Combustion synthesis of high-performance Li4Ti5O12 for secondary Li-ion battery
Combustion synthesis of high-performance Li4Ti5O12 for secondary Li-ion battery
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DOI：
10.1016/j.ceramint.2008.10.010
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发表时间：
2009-07
影响因子：
5.2
通讯作者：
Tao Yuan;R. Cai;Ke Wang;R. Ran;Shaomin Liu;Zongping Shao
中科院分区：
文献类型：
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作者：
Tao Yuan;R. Cai;Ke Wang;R. Ran;Shaomin Liu;Zongping Shao
采用简单的甘氨酸-硝酸盐自燃烧法制备了尖晶石Li4Ti5O12。用X射线衍射仪、扫描电子显微镜、比表面积和透射电子显微镜对自燃烧和不同温度下焙烧的产物进行了表征。在700℃或更高的焙烧温度下，可以得到纯净的、结晶良好的纳米Li4Ti5O12氧化物。700C焙烧的Li4Ti5O12的电化学性能最好，在10C放电倍率下的容量为125mAh/g，在40℃下仍具有较稳定的循环性能。电化学阻抗谱测试表明，Li4Ti5O12的表面反应动力学随其电子电导率的增加而显著改善。
Spinel Li4Ti5O12was synthesized by a simple glycine-nitrate auto-combustion by applying aqueous medium and constricting the reactions in the pores of cellulose fibers. The products from the auto-combustion and further calcination at various temperatures were characterized by XRD, SEM, BET surface area and TEM examinations. Pure phase and well-crystallized nano-Li4Ti5O12oxides were obtained at a calcination temperature of 700°C or higher. The 700°C calcined one shows the best and high electrochemical performance, which reached a capacity of ∼125mAh/g at 10C discharge rate with fairly stable cycling performance even at 40°C. Electrochemical impedance spectroscopy tests demonstrated that the surface reaction kinetics of Li4Ti5O12was improved significantly with the increase of its electronic conductivity.