文档介绍：摘 要
尖晶石型锰酸锂具有无毒、能量密度高等特点,是下一代锂离子电池最有前途的正极材料之一。但在充放电循环过程中,由于锰的溶解、电解液分解以及Jahn-Teller效应等原因,尖晶石型锰酸锂的比容量衰减较快,因此如何改善其性能也成为了研究的热点。
本文分别采用了燃烧法和乳液干燥法制备尖晶石型锰酸锂,并探讨了灼烧温度、灼烧时间、原料的不同配比、掺杂离子的量对材科性能的影响。利用x射线仪对所制备材料的结构进行了表征,结果表明两种方法制备的材料均是尖晶石型锰酸锂。利用SEM对材料的形貌进行了分析,表明所制得的样品具有较好的形貌特征,粒径分布很均匀。将所得的材料制成正极,组装成电池,测试了其电循环性能。确定材料的最佳制备条件,制备了性能优异的锰酸锂正极材料。为进一步对锂离子电池正极材料尖晶石型锰酸锂改性奠定了一定的基础。
关键词:锂离子电池 正极材料 锰酸锂 合成与表征
Abstract
The spinel LiMn204 is promising to be cathodes for Li-ion battery,due tO its relatively high energy density and low ,the capacity of spinel LiMn204 fades rapidly in tlle charge-discharge cycle has been suggested that the capacity fading is due to Jahn·Teller distortion,
dissolution of manganese into the electrolyte and position of the
how to improve the function of the spinel LiMn204
having e the hot spot studying.
In this dissertation,two methods are adopted to prepare the spinel manganic acid bustion method,the other is drying four kinds of factors including the sinter temperature,sinter time,different proportion of raw material and the amount of doped ious were discussed foT the function of the pinel LiMn20,.The structure of the
material were charactered by the X—ray apparatus,and both two material
made by different methods are proved to be spinel LiMn20,.The material were found to be granular on the shape appearance by SEM,and the
diameter of the particle were electricity circulation
functioU were measured by making the matedal as the anode of the battery. 皿e bcst preparation condition of the material was outstanding LiMn204 of anode material were made spinel
LiMn204 was a kind of li-ion battery cathode matedal,and this study was a
basis for the modification about the spinel LiMn204.
Key words:lithium ion battery cathode material LiMn204
synthesis and characterization
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长春理工大学硕士学位论文原创性声明
本人郑重声明:所呈交的硕士学位论文,《锂离子电池正极材料LiMn204的合成与表征》是本人在指导教