LiNi_(0.05)Mn_(1.95)O_4的合成及对Li^+的离子交换动力学  

Synthesis of LiNi_(0.05)Mn_(1.95)O_4 and Its Ion-exchange Kinetics for Li^+

作　　者：董殿权[1] 刘维娜[1] 刘亦凡[1] 

机构地区：[1]青岛科技大学化工学院,青岛266042

出　　处：《无机化学学报》2009年第7期1238-1242,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.29376245);山东省中青年科学家科研奖励基金(博士基金,No.2008BS09004);青岛科技大学科研启动基金(No.0022322)资助项目

摘　　要：用溶胶-凝胶法合成出尖晶石结构的LiNi0.05Mn1.95O4,用0.5mol·L-1过硫酸铵对其进行改型,制得锂离子筛LiNiMn-H。LiNiMn-H对Li+的饱和交换容量达5.2mmol·g-1。用缩核模型(Shrinking-Core Model)处理该离子交换的反应动力学数据得到LiNiMn-H吸附Li+时离子交换反应的控制步骤是颗粒扩散控制(PDC),同时得到了该实验条件下锂离子筛LiNiMn-H吸附Li+的动力学方程和颗粒扩散系数De。The spinel LiNi0.05Mn0.95O4 was prepared by sol-gel method and the lithium ion-sieve LiNiMn-H was obtained by acid-modifying the available LiNi0.05Mn0.95O4 by 0.5mol ·L^-1 （NH4）2S2O8. The results showed that the saturation capacity of LiNiMn-H for Li^＋ was 5.2 mmol·g^-1 ion-sieve. The kinetics controlled step of LiNiMn-H with Li ^＋ was determined to be particle diffusion control （PDC） by using the shrinking-core model dealing with the dynamics dates of the ion exchange reaction. The different kinetics equations and diffusion coefficients Do of LiNiMn-H for Li^＋ were obtained at the experimental conditions.

关 键 词：LiNi0.05Mn1.95O4 锂 离子筛 动力学 缩核模型 

分 类 号：O611.4[理学—无机化学] O614.111[理学—化学]