期刊
NANO LETTERS
卷 16, 期 2, 页码 864-870出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03217
关键词
Lithium-sulfur batteries; nitrogen-doped graphene; crumpled graphene; high sulfur content; high areal capacity
类别
资金
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of U.S. Department of Energy [DE-EE0005475]
Herein, we report a synthesis of highly crumpled nitrogen doped graphene sheets with ultrahigh pore volume (5.4 cm(3)/g) via a simple thermally induced expansion strategy in absence of any templates. The wrinkled graphene sheets are interwoven rather than stacked, enabling rich nitrogen-containing active sites. Benefiting from the unique pore structure and nitrogen-doping induced strong polysulfide adsorption ability, lithium-sulfur battery cells using these wrinkled graphene sheets as both sulfur host and interlayer achieved a high capacity of similar to 1000 mAh/g and exceptional cycling stability even at high sulfur content (>= 80 wt %) and sulfur loading (5 mg sulfur/cm(2)). The high specific capacity together with the high sulfur loading push the areal capacity of sulfur cathodes to similar to 5 mAh/cm(2), which is outstanding compared to other recently developed sulfur cathodes and ideal for practical applications.
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