Cr掺杂高压锂离子电池正极材料LiNi_(0.5)Mn_(1.5-x)Cr_(x)O_(4)的合成与电化学表征  

Synthesis and electrochemical characterization of Cr doped LiNi_(0.5)Mn_(1.5-x)Cr_(x)O_(4) for high voltage lithium ion anode material

作　　者：桂林峰 张海朗 GUI Lin-feng;ZHANG Hai-lang(College of Material Engineering,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122

出　　处：《应用化工》2020年第S01期216-220,共5页Applied Chemical Industry

摘　　要：通过流变相法合成了正极材料LiNi_(0.5)Mn_(1.5-x)Cr_(x)O_(4)(0≤x≤0.06).采用X射线衍射仪(XRD)和电子扫描电镜(SEM)以及恒电流充放电测试系统来研究结构和电化学性质.XRD测试结果表明,不同含量的Cr掺杂的LiNi_(0.5)Mn_(1.5-x)Cr_(x)O_(4)(x=0,0.01,0.03,0.06)显示了相同的尖晶石结构,并且Cr掺杂的正极材料表现出良好的循环稳定性能.当x=0.01时LiNi_(0.5)Mn_(1.49)Cr_(0.01)O_(4)具有最高的放电比容量.在0.2C倍率时,初始放电比容量具有137.6 mAh/g,循环50次后容量保持率为98.5%.High voltage LiNi_(0.5)Mn_(1.5-x)Cr_(x)O_(4)(0≤x≤0.06)spinel lithium ion battery cathode materials were synthesized by rheological method.Their structures and electrochemical properties were studied by X-ray diffraction(XRD),electron scanning electron microscopy(SEM),EDS and constant current charge-discharge tests.XRD results showed that LiNi_(0.5)Mn_(1.5-x)Cr_(x)O_(4)(x=0,0.01,0.03,0.06)doped with Cr,which showed the same spinel structure,and Cr doped anode materials showed good cycling stabilty.When x=0.01,LiNi_(0.5)Mn_(1.49)Cr_(0.01)O_(4)has the highest discharge specific capacity.At 0.2C rate,the initial dis-charge specific capacity is 137.6 mAh/g,and the capacity retention rate is 98.5%after 50 cycles.

关 键 词：锂离子电池 流变相法 正极材料 LiNi_(0.5)Mn_(1.49)Cr_(0.01)O_(4) CR掺杂 

分 类 号：TM9[电气工程—电力电子与电力传动]