Y_2O_3/Al_2O_3复合包覆对LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2电化学性能的影响  

Effect of Y_2O_3/Al_2O_3 coating on electrochemical performance of LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2

作　　者：许军娜 朱健 周友元 习小明 陈晓青[4] XU Jun-na;ZHU Jian;ZHOU You-yuan;XI Xiao-ming;CHEN Xiao-qing(Kingray New Materials Science&Technology Co.,Ltd.,Changsha Hunan 410012,China;School of Materials and Environmental Enginnering,Hunan University of Humanities,Science and Technology,Loudi Hunan 417000,China;Hunan Changyuan LiCo Co.,Ltd.,Changsha Hunan 410205,China;College of Chemistry and Chemical Engineering,Central South University,Changsha Hunan 410083,China)

机构地区：[1]金瑞新材料科技股份有限公司,湖南长沙410012 [2]湖南人文科技学院材料与环境工程学院,湖南娄底417000 [3]湖南长远锂科有限公司,湖南长沙410205 [4]中南大学化学化工学院,湖南长沙410083

出　　处：《电源技术》2018年第9期1266-1269,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51474037);国家重点研发计划(2016YFB0100400)

摘　　要：以Y_2O_3和Al_2O_3溶胶为包覆前驱物,对LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2进行了表面包覆改性。X射线衍射光谱法(XRD)测试表明,Y_2O_3/Al_2O_3包覆并未影响LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2的晶体结构,仍为良好的a-NaFeO_2层状结构。扫描电子显微镜法(SEM)测试表明,氧化物在正极材料表面均匀分布。与未包覆LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2相比,3.0~4.4 V测试电压下,Y_2O_3/Al_2O_3包覆后的容量保持率提高了约15%。CV和EIS测试表明,Y_2O_3/Al_2O_3包覆后LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2的极化和电荷转移电阻明显减小,有效降低了电解液与正极材料的副反应,提高了电化学性能。The surface of LiNi0.5Co0.2Mn0.3O2 was modified by complex oxides using Y2O3 and Al2O3 sol as precursors.XRD indicated that the crystal structure was not affected by Y2O3/Al2O3 coating,it still retain the layer a-NaFeO2 structure.SEM demonstrated that the oxides were homogenously distributed on the surface of LiNi0.5Co0.2Mn0.3O2.Compared with uncoated LiNi0.5Co0.2Mn0.3O2,the capacity retention increased about 15%after coating at the voltage of 3.0~4.4 V.The CV and EIS test showed that the polarization and the charge transfer resistance of LiNi0.5Co0.2Mn0.3O2 decreased after coating.The side effect between electrode and electrolyte was reduced after coating and the electrochemical performance of the cathode material was improved.

关 键 词：LiNi0.5Co0.2Mn0.3O2 表面包覆 Y2O3/Al2O3 

分 类 号：TM912[电气工程—电力电子与电力传动]