کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990061 | 1516125 | 2018 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hierarchically porous TiO2 matrix encapsulated sulfur and polysulfides for high performance lithium/sulfur batteries
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
A hierarchically porous TiO2 matrix was synthesized via a facile dealloying method for high-performance lithium/sulfur batteries. The dealloying processing forms an interconnected porous structure with high porosity (0.39â¯cm3â¯gâ1) and large surface area (82.39â¯m2â¯gâ1). The specific structure provides effective contact between sulfur and host material, thus trapping the polysulfide intermediates and suppressing the shuttle effect. The resulting S/TiO2 composites exhibit excellent cycling and rate performance, which maintained 641â¯mAh gâ1 at 200th cycle at 0.2â¯C, and 600â¯mAh gâ1 at 2.5â¯C. The coulombic efficiency remains at nearly 99% except for the first cycle. This excellent electrochemical performance of S/TiO2 composites can be attributed to the strong electrostatic attraction between metal-oxygen bond and polysulfides and structural restriction to encapsulate sulfur of hierarchically porous TiO2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 769, 15 November 2018, Pages 678-685
Journal: Journal of Alloys and Compounds - Volume 769, 15 November 2018, Pages 678-685
نویسندگان
Ning Liu, Lu Wang, Yan Zhao, Taizhe Tan, Yongguang Zhang,