کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
181684 459408 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Is small particle size more important than carbon coating? An example study on LiFePO4 cathodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Is small particle size more important than carbon coating? An example study on LiFePO4 cathodes
چکیده انگلیسی

Based on careful analysis of nine papers by different research groups, we show, for the first time, that in LiFePO4-based cathode materials the electrode resistance depends solely on the mean particle size. The effect of carbon coating is marginal, it suffices that each LiFePO4 particle is point-contacted with a reasonable number of carbon black particles usually added in the course of electrode preparation. We present a simple but general theoretical model that consistently explains this unexpected result. The main reason for the relatively small importance of carbon coatings is the fact that the ionic conductivity (ca. 10−11–10−10 S cm−1 at RT) is much smaller than the electronic (>10−9 S cm−1 at RT). The present finding could be of significant importance not only for further optimization of LiFePO4 cathodes, but also for preparation of other cathode materials in which the ionic conductivity is much lower than the electronic.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 9, Issue 12, December 2007, Pages 2778–2783
نویسندگان
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