Improvement the electrochemical performance of Li1.2Ni0.2Mn0.6O2 electrode with AlF3 added

Journal of Shanghai Jiaotong University (Science) - 2012
Yun-jian Liu1,2,3, San-bing Liu2, Xiao-hua Chen2, Long Chen1
1Automobile Engineering Research Institute, Jiangsu University, Zhenjiang, Jiangsu, China
2Postdoctoral Workstation of Chery Automobile Co., Ltd, Wuhu, Anhui, China
3School of Material Science and Technology, Jiangsu University, Zhenjiang, Jiangsu, China

Tóm tắt

Layered solid solution material Li1.2Ni0.2Mn0.6O2 is synthesized and the AlF3 is added to improve the electrochemical performance. X-ray diffraction (XRD) results show that the Li1.2Ni0.2Mn0.6O2 samples exhibit layered characteristics. The AlF3 additive is detected by transmission electron microscope (TEM) technology. The electrochemical tests show that Li1.2Ni0.2Mn0.6O2 electrode with AlF3 added delivers better discharge capacity (240mA· h/g), first coulomb efficiency 79.2%, cyclic performance (capacity retention ratio of 100.6% after 50 cycles), and rate capacity (68mA · h/g at 10 capacity (C)) than the pristine sample. Electrochemical impedance spectroscopy (EIS) results show that the charge transfer resistance of Li1.2Ni0.2Mn0.6O2 electrode with AlF3 added increases slower than that of pristine Li1.2Ni0.2Mn0.6O2 after cycling, which is responsible for better cyclic and rate performance.

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