کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6472708 | 1424135 | 2016 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Enhanced electrochemical performance of Lithium Metasilicate-coated LiNi0.6Co0.2Mn0.2O2 Ni-rich cathode for Li-ion batteries at high cutoff voltage Enhanced electrochemical performance of Lithium Metasilicate-coated LiNi0.6Co0.2Mn0.2O2 Ni-rich cathode for Li-ion batteries at high cutoff voltage](/preview/png/6472708.png)
- Li2SiO3-coated LiNi0.6Co0.2Mn0.2O2 cathode is prepared by a direct and convenient method.
- The Li2SiO3-coated improves the cycle stability of the material.
- The 3.0Â mol.% Li2SiO3-coated LiNi0.6Co0.2Mn0.2O2 exhibits best electrochemistry properties.
- The Li2SiO3-coated LiNi0.6Co0.2Mn0.2O2 presents excellent rate property.
Li2SiO3-coated LiNi0.6Co0.2Mn0.2O2 cathode material has been synthesized and exhibit much better electrochemical performance than pristine LiNi0.6Co0.2Mn0.2O2 at cut-off voltage 4.6 V. The as-prepared samples are characterized by X-ray diffraction, field emission scanning electron microscopy, field emission transmission electron microscope, and X-ray photoelectron spectroscopic. The results show that the coating-layer Li2SiO3 is not incorporated into the LiNi0.6Co0.2Mn0.2O2 host structure and coated well on the surface of the active material. The sample coated with 3 mol. % Li2SiO3 delivers a capacity of 168 mAh gâ1 at 0.2 C after 100 cycles, and remains 85.5% of the first discharge capacity. The capacity retention at 1C is 73.6% after 100 cycles and the first discharge capacity reaches 158 mAh gâ1 at 10 C. This superior performance is attributed to the coating layer which restrains the side reactions at electrode/electrolyte interface and enhances structure stability, meanwhile, it can decrease the electrode polarization because it is an excellent Li+-ion conductor.
110
Journal: Electrochimica Acta - Volume 222, 20 December 2016, Pages 806-813