated by X-ray diffra
【机 构】
：
College of Materials Science and Chemical Engineering
【基金项目】
：
Ph.D.Program Foundation of the Ministry of Education of China
论文部分内容阅读
LiAlxMn2-xO4 (0≤x≤0.5) was synthesized by high temperature solid-state reaction.The structure and morphology of LiAl/Mn2-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-l (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.
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