钴镍掺杂锰酸锂的电化学性能研究  

Electrochemical characterization of LiMn_2O_4

作　　者：高农[1] 张若楠[2] 张旭[1] 顾大明[2] 

机构地区：[1]黑龙江工程学院电子工程系,黑龙江哈尔滨150050 [2]哈尔滨工业大学应用化学系,黑龙江哈尔滨150001

出　　处：《材料科学与工艺》2008年第2期232-234,238,共4页Materials Science and Technology

基　　金：黑龙江省自然科学基金资助项目(E2004-24);黑龙江省教育厅科技研究资助项目(11531300)

摘　　要：采用固相烧结法分别制备了钴掺杂和镍掺杂锰酸锂锂离子电池正极材料，同时制备了纯相锰酸锂进行比较。用电感耦合等离子发射光谱仪、X射线衍射仪、电子扫描电镜和电池性能测试系统对产物的组成、结构特征、微观表面形貌和恒流充放电性能进行了表征。结果表明：所制备的掺杂锰酸锂LiMn0.9Ni0.1O2、LiMn0.9Co0.1O2的结晶度高，无杂质相，材料颗粒的粒径均匀、表面光滑；首次放电比容量分别为114.7mAh／g和110.8mAh／g（0.5mA／cm，2.8-4.4V，vs. Li^＋/Li）；50次循环后，放电比容量为107.2mAh／g和103.3mAh／g，50次循环比容量保持率分别达到94.1％和95.4％。Solid state sinter method was used to synthesize the Co-doped and Ni-doped LiMn2O4 cathode mate-rials of Li-ion batteries respectively, and the pure LiMn2O4was prepared to compare with them. The composition, microstructure, morphology and cycle properties of the products were characterized by inductive coupled plasma atomic emission spectrometry （ ICP - AES）, X-ray diffraction （ XRD）, scanning electronic microscopy （SEM） and galvanostatic cycle respectively. The results showed that the prepared material was the structure of spinel phase lithium manganate with high crystallinity and without impurity phase; the size of the particles was well distributed; the first discharge specific capacities of the LiMn1.9 Ni0.1O4 and LiMn1.9Co0.1O4 were 114.7 mAh/g and 110.8 mAh/g（0.5 mA/cm,2.8 - 4.4 V,vs. Li^＋/Li）;the discharge specific capacities could still retain 107.2 mAh/g and 103.3 mAh/g after 50 cycles, the specific capacity retention were 94.1% and 95.4% respectively.

关 键 词：钴掺杂 镍掺杂 锰酸锂 正极材料 电化学性能 

分 类 号：TQ131.11[化学工程—无机化工] TM912.9[电气工程—电力电子与电力传动]