کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5437365 1398173 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of molybdenum substitution on electrochemical performance of Li[Li0.2Mn0.54Co0.13Ni0.13]O2 cathode material
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Effect of molybdenum substitution on electrochemical performance of Li[Li0.2Mn0.54Co0.13Ni0.13]O2 cathode material
چکیده انگلیسی
Molybdenum doping is introduced to improve the electrochemical performance of lithium-rich manganese-based cathode material. X-ray diffraction (XRD) results illustrate that the crystallographic parameters a, c and lattice volume V become larger with the increase of Mo content. The scanning electron microscope (SEM) shows that the molybdenum substitution increases the crystallinity of the primary particles. When evaluated as cathode material, the as-prepared Li[Li0.2Mn0.54-x/3Ni0.13-x/3Co0.13-x/3Mox]O2 (x = 0.007) delivers a discharge capacity of 155.5 mA h g−1 at 5 C (1 C = 250 mA g−1) and exhibits the capacity retention of 81.8% at 1 C after 200 cycles. The results of cyclic voltammetry (CV) and electronic impedance spectroscopy (EIS) tests reflect that the molybdenum substitution is able to significantly reduce the electrode polarization and lower the charge-transfer resistance. Within appropriate amount of Mo doping, the lithium ion diffusion coefficient of the material can reach to 8.92 × 10-15 cm2 s−1, which is ~ 30 times higher than that of pristine materials (2.65 × 10-16 cm2 s−1).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 17, 1 December 2017, Pages 14836-14841
نویسندگان
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