کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4767361 | 1424132 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-rate and long-life performance of a truncated spinel cathode material with off-stoichiometric composition at elevated temperature
ترجمه فارسی عنوان
عملکرد بالا و عمر طولانی مدت مواد مغناطیسی کپسول مختلط با ترکیب بدون استئشیومتر در دمای بالا
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
A truncated octahedral structure spinel cathode material with a nominal composition of Li1.08Al0.08Mn1.85Co0.05O3.9F0.1 (LAMCOF) and an Al-rich surface layer is successfully prepared by a sol-gel route combined with a temperature-controlled heat-treatment process. Concentration gradient of Mn4+ ions is found to decrease through the surface to the interior of the as-prepared sample. As the consequence, the LAMCOF sample delivers high rate capability and excellent cycling stability at elevated temperature, showing an initial discharge capacity of 111.1 mAh gâ1 and capacity retention of 70.5% over 850 cycles at 1C rate under 55 °C. Even at 5C rate under 55 °C, it also displays a high capacity of 102.5 mAh gâ1 with capacity retention of 80.0% over 850 cycles. These results reveal the importance of an off-stoichiometric strategy and a temperature-controlled heat-treatment process for the preparation of LiMn2O4-based spinel cathode material with unique crystal orientation and Mn4+-rich surface layer, which both decrease the Mn dissolution and provide interfacial stability while preserving fast Li+ diffusion, resulting in improvement of cycle performance and rate capability of the as-prepared material. This proposed synthesis method does not need a supplementary coating process and is likely suitable to prepare other high performance cathode materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 225, 20 January 2017, Pages 198-206
Journal: Electrochimica Acta - Volume 225, 20 January 2017, Pages 198-206
نویسندگان
Chunxiang Yang, Yuanfu Deng, Man Gao, Xianfeng Yang, Xusong Qin, Guohua Chen,