Synthesis and characterization of Mg3(PO4)2-coated Li1.05Ni1/3Mn1/3Co1/3O2 cathode material for Li-ion battery

Yuhong Chen; Zhiyuan Tang; Guoqing Zhang; Xuemei Zhang; Ruizhen Chen; Yuangang Liu; Qiang Liu

doi:10.1007/s11595-009-3347-y

Journal of Wuhan University of Technology Materials Science Edition ›› 2009, Vol. 24 ›› Issue (3) : 347 -353. DOI: 10.1007/s11595-009-3347-y

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Synthesis and characterization of Mg₃(PO₄)₂-coated Li_1.05Ni_1/3Mn_1/3Co_1/3O₂ cathode material for Li-ion battery

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Abstract

Mg₃(PO₄)₂-coated Li_1.05Ni_1/3Mn_1/3Co_1/3O₂ 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 Li_1.05Ni_1/3Mn_1/3Co_1/3O₂ cathode did not exhibit thermal runaway with smoke and explosion, in contrast to the cells containing the bare Li_1.05Ni_1/3Mn_1/3Co_1/3O₂.

Keywords

lithium-ion batteries / cathode materials / Li_1.05Ni_1/3Mn_1/3Co_1/3O₂ / co-precipitation

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Yuhong Chen, Zhiyuan Tang, Guoqing Zhang, Xuemei Zhang, Ruizhen Chen, Yuangang Liu, Qiang Liu. Synthesis and characterization of Mg₃(PO₄)₂-coated Li_1.05Ni_1/3Mn_1/3Co_1/3O₂ cathode material for Li-ion battery. Journal of Wuhan University of Technology Materials Science Edition, 2009, 24(3): 347-353 DOI:10.1007/s11595-009-3347-y

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