کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
9760260 1498045 2005 8 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
High-performance LiCoO2 by molten salt (LiNO3:LiCl) synthesis for Li-ion batteries
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موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
High-performance LiCoO2 by molten salt (LiNO3:LiCl) synthesis for Li-ion batteries
چکیده انگلیسی
In an effort to increase and sustain the reversible capacity of LiCoO2 on cycling, LiCoO2 is prepared by using the molten-salt of the eutectic LiNO3-LiCl at temperatures 650-850 °C with or without KOH as an oxidizing flux. The compounds are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), chemical analysis, surface area and density techniques. Cathodic behaviour was examined by cyclic voltammetry (CV) and charge-discharge cycling. The 850 °C-synthesized LiCoO2, which has excess lithium incorporated in to it, shows a reversible capacity, with ∼98% coulombic efficiency, of 167 (±2) mAh g−1 at a specific current of 30 mAg−1 in the range 2.5-4.4 V up to 80 cycles with no capacity-fading. When cycled to a higher cut-off voltage (4.5 V), a capacity of 192 (±2) mAh g−1 versus Li is obtained at the fifth cycle, but capacity-fading is observed, viz., ∼ 6% after 60 cycles. On the basis of the CV and capacity-voltage profiles, this is attributed to the non-suppression of the hexagonal (H1) ↔ (H1-3) structural transition. A similar capacity-fading, i.e., ∼5-6%, during 5-40 cycles, is also observed in the LiCoO2 prepared at 650 and 750 °C when cycled up to only 4.3 V and this is ascribed to the non-suppression of the H1 ↔ M ↔ H1 phase transitions (M = monoclinic).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 147, Issues 1–2, 9 September 2005, Pages 241-248
نویسندگان
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