期刊
NANO RESEARCH
卷 12, 期 4, 页码 759-766出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-019-2282-2
关键词
physical activation; 3D-graphene; solvothermal microwave synthesis; Li-S battery
类别
资金
- Ministerio de Economia y Competitividad [MAT2017-87541-R]
- Junta de Andalucia [FQM-175]
- University of Ferrara
- Ministry of Economy and Competitiveness (Spain) (MINECO) [CTQ2015-68951-C3-3R]
- FEDER
Graphene nanosheets are a promising scaffold to accommodate S for achieving high performance Li/S battery. Nanosheet activation is used as a viable strategy to induce a micropore system and further improve the battery performance. Accordingly, chemical activation methods dominate despite the need of multiple stages, which slow down the process in addition to making them tiresome. Here, a three-dimensional (3D) N-doped graphene specimen was physically activated with CO2, a clean and single step process, and used for the preparation of a sulfur composite (A-3DNG/S). The A-3DNG/S composite exhibited outstanding electrochemical properties such as an excellent rate capability (1,000 mAhg(-1) at 2C), high reversible capacity and cycling stability (average capacity 800 mAhg(-1) at 1C after 200 cycles), values which exceed those measured in chemically activated graphene. Therefore, these results support the use of physical activation as a simple and efficient alternative to improve the performance of carbons as an S host for high-performance Li-S batteries.
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