溶胶-凝胶-微波法制备阴阳离子同时掺杂型LiAl_xMn_(2-x)O_yF_z  

Anion-cation Synchronous Substitution of LiAl_xMn_(2-x)O_yF_z by Sol-gel-microwave Method

作　　者：刘思印[1] 李国防[1] 李贯良[1] 

机构地区：[1]商丘师范学院化学系,河南商丘476000

出　　处：《化学世界》2008年第8期453-456,共4页Chemical World

基　　金：河南省重大科技攻关项目(0624210020)

摘　　要：以LiNO3、Al(NO3)3·9H2O、LiF和MnNO3为原料,通过控制n(Li)/n(Mn)和Al、F掺杂量,溶胶-凝胶-微波法在750℃下合成阴阳离子复合掺杂型Li1.00Al0.05Mn1.95O3.95F0.05电极材料。XRD实验证明Li1.00Al0.05Mn1.95O3.95F0.05为纯尖晶石结构。掺杂适量的Al可以改善材料的循环性能,掺杂氟不但可以不降低材料的初始比容量而且可以显著降低材料在高温使用时的容量损失。Li1.00Al0.05Mn1.95O3.95F0.05在室温条件下的首次放电比容量达到115mAh/g,循环50次后放电比容量仍保持在109mAh/g,即使在55°C的高温,50次的总容量损失率也仅有10.1%。Uing lithium nitrate, aluminium nitrate, lithium fluoride and manganese nitrate as starting materials and controlling the ratio of n（Li） to n（Mn） and the mount of nitrate and fluoride doped, Li1.00 Al0.05Mn1.95O3. 95F0.05 was prepared at 750℃ by a sol-gel-microwave method. XRD data indicated that Lil.00 Al0.05Mn1.95 O3.95 F0.05 spinel was formed. The test of charge-discharge proved that doping aluminium appropriately could enhance the stability of the material and doping fluoride appropriately not only increased the initial discharge capacity of the material but also improved its cycle stability at high temperature. The initial discharge capacity of Li1.00Al0.05 Mn1.95O3.95F0.05 was 115 mAh/g and maintained 109 mAh/g after 50 cycles at room temperature, and the decrease was only 10.1% at 55 ℃.

关 键 词：溶胶-凝胶-微波法 掺杂 尖晶石型LiAlxMn2-xOyFz 电化学性质 

分 类 号：TM912.9[电气工程—电力电子与电力传动]