期刊
SMALL METHODS
卷 2, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.201800067
关键词
high energy density; high sulfur loading; lithium-sulfur batteries
资金
- Australian Research Council under Discovery Project Funding Scheme [DP150102044, DP150102025, DP180100731]
- National Natural Science Foundation of China [51525206, 51625203, 51521091, U1401243]
- National Key R&D Program of China [2016YFA0200102, 2016YFB0100100, 2014CB932402]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2015150]
- Institute of Metal Research [2015-PY03]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010104]
- Key Research Program of the Chinese Academy of Sciences [KGZD-EW-T06]
- Chinese Academy of Sciences/State Administration of Foreign Experts Affairs (CAS/SAFEA) International Partnership Program for Creative Research Teams
Lithium-sulfur (Li-S) batteries are highly attractive as next-generation electrochemical energy-storage technologies because they can provide a high energy density at a low cost. However, the performance degradation of sulfur cathodes with high mass loadings remains a significant challenge to be addressed. Here, a 3D multifunctional integrated and sponge-like architecture is designed as the cathode framework, which provides a favorable balance between high sulfur loadings and uncompromised electrochemical performances. In this architecture, a highly porous nitrogen-doped carbon fiber foam is used as a 3D current collector and host for sulfur accommodation and a thin graphene layer is used for polysulfide interception, which not only facilitates fast electron and lithium-ion transport but also enables effective active material immobilization by both physical restriction and chemical adsorption. With a sulfur loading of 7.7 mg cm(-2), high areal capacities up to 8.7 mAh cm(-2) are attained together with excellent cycling stability over 500 cycles. This approach demonstrates a new concept for the construction of cathode architectures for practical Li-S batteries and can be extended to other battery systems.
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