Abstract: A series of Li-rich manganese cathode materials Li1.2Ni0.13Co0.13Mn0.54-xZnxO2(x=0, 0.03, 0.06, 0.10) were synthesized through a high temperature solid state route, and influences of Zn2+ doping on surface property and electrochemical performance of the layered Li1.2Ni0.13Co0.13Mn0.54O2 were studied. X-ray diffractometry (XRD), scanning electron microscopy (SEM), Raman spectroscopy, charge-discharge measurements and electrochemical impedance spectroscopy were adopted to analyze and determine the crystal structures, appearance characteristics, microstructures and electrochemical performances of the synthesized catho-des. The as-synthesized Li-rich manganese cathode materials are a-NaFeO2 layered structure,which belongs to R-3m space group, with high crystallinity and structural stability. The electrochemical performance of Li1.2Ni0.13Co0.13Mn0.48Zn0.06O2 was better than the other cathodes. We proved that Zn2+ doping can improve the electrochemical properties of Li-rich manganese cathode material, such as charge and discharge specific capacity, rate performance and cycling performance.
1 He P, Yu H, Li D, et al. Layered lithium transition metal oxide cathodes towards high energy lithium-ion batteries[J]. J Mater Chem,2012,22(1):3680. 2 Zhecheva E, Stoyanova R, Alcantara R, et al. Cation order/disorder in lithium transition-metal oxides as insertion electrodes for lithium-ion batteries[J]. Pure Appl Chem,2002,74(6):1881. 3 Jafta C, Ozoemena K, Mathe M, et al. Characterisation and electrochemical intercalation kinetics of nanostructured aluminium-doped Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode material for lithium ion battery[J]. Electrochim Acta,2012,85(13):411. 4 Luo W, Dahn J R. The impact of Zr substitution on the structure electrochemical performance and thermal stability of Li[Ni1/3-Mn1/3-zCo1/3Zrz]O2[J]. J Electrochim Soc,2011,158(4):A424. 5 Liao L, Wang X Y, Luo X F, et al. Synthesis and electrochemical properties of layered LiNi0.333Co0.333Mn0.293Al0.04O2-zFzcathode materials prepared by the sol-gel method[J]. J Power Sources,2006,160(4):653. 6 Qi Y, Huang Y, Jia D, et al. Preparation and characterization of novel spinel Li4Ti5O12-xBrx anode materials[J]. Electrochim Acta,2009,54(3):4770. 7 Woo S U, Yoon C S, Amine K, et al. Significant improvement of electrochemical performance of AlF-coated Li[Ni0.8Co0.1Mn0.1]O2 cathode materials[J]. J Electrochim Soc,2007,154(4):A1000. 8 Park J H, Lim J, Yoon J, et al. The effects of Mo doping on 0.3Li-[Li0.33Mn0.67]O2·0.7Li[Ni0.5Co0.2Mn0.3]O2 cathode material[J]. Dalton Trans,2012,41(10):3053. 9 He Z, Wang Z, Cheng L, et al. Structural and electrochemical cha-racterization of layered 0.3Li[Li2MnO3·0.7LiMn0.35-x/3Ni0.35-x/3-Co0.15-x/3CrxO2 cathode synthesized by spray drying[J]. Adv Powder Technol,2014,25(2):647. 10 Hu W,Zhong S W,Huang B. Optimizing electrochemical properties in Li-rich Mn-based cathode material[J]. Nonferrous Metals Sci Eng,2014,4(5):32(in Chinese). 胡伟,钟盛文,黄冰. 富锂锰基正极材料的改性及电化学性能研究[J]. 有色金属科学与工程,2014,4(5):32.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2017, Vol. 31 
