کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5149947 | 1497896 | 2016 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural and electrochemical analysis of Zn doped Na3Ni2SbO6 cathode for Na-ion battery
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effect of Zn2+ substitution on the electrochemical performance and the structural evolution upon cycling of Na3Ni2SbO6 and Na3Zn0.5Ni1.5SbO6 is reported. Samples were synthesized by solid state route and characterised by ex-situ X-ray diffraction and ex-situ 23Na solid state NMR, the results show that the partial substitution of Ni2+ by Zn2+ alters the superstructure symmetry and leads to a disordered lattice. This structural reorganisation has direct consequences on the electrochemical performances of Na3Zn0.5Ni1.5SbO6 with an average voltage of â¼3.3Â V and with a specific capacity increase up to 145Â mAh.gâ1 at C/10. We observe that Zn2+ cations are inhomogeneously distributed in the structure, leading to different Na+ environments which are characterized by NMR. The phase transitions observed at high voltage in Na3Ni2SbO6 are suppressed in Na3Ni1.5Zn0.5SbO6 resulting in a smooth electrochemical profile with a low polarization. The presence of an irreversible phase at the end of the discharge was also detected in the undoped material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 336, 30 December 2016, Pages 186-195
Journal: Journal of Power Sources - Volume 336, 30 December 2016, Pages 186-195
نویسندگان
Frederic Aguesse, Juan-Miguel Lopez del Amo, Laida Otaegui, Eider Goikolea, Teofilo Rojo, Gurpreet Singh,