J Shanghai Jiaotong Univ Sci

Journal of shanghai Jiaotong University (Science) ›› 2012, Vol. 17 ›› Issue (6): 697-700.doi: 10.1007/s12204-012-1348-z

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Improvement the Electrochemical Performance of Li1.2Ni0.2Mn0.6O2 Electrode with AlF3 Added

Improvement the Electrochemical Performance of Li1.2Ni0.2Mn0.6O2 Electrode with AlF3 Added

LIU Yun-jian1,2,3* (刘云建), LIU San-bing2 (刘三兵), CHEN Xiao-hua2 (陈效华), CHEN Long3 (陈龙)   

  1. (1. School of Material Science and Technology, Jiangsu University, Zhenjiang 212013, Jiangsu, China; 2. Postdoctoral Workstation of Chery Automobile Co., Ltd., Wuhu 241009, Anhui, China; 3. Automobile Engineering Research Institute, Jiangsu University, Zhenjiang 212013, Jiangsu, China)
  2. (1. School of Material Science and Technology, Jiangsu University, Zhenjiang 212013, Jiangsu, China; 2. Postdoctoral Workstation of Chery Automobile Co., Ltd., Wuhu 241009, Anhui, China; 3. Automobile Engineering Research Institute, Jiangsu University, Zhenjiang 212013, Jiangsu, China)
  • Online:2012-12-31 Published:2012-12-30
  • Contact: LIU Yun-jian1,2,3* (刘云建) E-mail:lyjian122331@yahoo.com.cn

Abstract: 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.

Key words: Li-ion battery| Li1.2Ni0.2Mn0.6O2 cathode| AlF3 added| electrochemical performance

摘要： 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.

关键词: Li-ion battery| Li1.2Ni0.2Mn0.6O2 cathode| AlF3 added| electrochemical performance

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