纳米Al2O3包覆富锂锰基正极材料Li1.2Ni0.13Co0.13Mn0.54O2的性能研究  

Nano-Al2O3 Coated Li-rich Cathode Material Li1.2Ni0.13Co0.13Mn0.54O2 for Highly Improved Lithium-ion Batteries

作　　者：陈良丹 邹伟 吴亮[1] 夏凡杰 胡执一 李昱[1,2] 苏宝连[1,3] CHEN Liangdan;ZOU Wei;WU Liang;XIA Fanjie;HU Zhiyi;LI Yu;SU Baolian(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Nanostructure Research Centre(NRC),Wuhan University of Technology,Wuhan 430070,China;Laboratory of Inorganic Materials Chemistry(CMI),University of Namur,Namur B-5000,Belgium)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070 [2]武汉理工大学微纳结构研究中心,武汉430070 [3]那慕尔大学无机材料化学实验室,那慕尔B-5000

出　　处：《高等学校化学学报》2020年第6期1329-1336,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:U1663225);国家重点研发计划项目(批准号:2016YFA0202602)资助.

摘　　要：采用纳米三氧化二铝(Al2O3)对富锂锰基正极材料Li1.2Ni0.13Co0.13Mn0.54O2进行表面均匀包覆,并考察了最优纳米Al2O3包覆量下材料的电化学性能.扫描电子显微镜(SEM)和透射电子显微镜(TEM)显示了纳米Al2O3对富锂锰基正极材料表面均匀包覆,X射线衍射分析(XRD)结果表明包覆后富锂材料依然具有良好的层状结构.恒流充/放电循环测试发现,包覆后的Li1.2Ni0.13Co0.13Mn0.54O2材料的首次放电比容量为249.7 mA·h/g,循环100次后的容量保持率为89.5%,与未包覆的Li1.2Ni0.13Co0.13Mn0.54O2材料相比,容量保持率提升约13%.循环伏安(CV)和电化学阻抗(EIS)测试结果表明,纳米Al 2O 3包覆可有效抑制材料极化,降低界面阻抗和电荷转移阻抗,进而提升富锂锰基正极材料的电化学性能.The lithium-rich cathode material Li1.2Ni0.13Co0.13Mn0.54O2 were coated uniformly by nano-Al2O3 for highly stable lithium-ion batteries.The optimum content of nano-Al2O3 coating on the structure,surface morphology and electrochemical properties were systematically studied by X-ray diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).SEM and TEM results show that the surface of the lithium-rich cathode material is evenly coated with nano-Al2O3.XRD results show that the as-synthesized materials have a layered structure.Electrochemical test results show that the nano-Al2O3 coating is beneficial to improving the discharge specific capacity,rate performance and cycle stability.The nano-Al2O3 coated Li1.2Ni0.13Co0.13Mn0.54O2 material has a specific discharge capacity of 249.7 mA·h/g with excellent cycling stability(89.5% capacity retention after 100 cycles).Cyclic voltammetry(CV)and electrochemical impedance(EIS)results show that nano-Al2O3 coating can effectively inhibit the erosion of HF,reduce electrode material/electrolyte interface side-reactions,decrease polarization,reduce interface impedance and charge transfer impedance.This work suggests that the nano-Al2O3 coating is an effective route to significantly improve the electrochemical performance of lithium-rich cathode materials.

关 键 词：锂离子电池 Li1.2Ni0.13Co0.13Mn0.54O2 纳米三氧化二铝 表面改性 

分 类 号：O646[理学—物理化学]