کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
190680 459704 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Insight into the improvement of rate capability and cyclability in LiFePO4/polyaniline composite cathode
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Insight into the improvement of rate capability and cyclability in LiFePO4/polyaniline composite cathode
چکیده انگلیسی

A simple and efficient strategy was employed to enhance high-rate performance for carbon-coated LiFePO4 (C-LFP) by incorporating with conducting polymer polyaniline (PANI). C-LFP was synthesized via a solid state reaction whereas PANI was formed in situ by chemical oxidative polymerization of aniline with ammonium persulfate as an oxidizer to achieve the C-LFP/PANI composites. Specific capacities as high as 165 mAh g−1 at 0.2 C, 133 mAh g−1 at 7 C and 123 mAh g−1 at 10 C were obtained in C-LFP/7 wt.% PANI composite. Moreover, the composite exhibits remarkably improved cyclability as compared with the parent C-LFP. The mechanism has been carefully investigated for the improvement in the electrochemical performance. Experimental results show that the charge transfer impedance decreases significantly and the cathode surface becomes much smooth over cycling with modification of conductive PANI. The incorporated PANI can work not only as an additional host for Li+-ion insertion/extraction, but also as a binder to modify the electrode surface and a container for electrolyte to penetrate into C-LFP particles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 56, Issue 6, 15 February 2011, Pages 2689–2695
نویسندگان
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