Copper surface doping to improve the structure and surface properties of manganese-rich cathode materials for sodium ion batteries
作者： Tao Chen , Weifang Liu , Yi Zhuo , Hang Hu , Jing Guo
DOI: 10.1039/C9QM00522F
关键词: Oxide 、 Electrolyte 、 Copper 、 Dielectric spectroscopy 、 Electrode 、 Surface layer 、 Manganese 、 Chemical engineering 、 Cathode 、 Materials science
摘要: A facile copper surface doping process is proposed to enhance the structural stability of manganese-rich layered oxide cathodes. Herein, structure P2-type Na0.67Mn0.6Ni0.2Co0.2O2 was stabilized via formation a copper-rich layer. This layer can reduce dissolution manganese in electrolyte and inhibit side reactions at electrode/electrolyte interface. Expanded lattice channels induced by contributed improvement Na+ mobility. In addition, it be deduced from scanning transmission electron microscopy (STEM) images that resulted transition P2 phase P3 phase. Electrochemical impedance spectroscopy (EIS) measurements confirmed both irreversible reaction resistance charge transfer surface-doped (Cu-MNC) were significantly reduced. More importantly, Cu-MNC electrode delivered an initial specific capacity 122.2 mA h g−1 with retention up 83.3% after 150 cycles 0.2C. After refreshing sodium metal anode electrolyte, showed high 102.4 84.14% 200 cycles. These results open new method optimize materials for SIBs.
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