Li_(0.5)La_(0.5)TiO_3包覆LiNi_(l/3)Co_(1/3)Mn_(l/3)O_2材料的研究  

Study on LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 materials coated by Li_(0.5)La_(0.5)TiO_3

作　　者：刘永光[1] 田卿卿[1] 朱靖[1] 

机构地区：[1]河北联合大学化工学院,唐山063009

出　　处：《化工新型材料》2013年第2期109-111,共3页New Chemical Materials

基　　金：河北省教育厅计划项目(2010288);唐山市科学技术研究与发展计划项目(111102013b)

摘　　要：以Li0.5La0.5TiO3为包覆物,制备了固体电解质包覆的LiNil/3Co1/3Mnl/3O2正极材料。采用XRD、SEM对材料进行了表征:XRD显示未包覆的材料具有α-NaFeO2层状结构,粒径在200～300nm之间,包覆后材料粒径略有增大,包覆层具有ABO3型固体电解质结构。包覆层的致密程度及材料的循环稳定性与热处理温度有关。包覆后400℃热处理得到的材料首次放电比容量为185mAh/g,较未包覆材料容量有所提高,50次循环后其容量仍能达到156.5mAh/g,表明包覆物Li0.5La0.5TiO3对LiNil/3Co1/3Mnl/3O2具有保护作用。LiNi1/3Co1/3Mn1/3O2 anode materials coated by Li0. 5 La0.5 TiO3 were prepared by the hydrothermal meth-od. The materials were characterized by XRD and SEM, which showed that the uncoated particles had α-NaFeO2 structure and diameter range from 200-300nm. The coating layer had typical ABO3 structure and formed as crystalline depending on the heating temperature. In particular, the cycle stability was significantly associated with heating temperature. It appeared that after sintered at 400℃ ,the capacity of the material was 185mAh/g in the first discharge, and remained 156. 5mAh/g after 50 cycles. These indicated that the Lio. 5 Lao. 5 TiO3 coating was effective in suppressing the chemical and structural in-stabilities of LiNi1/3Co1/3Mn1/3O2.

关 键 词：锂离子电池 固体电解质 表面包覆 LiNi1/3Co1/3Mnl/3O2正极材料 

分 类 号：TM912[电气工程—电力电子与电力传动]