一步合成ZrO_(2)表面包覆F、Al共掺尖晶石锰酸锂及其性能研究  

One-step synthesis of ZrO_(2) surface coated with F and Al co-doped spinel lithium manganate and study on its property

作　　者：周灿凯 朱华丽[2] 刘俊 唐焯林 袁梦明 陈召勇 ZHOU Can-kai;ZHU Hua-li;LIU Jun;TANG Zhuo-lin;YUAN Meng-ming;CHEN Zhao-yong(College of Materials Science and Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Physics&Electronic Science,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学材料科学与工程学院,湖南长沙410114 [2]长沙理工大学物理与电子科学学院,湖南长沙410114

出　　处：《现代化工》2021年第7期138-143,共6页Modern Chemical Industry

基　　金：长沙市科技重大专项(kh2003021);国家自然科学基金面上项目(51874048);湖南省教育厅重点科学研究项目(19A003)。

摘　　要：采用喷雾干燥法制备了形貌规整、粒径分布均匀的球型前驱体,再通过煅烧制备了包覆改性复合掺杂尖晶石锰酸锂材料,利用X射线衍射(XRD)、激光粒度、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、CV测试、EIS分析、充放电测试对其结构和电化学性能进行表征,并探究了不同二氧化锆包覆质量分数对氟铝共掺杂材料性能的影响。结果表明,当二氧化锆包覆质量分数为3%时,0.1 C倍率首次放电比容量为118.5 m A·h/g,1 C倍率循环260次后放电比容量为98.2 m A·h/g,容量保持率为83.2%,相比未包覆样品的循环性能有较大提升。Spherical precursor with regular morphology and uniform particle size distribution is prepared by spray drying method,and then the coated and modified composite doped spinel lithium manganate material is prepared by calcination.X-ray diffraction(XRD),laser particle size,scanning electron microscope(SEM),transmission electron microscope(TEM),CV test,EIS analysis,and charge and discharge test are employed to characterize the structure and electrochemical performance of the material.The influences of the mass fraction of zirconium dioxide coatings on the properties of F/Al co-doped material are explored.It is indicated that as the mass fraction of zirconium dioxide coating is3 wt%,the first discharge specific capacity of the material is 118.5 m Ah·g^(-1)at 0.1 C rate,the discharge specific capacity is 98.2 m Ah·g-1 after 260 cycles at 1 C rate,and the capacity retention rate is 83.2%,representing a great improvement compared with the uncoated sample.

关 键 词：锂离子电池 尖晶石锰酸锂 正极材料 喷雾干燥法 表面包覆 

分 类 号：TH3[机械工程—机械制造及自动化]