不同方法制备富锂层状.pdfVIP

  Scientific Journal of Frontier Chemical Development  December 2012, Volume 2, Issue 4, PP.81‐88  Layered lithium-rich Li[Li Ni Co Mn ]O cathode materials 0.2 0.13 0.13 0.54 2 prepared by different methods and its electrochemical properties # Jingliang Wang, Qichan Xiao, Jingjing Yu, Wenbo Nie, Zhaohui Li Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, China 411105 #Email: lzh69@ Abstract In this work, the layered lithium-rich Li[Li0.2Ni0.13Co0.13Mn0.54]O2 materials were synthesized by sol-gel, co-precipitation and ball-milling methods followed by calcinations at a high temperature. The crystal structure was analysized through X-ray diffractometry (XRD) and morphology by scanning electron microscopy (SEM). The electrochemical properties of products were studied by cyclic voltammetry (CV) and galvanostatic charge-discharge measurements. The results suggest that the products synthesized by sol-gel and co-precipitation methods have perfect layered crystal structure and display uniform particle size. Their initial discharge capacities are as high as 259 and 255 mAh·g-1 at 0.1C, respectively. However, the product prepared by ball-milling method exhibits lager particle size and unsatisfied electrochemical properties such as its initial discharge capacity of -1 at 0.1C. 153 mAh·g Key words: Lithium-Ion Batteries; Li[Li Ni Co Mn ]O ; Sol-Gel; Co-Precipitation; Ball-Millin