کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4767389 1424132 2017 33 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of excess Li on the structure and electrochemical performance of Li1+zMnTiO4+δ cathode for Li-ion batteries
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Effects of excess Li on the structure and electrochemical performance of Li1+zMnTiO4+δ cathode for Li-ion batteries
چکیده انگلیسی
Spinel-based LiMn2O4 is the most attractive cathode for Li-ion battery due to high voltage, low cost, and non-toxicity. The cycle life of the spinel cathodes could be improved by replacing Mn4+ with Ti4+ leading to the formation of new spinel cathode, LiMnTiO4. However, its application is restricted due to the associated loss in the specific capacity. In this work, spinel-layered Li1+zMnTiO4+δ (z = 0, 0.5, and 1.0; δ is the value to reflect the composite character of the material) cathodes were fabricated to achieve long cycle life, without compromising on the specific capacity. Cathodes with excess Li (z = 0.5 and 1.0) formed a spinel-layered composite structure with notation (1-a)LiMn2-xTixO4.aLi2MnyTi1-yO3 [y = 0.5-((1/a − 1)(1 − x))]. These cathodes exhibited an enhanced specific capacity of ∼218 mAh g−1 (20% higher), with a capacity retention of 94% after 60 cycles. The structural and electrochemical properties of these cathodes were investigated using X-ray diffraction, galvanostatic cycling, cyclic voltammetry, and the galvanostatic intermittent titration technique to understand the mechanisms underlying the enhanced capacity and cycle stability. The effect of the Li-rich layered phase on the electrochemical performance of the Li1+zMnTiO4+δ cathodes was also investigated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 225, 20 January 2017, Pages 458-466
نویسندگان
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