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Preparation and Electrochemical Performance of Porous Micro-Nano Structure Layered Li-Rich 0.6Li2MnO3·0.4LiNi0.5Mn0.5O2 Cathode for Lithium-Ion Batteries
Author NameAffiliationE-mail
ZHENG Zhuo Polymer Research Institute, Sichuan University, Chengdu 610065, China  
WU Zhen-Guo School of Chemical Engineering, Sichuan University, Chengdu 610065, China  
XIANG Wei College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610065, China  
YANG Xiu-Shan School of Chemical Engineering, Sichuan University, Chengdu 610065, China yangxs@scu.edu.cn 
Abstract: A Li-rich 0.6Li2MnO3·0.4LiNi0.5Mn0.5O2 cathode material with porous micro-nano spherical structure is prepared using a combination of carbonate co-precipitation and combustion method. Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorpation-desorpation and galvanostatic charge-discharge tests are employed to analyze the crystal structure, micro morphology and electrochemical properties of the as-prepared material. Results indicate that this cathode has a porous micro-nano spherical structure, which is composed of primary particles with a small size about 300 nm. Moreover, this cathode has a well-ordered layered α-NaFeO2 structure (space group R3m) and a high BET specific surface area of 13 m2·g-1. Electrochemical measurements confirm that this cathode has excellent high capacity, good cycling stability and outstanding rate performance. At 2.0~4.8 V, the discharge capacities of the material at 0.1C, 0.2C, 0.5C, 1C, 3C, 5C and 10C are 266, 254, 235, 205, 186, 149 and 107 mAh·g-1, respectively. After 100 cycles at 0.5C, the cathode also exhibits a discharge capacity of 217 mAh·g-1 with capacity retention of 94%.
Keywords: micro-nano structure  carbonate co-precipitation  Li-rich cathodes  electrochemical performance  Lithium-ion batteries
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ZHENG Zhuo,WU Zhen-Guo,XIANG Wei,YANG Xiu-Shan.Preparation and Electrochemical Performance of Porous Micro-Nano Structure Layered Li-Rich 0.6Li2MnO3·0.4LiNi0.5Mn0.5O2 Cathode for Lithium-Ion Batteries[J].Chinese Journal of Inorganic Chemistry,2017,33(3):479-486.
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Chinese Journal of Inorganic Chemistry