共沉淀法制备LiMnxCoyO2的显微结构及其电化学性能
Microstructure and Electrochemical Properties of Co-precipitation Prepared LiMnxCoyO2
作者单位E-mail
王琛 中南大学材料科学与工程学院, 长沙 410083  
章梦琴 中南大学材料科学与工程学院, 长沙 410083  
肖文豪 中南大学材料科学与工程学院, 长沙 410083  
艾延龄 中南大学材料科学与工程学院, 长沙 410083;中南大学有色金属材料科学与工程教育部重点实验室, 长沙 410083 ylai@csu.edu.cn 
摘要: 通过共沉淀法制备前驱体,随后在900℃下经不同时长烧结得到了层状LiMnxCoyO2。X射线衍射、扫描电镜和透射电镜的研究结果表明,层状LiMnxCoyO2的晶体结构是菱面体点阵,空间群是R3m,点阵常数与LiCoO2非常接近。不同烧结时长下得到的样品在扫描电镜下均呈球状,随着烧结时间延长,球形规整度变得更好。对不同样品的电化学性能测试表明,烧结时间越长,样品中Mn的相对含量越高,其首次充放电比容量和循环性能越好。
关键词: LiMnxCoyO2  晶体结构  循环性能  共沉淀法  烧结
基金项目: 长沙市科技计划(No.K1005011-11)资助项目。
Abstract: Layered LiMnxCoyO2 was prepared by co-precipitation preparation of precursor, and then sintered under 900℃ with different time. The results of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that the crystalline structure of the layered LiMnxCoyO2 is rhombohedron lattice whose space group is R3m, and has a similar lattice constant with LiCoO2. Under different sintering time, samples are spherical under scanning electron microscopy (SEM); as the sintering time extended, spherical morphology is better. With different samples of electrochemical performance test show that the samples with longer sintering time and higher relative content of Mn has better initial charge-discharge capacity and cycle performance.
Keywords: LiMnxCoyO2  crystal structure  cycle performance  co-precipitation  sintering
投稿时间:2017-01-09 修订日期:2017-03-28
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王琛,章梦琴,肖文豪,艾延龄.共沉淀法制备LiMnxCoyO2的显微结构及其电化学性能[J].无机化学学报,2017,33(5):860-866.
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