Citation: ZHAO Xue-Ling, TANG Dao-Ping, MAI Yong-Jin, ZHAO Xin-Yue, WANG Su-Qing, ZHANG Ling-Zhi. Characterization of Li-Rich Cathode Material Li[Li0.2Ni0.2Mn0.6]O2 Synthesized by Sol-Gel Method for Lithium-Ion Batteries[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(5): 1013-1018. doi: 10.3969/j.issn.1001-4861.2013.00.149
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Li-rich solid solution cathode material Li[Li0.2Ni0.2Mn0.6]O2 was synthesized by a sol-gel method and subsequent solid-state sintering process, using LiOH·H2O, Mn(CH3COO)2·4H2O and H3COO)2·4H2O as raw materials, and citric acid (CA) and ethylene diamine tetraacetic acid (EDTA) as chelating agents, respectively. The as-synthesized materials were characterized by X-ray diffraction, scanning electron microscope and Laser Particle Size Analyzer, and the electrochemical properties of materials were investigated. The material using CA as chelating agent showed higher capacity and better rate performance than that using EDTA as chelating agent. The half-cell of Li/Li[Li0.2Ni0.2Mn0.6]O2 using CA as chelating agent delivered a charge specific capacity of 324 mAh·g-1 with an initial efficiency of 82% at a current density of 18 mA·g-1 between 2.0 and 4.8 V, and retained the reversible capacity of 120 mAh·g-1 even at a high current density of 180 mA·g-1.
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