کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10267145 459445 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-temperature storage and cycling of C-LiFePO4/graphite Li-ion cells
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
High-temperature storage and cycling of C-LiFePO4/graphite Li-ion cells
چکیده انگلیسی
The high-temperature storage and cycling characteristics of prismatic Li-ion cells with carbon-coated LiFePO4 cathodes, MCMB graphite anodes and a LiPF6/EC-DEC electrolyte were investigated. The cells showed a significant capacity fade when cycled at 37 and 55 °C. Li-Sn reference electrode studies indicated that the interfacial impedance of the graphite electrode increased significantly during high-temperature cycling. Carbon-coated LiFePO4 electrodes were found to release iron ions into the electrolyte when aged at these temperatures; EDAX analyses confirmed the presence of iron at the surface of the graphite electrodes. The observed impedance rise of the graphite electrodes and the consequent capacity fade of the cells were attributed to the formation of interfacial films that were produced on the graphite electrodes as a result of possible catalytic effects of the metallic iron particles. The cycling stability of the cells was improved significantly when the LiPF6 electrolyte salt was replaced with the lithium bis-oxalatoborate LiB(C2O4)2 salt.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 7, Issue 7, July 2005, Pages 669-673
نویسندگان
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