کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
182537 459431 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
New approaches to improve cycle life characteristics of lithium–sulfur cells
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
New approaches to improve cycle life characteristics of lithium–sulfur cells
چکیده انگلیسی

Two different approaches were tried for an improvement of the cycle performance of Li–S cells: (1) A mixed polymer binder system of polyvinyl pyrrolidone (PVP) and polyethyleneimine (PEI) was developed to maintain the initial morphology of the carbon electrodes, the positive electrode of the Li–S cells, during charge–discharge cycles; (2) a tetrabutylammonium (TBA)-based mixed salt system was applied to an organic liquid electrolyte of the Li–S cells to change certain chemical reactions of polysulfides in the electrolyte solutions. The Li–S cells with PEI showed a significant improvement in cycle performance as well as in discharge capacity, compared with the Li–S cells using PVP only. The discharge capacity at the 50th cycle was found to be ∼580 mAh/g-sulfur, 83% of an initial capacity (∼720 mAh/g-sulfur), at a high current density of 2.0 mA cm−2. It was observed that the Li–S cells with a mixed electrolyte of 0.5 M LiCF3SO3/0.5 M TBAPF6 did not show a distinct improvement in the aspect of discharge capacity. The Li–S cells, however, showed a significant enhancement in the cycle life characteristics much better than that of Li–S cells with 1.0 M LiCF3SO3.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 9, Issue 2, February 2007, Pages 249–254
نویسندگان
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