Synthesis and characterization of Mg3(PO4)2-coated Li1.05Ni1/3Mn1/3Co1/3O2 cathode material for Li-ion battery |
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| Authors: | Yuhong Chen Zhiyuan Tang Guoqing Zhang Xuemei Zhang Ruizhen Chen Yuangang Liu and Qiang Liu |
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| Affiliation: | (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 |
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| Abstract: | Mg3(PO4)2-coated Li1.05Ni1/3Mn1/3Co1/3O2 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 °C 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.
Funded by the National Natural Science Foundation of China (No. 20273047) |
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| Keywords: | lithium-ion batteries cathode materials Li1 05Ni1/3Mn1/3Co1/3O2 co-precipitation |
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