Synthesis and characterization of Li1.05Co0.3Ni0.35Mn0.3M0.05O2 (M=Ge,Sn)cathode materials for lithium ion battery |
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Authors: | Yuhong Chen Yongzhen Li Guizhen Wang Qing Di Yushuang Shen Na Sun Zhiyuan Tang |
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Affiliation: | 1. Department of Chemical and Environmental Engineering, Hebei Chemical & Pharmaceutical Vocational Technology College, Shijiazhuang, 050026, China 2. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
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Abstract: | In order to improve the electrochemical performance and thermal stability of Li1.05Co1/3Ni1/3Mn1/3O2 materials, Li1.05Co0.3 Ni0.35Mn0.3M0.05O2(M=Ge,Sn) cathode materials were synthesized via co-precipitation method. The structure, electrochemical performance and thermal stability were characterized by X-ray diffraction(XRD), charge/discharge cycling, cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and differential scanning calorimetry(DSC). ESEM showed that Sn-doped and Gedoped slightly increased the size of grains. XRD and CV showed that Sn-doped and Ge-doped powders were homogeneous and had the better layered structure than the bare one. Sn-doped and Ge-doped improved high rate discharge capacity and cycle-life performance. The reason of the better cycling performance of the doped one was the increasing of lithium-ion diffusion rate and charge transfer rate. Sn-doped and Ge-doped also improved the mateials thermal stability. |
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Keywords: | lithium-ion batteries cathode materials Ge-doped Sn-doped co-precipitation |
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