王征荣,张海朗.过锂量对富锂锰基正极材料Li1.2xNi0.1Co0.2Mn0.5O2结构与电化学性能的影响[J].稀有金属材料与工程,2019,47(3):941~946.[Wang Zhengrong,Zhang Hailang.Effect of Extra Lithium Amount on the Structure and Electrochemical Properties of Li-rich Manganese-based Cathode Material of Li1.2xNi0.1Co0.2Mn0.5O2[J].Rare Metal Materials and Engineering,2019,47(3):941~946.]
过锂量对富锂锰基正极材料Li1.2xNi0.1Co0.2Mn0.5O2结构与电化学性能的影响
投稿时间:2017-07-23  修订日期:2017-09-16
中文关键词:  过锂量  锂离子电池  Li1.2xNi0.1Co0.2Mn0.5O2  电化学性能
基金项目:
中文摘要:
      采用流变相法合成得到Li1.2+xNi0.1Co0.2Mn0.5O2(x=0, 0.036, 0.060, 0.096),探讨过锂量对结构和电化学性能的影响。X射线衍射(XRD)对样品进行结构分析,所有样品具有典型的α-NaFeO2结构和较小的阳离子混排度。扫描电镜(SEM)对样品进行表征,不同过锂量的材料,颗粒相对均匀,表面光滑。电化学性能测试结果表明:最佳过锂量为x=0.036时,正极材料Li1.236Ni0.1Co0.2Mn0.5O2在0.05C、2~4.8V测试条件下进行电化学性能测试,25℃和55℃下该材料初始放电容量分别为215.3mAh?g-1和297.1mAh?g-1,首次库伦效率分别为69.7%和84.6%,0.2C下循环50次后容量保持率分别为89.0%和87.8%,且x=0.036时该材料具有最佳的倍率性能。
Effect of Extra Lithium Amount on the Structure and Electrochemical Properties of Li-rich Manganese-based Cathode Material of Li1.2xNi0.1Co0.2Mn0.5O2
英文关键词:extra lithium amount  lithium ion battery  Li1.2xNi0.1Co0.2Mn0.5O2  electrochemical properties
英文摘要:
      The Li-rich manganese-based cathode of Li1.2+xNi0.1Co0.2Mn0.5O2(x=0, 0.036, 0.060, 0.096) was synthesized by a rheological phase method. The effect of extra lithium amount on the structure and electrochemical properties was discussed. X-ray diffraction (XRD) indicates that all samples had typical α-NaFeO2 structure and small cationic mixing degree. Scanning electron microscope (SEM) showed that the materials with different amount of extra lithium were relatively uniform, smootn surface. The result of electrochemical tests showed that the material with optimal amount of extra lithium (x=0.036) achieved the best electrochemical performance. The tesing of electrical performance between 2~ 4.8V at 0.05C showed that the initial discharge capacity was up to 215.3mAh?g-1 at 25℃ with the initial efficiency of 69.7% and 297.1mAh?g-1 at 55℃ with the initial efficiency of 84.6 %。After 50 cycles at 0.2C, the capacity retention was 89.0% at 25℃ and 87.8% at 55℃. And when x=0.036, the material had the best rate performance.
作者单位E-mail
王征荣 江南大学 化学与材料工程学院 wangzhengrongjs@163.com 
张海朗 江南大学 化学与材料工程学院 zhl8868@vip.163.com 
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