Na/Li离子交换反应的影响
( 东北大学 材料与冶金学院， 沈阳 110004)
摘 要: Li1.3Ti1.7Al0.3(PO4)3是具有Nasicon骨架的锂离子传导材料， 其中的Li+很容易被溶液中的Na+置换。 研究了在Li1.3Ti1.7Al0.3(PO4)3结构中掺入Zr来替代Ti， 以提高Na/Li离子交换速度。 结果表明： 增加Zr元素比例可显著提高Li1.3Ti1.7-xZrxAl0.3(PO4)3材料中Na/Li离子交换反应速度。 Li1.3Ti1.7-xZrxAl0.3(PO4)3材料中的Na/Li离子交换反应动力学过程可近似由JMAK方程描述。
关键字: Zr； Li1.3Ti1.7Al0.3(PO4)3；离子交换
Li1.3Ti1.7Al0.3(PO4)3
（ School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract: The lithium ion conductor Li1.3Ti1.7Al0.3(PO4)3 is Nasicon structural functional material, which has very high ion exchange selectivity to Na+. The effect of Zr on Na/Li ion exchange reaction and behavior for the Li1.3Ti1.7Al0.3(PO4)3 in sodium chloride solution was investigated. The experimental results show that the Na/Li ion exchange mass and exchange fraction significantly raise for Li1.3Ti1.7-xZrxAl0.3(PO4)3 with Zr element increasing in the same infiltration time. The Na/Li ion exchange reaction process was investigated by means of X-ray diffraction. It is shown that the reactants is Na1.3Ti1.7-xZrxAl0.3(PO4)3 during all the reactive process. The ion exchange kinetics of Na/Li for Li1.3Ti1.7-xZrxAl0.3(PO4)3 is analyzed and discussed. The Na/Li ion exchange kinetics process of Li1.3Ti1.7-xZrxAl0.3(PO4)3 in sodium chloride solution can be represented approximately by the equation of JMAK.
Key words: Zr; Li1.3Ti1.7Al0.3(PO4)3; ion exchange
