کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5148735 | 1497864 | 2017 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Harvesting polysulfides by sealing the sulfur electrode in a composite ion-selective net
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A cathode was prepared by sealing a carbon supported sulfur electrode inside a composite ion-selective net made of carbon, binder and lithiated ionomer to restrict shuttling of polysulfide anionic species. As a result, the soluble polysulfide anions become unable to escape from the composite ion-selective films due to the electrostatic repulsion between the immobilized single ion conducting ionomers and the polysulfides with no dead angles. Experimentally, lithiated 4,4â²-difluoro bis(benzene sulfonyl)imide and PEG200 were copolymerized to form a polyether based single ion conducting polymer. The ionic conductivity of the blend film made of ionomer and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) at a mass ratio of 1:1 is 0.57Â mSÂ cmâ1 at room temperature. The battery capacity with the sealed sulfur electrode is 1412Â mAh gâ1 at 0.5Â C, 1041Â mAh gâ1 at 1.0Â C, 873Â mAh gâ1 at 2.0Â C and 614Â mAh gâ1 at 5.0Â C, significantly better than the results with lithiated Nafion especially at high C rates. In addition, a long cycling test at 2Â C for 500 cycles gives rise to a stable capacity of 800Â mAh gâ1. The intrinsic electrostatic repulsion between polysulfide anions and the negatively charged electrolyte film, together with the overall sealed electrode configuration, is responsible for blocking the shuttling of polysulfides effectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 368, 15 November 2017, Pages 38-45
Journal: Journal of Power Sources - Volume 368, 15 November 2017, Pages 38-45
نویسندگان
Yazhou Chen, Zhong Li, Xuekui Li, Danli Zeng, Guodong Xu, Yunfeng Zhang, Yubao Sun, Hanzhong Ke, Hansong Cheng,