标题：Synthesis and Characterization of Gradient Cathode Material for Lithium-ion Batteries
作者：Dong, Tao; Zhang, Lipeng; Yu, Xianjin; Zhao, Zengdian; Dong, Yunhui
作者机构：[Dong, Tao; Zhang, Lipeng; Yu, Xianjin; Zhao, Zengdian; Dong, Yunhui] Shandong Univ Technol, Sch Chem Engn, Zibo 255091, Peoples R China.
会议名称：International Symposium on Chemical Engineering and Materials Properties (ISCEMP 2011)
会议日期：NOV 04-06, 2011
来源：CHEMICAL ENGINEERING AND MATERIAL PROPERTIES, PTS 1 AND 2
关键词：Lithium ion battery; Gradient material; Multiple co-precipitation;; LiNi0.7Co0.15Mn0.15O2
摘要：Gradient cathode material of LiNi0.7Co0.15Mn0.15O2 was synthesized by mixing hydroxide co-precipitated precursors with 8% excess LiOH center dot H2O. Structure and electrochemical properties of the material was characterized by X-ray diffraction (XRD), scanning electronic microscope (SEM), galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The results indicate that the typical crystal of the material is alpha-NaFeO2. The particles are formed by 200nm similar to 500nm crystals. The gradient material sintered at 800 degrees C shows the best electrochemical performance, the initial discharge capacity of the material is 164.45mAh.g(-1) at 0.2C, its discharge capacity retention of 86% at 2C and with lower electrochemical impedance.