Cobalt in Nitrogen-Doped Graphene as Single-Atom Catalyst for High-Sulfur Content Lithium−Sulfur Batteries

doi:10.1021/jacs.8b12973

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/116560

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题名:	Cobalt in Nitrogen-Doped Graphene as Single-Atom Catalyst for High-Sulfur Content Lithium−Sulfur Batteries
作者:	Zhenzhen Du;Xingjia Chen;Wei Hu;Chenghao Chuang;Shuai Xie;Ajuan Hu;Wensheng Yan;Xianghua Kong;Xiaojun Wu;Hengxing Ji;Li-Jun Wan
日期:	2019-02-14
上传时间:	2019-05-08 12:10:20 (UTC+8)
摘要:	Because of their high theoretical energy density and low cost, lithium–sulfur (Li–S) batteries are promising next-generation energy storage devices. The electrochemical performance of Li–S batteries largely depends on the efficient reversible conversion of Li polysulfides to Li2S in discharge and to elemental S during charging. Here, we report on our discovery that monodisperse cobalt atoms embedded in nitrogen-doped graphene (Co–N/G) can trigger the surface-mediated reaction of Li polysulfides. Using a combination of operando X-ray absorption spectroscopy and first-principles calculation, we reveal that the Co–N–C coordination center serves as a bifunctional electrocatalyst to facilitate both the formation and the decomposition of Li2S in discharge and charge processes, respectively. The S@Co–N/G composite, with a high S mass ratio of 90 wt %, can deliver a gravimetric capacity of 1210 mAh g–1, and it exhibits an areal capacity of 5.1 mAh cm–2 with capacity fading rate of 0.029% per cycle over 100 cycles at 0.2 C at S loading of 6.0 mg cm–2 on the electrode disk.
關聯:	Journal of American Chemical Society 141(9), p.3977–3985
DOI:	10.1021/jacs.8b12973
显示于类别:	[物理學系暨研究所] 期刊論文

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