Synthesis and Characterization of Mg_3(PO_4)_2-coated Li_(1.05)Ni_(1/3)Mn_(1/3)Co_(1/3)O_2 Cathode Material for Li-ion Battery

作     者：陈玉红 CHEN Yuhong1, TANG Zhiyuan2, ZHANG Guoqing3, ZHANG Xuemei1, CHEN Ruizhen1, LIU Yuangang2, LIU Qiang2 (1. Department of Chemical and Environmental Engineering, Hebei Chemical & Pharmaceutical Vocational Technology Colege, Shijiazhuang 050026, China;2. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;3. Department of Maternal and Energy, Guangdong University of Technology, Guangzhou 510090, China)

作者机构：Department of Chemical and Environmental Engineering Hebei Chemical & Pharmaceutical Vocational Technology Colege 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2009年第24卷第3期

页      面：347-353页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Funded by the National Natural Science Foundation of China (No. 20273047) 

主　　题：lithium-ion batteries cathode materials Li1.05Ni1/3Mn1/3Co1/3O2 co-precipitation 

摘      要：Mg3（PO4）2-coated Li1.05Ni1/3Mn1/33Co1/3O2 cathode materials were synthesized via co-precipitation method. The morphology, structure, electrochemical performance and thermal stability were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, cyclic voltammetry（CV）, electrochemical impedance spectroscopy（EIS）, charge/discharge cycling and differential scanning calorimeter （DSC）. SEM analysis shows that Mg3（PO4）2-coating changes the morphologies of their particles and increases the grains size. XRD and CV results show that Mg3（PO4）2-coating powder is homogeneous and has better layered structure than the bare one. Mg3（PO4）2-coating improved high rate discharge capacity and cycle-life performance. The reason why the cycling performance of Mg3（PO4）2-coated sample at 55 ℃ was better than that of room temperature was the increasing of lithium-ion diffusion rate and charge transfer rate with temperature rising. Mg3（PO4）2-coating improved the cathode thermal stability, and the result was consistent with thermal abuse tests using Li-ion cells： the Mg3（PO4）2 coated Li1.05Ni1/3Mn1/3Co1/3O2 cathode did not exhibit thermal runaway with smoke and explosion, in contrast to the cells containing the bare Li1.05Ni1/3Mn1/3Co1/3O2.