锂离子电池正极材料LiMn_2O_4的改性研究  

Modification of LiMn_2O_4 for Cathode Materials of Lithium Ion Batteries

作　　者：蔡振平[1] 卢世刚[1] 李明勋[1] 金维华[1] 

机构地区：[1]北京有色金属研究总院矿物资源与冶金材料所,北京100088

出　　处：《稀有金属》2005年第5期704-707,共4页Chinese Journal of Rare Metals

基　　金：国家自然科学基金(50074012)资助项目

摘　　要：为改善尖晶石LiMn2O4的循环性能,采用高温固相法合成了由Li2CO3改性的尖晶石锂锰氧化物,研究了Li2CO3添加量对LiMn2O4性能的影响。通过XRD,Rietveld精细XRD分析和模拟电池等方法对产物的结构和电化学性能进行了表征与测试。结果表明,部分Li进入到尖晶石LiMn2O4的晶格中,增强了材料充放电循环过程中的结构稳定性。随着Li2CO3量的增加,产物的循环稳定性增加。当Li2CO3的加入量为0.06摩尔比时,10次循环后的高温容量衰减由改性前的15%降低到6.8%。In order to improve the cyclic performance of spinel LiMn2O4, the lithium mangnese oxides modified with Li2CO3 were prepared by solid phase reaction at high temperature. The effect of Li2CO3 content on electrochemical characteristics of LiMn2O4 was studled. Structure and electrochemical performance of the material were characterized by means of XRD, Rietveld refine XRD and model battery. The results show that partial Li^＋ entrancing into the spinel crystalstructure may imporve the stability of crystalline structure. Products with high Li2CO3 ratio exhibited best cyclic performance at room temperature and elevated temperature. The best electrochemical performance is shown by a composite containing 0.06 molar ratio of Li2CO3, in this time the capacity loss decreases from 15% for pure LiMn204 to 6.8% at 55℃ after 10 cycles.

关 键 词：锂离子电池 LIMN2O4 改性 电化学性能 

分 类 号：TM201.4[一般工业技术—材料科学与工程]