LiTi_2(PO_4)_3的Na/Li离子交换特征

Ion Exchange Behavior of Na/Li for the Lithium Ion Conductor of LiTi_2(PO_4)_3

锂离子传导材料LiTi2(PO4)3能在LiCl水溶液中高选择性地与Na+进行离子交换.研究了NaCl溶液中LiTi2(PO4)3上的Na/Li离子交换反应,实验结果表明,升高温度能显著提高LiTi2(PO4)3上的Na/Li离子交换反应速率,其离子交换动力学规律可近似由JMAK(Johnson-Mehl-Aurami-Kalmogorav)方程描述.对LiTi2(PO4)3在水和NaCl溶液中的溶解行为的研究结果表明,升高温度能加快其在水中的溶解速率,pH值过大或过小及离子交换都会加剧LiTi2(PO4)3的溶解.

The lithium ion conductor LiTi2（PO4）3 has a very high ion exchange selectivity to Na^＋ in lithium chloride solution. The ion exchange behavior of Na/Li for LiTi2（PO4）3 in NaC1 solution was investigated. The experimental results showed that the Na/Li ion exchange reaction rate increased obviously for LiTi（PO4）3 with increasing temperature, and the Na/Li ion exchange kinetics process of LiTi2（PO4）3 in sodium chloride solution could be represented approximately by the equation of JMAK（Johnson-Mehl-Aurami-Kalmogorav）. The dissolution behaviors of LiTi2（PO4）3 in water and NaC1 solution were investigated, the results showed that higher temperature, acid or alkali environment could enhance the dissolution of LiTi（PO4）3.