溶胶-凝胶法合成纳米Li_4Ti_5O_(12)负极材料及其电化学性能研究  

Synthesis of nano-sized Li_4Ti_5O_(12) via a sol-gel method and its electrochemical performance study

作　　者：李雅楠[1] 颉莹莹[1] 王瑾[2] 杨晖[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009 [2]纳米技术及应用国家工程研究中心,上海200241

出　　处：《功能材料》2011年第12期2249-2252,2256,共5页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB2097050);国家自然科学基金资助项目(20803035)

摘　　要：以醋酸锂、钛酸四丁酯为原材料,聚乙二醇6000为分散剂,通过溶胶-凝胶法合成Li4Ti5O12前驱体,考察了烧结温度与保温时间对材料电化学性能的影响。实验结果表明烧结制度对Li4Ti5O12的结晶度、微观形貌及电化学性能有显著的影响,以聚乙二醇为表面活性剂,前驱体在700℃的较低温度下保温10h即可得到纯净尖晶石型Li4Ti5O12相,产物颗粒细小均匀,结晶度好,尺寸在100～380nm之间,并显示出良好的电化学性能和倍率性能:在0.1以及5C下首次放电比容量达到164和127mAh/g,经50次循环后仍保持在162和120mAh/g,表现出了优异的循环性能。With lithium acetate and tetrabutyl titanate [Ti（OC4H9）4] as starting materials,and PEG as a surfactant,anode material Li4Ti5O12 for lithium-ion batteries has been prepared by a sol-gel method.The effects of the calcining temperature and calcining time on the electrochemical performance of obtained Li4Ti5O12 were investigated.The results showed that using PEG6000 as surfactant,a single phase material with good crystallinity was obtained by calcining the gel precursors at 700℃ in air for 10h which exhibited the a narrow size distribution（100-380nm）.The nano-sized Li4Ti5O12 power shows excellent rate capability.Its 1st discharge capacities at 0.1 and 5C were 164 and 127mAh/g,respectively,and could be retained at 162 and 120mAh/g after 50 cycles.

关 键 词：LI4TI5O12 溶胶-凝胶 纳米材料 表面活性剂 

分 类 号：TQ912[化学工程]