溶胶-凝胶法合成超细锂快离子导体Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3粉体及其表征  

Preparation and characterization of lithium fast ion conductor Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3 ultrafine powders by sol-gel method

作　　者：苏明如[1] 王志兴[1] 李新海[1] 郭华军[1] 彭文杰[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2013年第2期469-473,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划(973计划)(2007CB613607)

摘　　要：以Ti(OC4H9)4、Li(CH3COO).2H2O、Al(NO3).9H2O和NH4H2PO4为原料,采用溶胶-凝胶法合成Li1.3Al0.3Ti1.7(PO4)3粉体,并研究热处理温度对粉体结构的影响。通过X射线衍射仪(XRD)、扫描电镜(SEM)和电化学阻抗谱(EIS)对制备粉体的结构与性能进行表征。结果表明:溶胶凝胶法可合成纯相LATP粉体,降低热处理温度,且粉体结晶性良好,粒径小于1μm,室温下电导率为1.32×10-3 S/cm,673 K时电导率达到8.94×10-2 S/cm,473～673 K下活化能为31.55 kJ/mol。Li1.3Al0.3Ti1.7（PO4）3 powders were prepared by sol-gel method using Ti（OC4H9）4, Li（CH3COO）.2H2O, Al（NO3）.9 H20 and NH4H2PO4 as starting materials. The influence of synthesis temperature on the structure of Li1.3Al0.3Ti1.7（PO4）3 powders was studied. The structure and the characterization of the powders were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）and electrochemical impedance spectroscopy （EIS）. The results show that pure Li1.3Al0.3Ti1.7（PO4）3 powders with good crystallinity and particle size below i gm are obtained by sol-gel method, and the heating temperature decreases. The lithium ion conductivity is 1.32 × 10^-3 S/cm at room temperature, while it reaches its maximum 8.94× 10^-2 S/cm at 673 K, and its activation energy is 31.55 kJ/mol at the temperature range 0f 473-673 K

关 键 词：锂快离子导体 LI1 3Al0 3Ti1 7(PO4)3 离子电导率 溶胶-凝胶 

分 类 号：O646[理学—物理化学]