【作者】 周晓玲； 黄瑞安； 吴肇聪； 杨斌； 戴永年；

【Author】 ZHOU Xiao-Ling,HUANG Rui-An,WU Zhao-Cong,Yang Bin,DAI Yong-Nian (National Engineering Laboratory for Vacuum Metallurgy,Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,Kunming 650093,China)

【机构】 昆明理工大学冶金与能源工程学院真空冶金国家工程实验室；

【摘要】 采用溶胶-凝胶法,以乙酰丙酮（ACAC）为稳定剂、聚乙二醇（PEG）为分散剂,合成了尖晶石型钛酸锂。通过X射线衍射（XRD）,扫描电子显微镜（SEM）和恒电流充放电测试对材料的结构,形貌和电化学性能进行了表征和分析。结果表明,在700℃烧结3h的条件下合成了结晶良好的亚微米纯相尖晶石型钛酸锂,并具有良好的循环性能和倍率性能。该材料的首次放电比容量为169mAh g^-1,以0.2,0.5,1,2C倍率放电进行测试,50次循环后克容量分别为164,141,132,110mAh g^-1,并利用循环伏安曲线（CV）分析了该材料的电化学机理。更多还原

【Abstract】 Spinel Li₄Ti₅O₁₂ was successfully prepared by sol-gel processing using acetylacetone as chelating ligand, and polyethylene glycol as template.The morphology,phase structure and electrochemical performance of Li₄Ti₅O₁₂ were characterized by X-ray diffraction（XRD）,scanning electron microscope（SEM） and charge-discharge tests.It was found that sub-micron pure spinel Li₄Ti₅O₁₂ was obtained upon calcination at temperature of 700℃over three hours,which exhibits very good cycling life with an initial specific discharge capacity of 169mAh g^-1.When tested at a rate of 0.2,0.5,1 and 2C,it still retained a discharge capacity of 164,141, 132,110mAh g^-1,respectively,after 50 cycles,indicating that this anode material also has an excellence highrate performance.The Electrochemical mechanism of li-ion insertion/extraction was also investigated by Cyclic voltammetry（CV）.更多还原