尖晶石型LiMn_2O_4的制备及结构研究  

Preparation and structure study for spinel LiMn_2O_4

作　　者：杨景海[1] 宫杰[1] 王春忠[2] 王雅新[1] 宗占国[1] 

机构地区：[1]吉林师范大学凝聚态物理研究所,吉林四平136000 [2]吉林大学材料科学与工程学院,吉林长春130023

出　　处：《东北师大学报（自然科学版）》2003年第1期50-53,共4页Journal of Northeast Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(19774028)

摘　　要：　将LiNO3和以沉淀法制备的Mn3O4按一定比例混合制成样品,在空气气氛中分别以不同温度(300℃,400℃,500℃和700℃)进行烧结合成.利用差热-热重分析、X射线衍射、电子能谱及Raman光谱等测试手段对材料的结构及其随烧结温度变化情况进行了研究.首次观察到尖晶石型LiMn2O4的Ra man特征峰.研究表明,低温烧结得到的样品为富氧的尖晶石型LiMn2O4;随着烧结温度的升高,结构中多余的氧逐渐放出,晶胞参数增大,晶体的结合能和晶格振动能增强.The samples were prepared by sinter at different temperature (300℃,400℃,500℃,700℃)in air with the mixtures of LiNO3 and Mn3O4 prepared by deposition method according to proportion. The structures of samples and their changes with sintering temperature were investigated by DTA, TGA, XRD, electron energy spectra and Raman spectra, etc. Raman spectra characteristic peaks of spinel LiMn2O4were observed for the first. The results indicated that low-temperature sintering led to oxygen-rich spinel LiMn2O4 and excessive oxygen was released with increase of sintering temperature, accompanied by increase of lattice parameters and binding energy and vibrational energy.

关 键 词：制备 尖晶石型结构 LIMN2O4 XRD RAMAN 锂离子二次电池 正极材料 湿化学方法 

分 类 号：TM912.2[电气工程—电力电子与电力传动] O614.111[理学—无机化学]