NiFe2O4@LiMn2O4正极材料的制备及其电化学性能研究  

Preparation and Electrochemical Performances of NiFe2O4@LiMn2O4 Cathode Material

作　　者：梁力勃 卢德娟 梁晶晶 熊美玉 陈彦辛 赖飞燕 LIANG Li-bo;LU De-juan;LIANG Jing-jing;XIONG Mei-yu;CHEN Yan-xin;LAI Fei-yan(College of Materials and Chemical Engineering,Hezhou University,Hezhou 542899,Guangxi,China;Guangxi Hezhou Guidong Electronic Technology Co Ltd,Hezhou 542899,Guangxi,China)

机构地区：[1]贺州学院材料与化学工程学院,广西贺州542899 [2]广西贺州市桂东电子科技有限责任公司,广西贺州542899

出　　处：《矿冶工程》2020年第2期127-130,135,共5页Mining and Metallurgical Engineering

基　　金：广西高校中青年教师科研基础能力提升项目(2019KY0709);广西自然科学基金重点项目(2013GXNSFDA019027);国家自然科学基金(51762006)。

摘　　要：以溶胶-凝胶法制备了不同质量百分比的NiFe2O4@LiMn2O4复合正极材料。采用X射线衍射、扫描电子显微镜、透射电子显微镜和电化学性能测试等手段,对NiFe2O4@LiMn2O4材料的结构、形貌和电化学性能进行表征。结果表明,NiFe2O4的包覆并没有改变锰酸锂材料的晶体结构;锰酸锂颗粒表面没有观察到NiFe2O4材料存在。当NiFe2O4包覆量为1%时,复合材料具有较好的电化学性能,其首次充放电效率、循环性能和倍率性能都得到了一定程度的提高,此时NiFe2O4呈薄膜型包覆在锰酸锂颗粒的表面,厚度约为14 nm,首次放电比容量(0.1C)为121.2 mAh/g,10C倍率放电条件下放电比容量为84.8 mAh/g,1C循环400周后容量保持率为90.64%。NiFe2O4@LiMn2O4 cathode materials with different coating content of lithium-ion batteries were prepared by a sol-gel method.The crystal structure,particle size,surface morphology and electrochemical performance of the cathode material were characterized by using X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The results show that the coating of NiFe2O4 does not change the crystal structure,and no NiFe2O4 material is observed on the surface of LiMn2O4 particles.It is found that the prepared composite material with the coating content of NiFe2O4 at 1%exhibits a good electrochemical performance,and has been improved in terms of initial charge-discharge efficiency,cycle performance and multiplier performance.When a film of NiFe2O4 is coated on the LiMn2O4 surface,14 nm in thickness,the initial discharge specific capacity is 121.2 mAH/g at 0.1 C and 84.8 mAh/g at 10 C,with the capacity retention rate at 90.64%after 400 cycles at 1 C rate.

关 键 词：锂离子电池 正极材料 锰酸锂 铁酸镍 表面包覆 

分 类 号：TM911[电气工程—电力电子与电力传动]