Li_(1.07)(Ni_(0.4)Mn_(0.53))_(1-x)Al_xO_2正极材料的合成与性能  

Synthesis and properties of Li_(1.07)(Ni_(0.4)Mn_(0.53))_(1-x)Al_xO_2 as cathode materials for lithium ion batteries

作　　者：刘熙林 钟盛文[1] 梅文捷 陈鹏[1] 金柱[1] 王春香[1] 

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州341000

出　　处：《有色金属科学与工程》2015年第5期63-68,共6页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(51372104);江西省科技计划项目(20141BBE50019)

摘　　要：采用共沉淀法结合高温固相法制备Li1.07（Ni0.4Mn0.53）1-xAlx O2正极材料,利用SEM,XRD对所得试样的形貌和晶体结构进行表征,并研究材料的电化学性能.结果表明,少量Al的掺入减小材料的颗粒尺寸,降低材料的放电比容量,但可以提高材料的循环稳定性和倍率性能.其中x=0.01时所得试样在25℃,2.75--4.2 V,0.5 C倍率下的首次放电比容量为125.1 m Ah/g,100次循环后的容量保持率达到99.5%.此外,掺入适量Al后可以降低Li＋在材料中的电荷传递阻抗,改善材料的低温放电性能.Li1.07（Ni0.4Mn0.53）1-xAlxO2 cathode materials were synthesized by co-precipitation method and high temperature solid-state method. The morphologies and crystal structure of Li1.07（Ni0.4Mn0.53）1-xAlxO2 were characterized by SEM and XRD, respectively. The electrochemical properties were also investigated. The results show that the particle size and the discharge specific capacity are reduced by doping appropriate amount of A1 with the improvement of the cycling stability and rate capability for the Al-doped cathode materials. When cycled at 25 ℃ with 0.5 C in the voltage range of 2.75-4.2 V, the sample with x=0.01 delivers an initial discharge specific capacity of 125.1 mAh/g with capacity retention rate of 99.5 % after 100 cycles. Besides, the charge transfer resistance is observed in a decreased tendency accompanied with low-temperature discharge performance applied with appropriate doped Al amount.

关 键 词：锂离子电池 正极材料 Li1.07(Ni0.4Mn0.53)1-xAlxO2 AL掺杂 低温放电性能 

分 类 号：TF114.1[冶金工程—冶金物理化学] TM911.14[电气工程—电力电子与电力传动]