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Scalable High-Areal-Capacity Li–S Batteries Enabled by Sandwich-Structured Hierarchically Porous Membranes with Intrinsic Polysulfide Adsorption
- Source :
- Nano Letters; September 2020, Vol. 20 Issue: 9 p6922-6929, 8p
- Publication Year :
- 2020
-
Abstract
- The key to realizing practical applications of Li–S batteries lies in scalable fabrication of cathode materials with high sulfur-loading and strong binding of lithium polysulfides (LiPSs). We report a scalable CeO2–CNT@C porous membrane with a large porosity of 90%. Introducing CNTs is critical to increase the porosity and construct porous networks with CNTs as the skeleton and CeO2-doped carbon as the shell. The macropores can improve the transport of Li+and electrolyte, while the porous networks possess high polysulfide-adsorbing and electron-transferring ability. The CeO2–CNT@C membrane can serve as an Al foil-free cathode and an interlayer for Li–S batteries. Moreover, CeO2can immobilize LiPSs and can alleviate its shuttle effect. The Li–S batteries with a sulfur loading of 6.2 mg cm–2deliver a capacity of 847 mA h g–1after 100 cycles, showing a high areal capacity of 5.25 mA h cm–2at a low electrolyte/sulfur ratio of 5.2 μL mg–1.
Details
- Language :
- English
- ISSN :
- 15306984 and 15306992
- Volume :
- 20
- Issue :
- 9
- Database :
- Supplemental Index
- Journal :
- Nano Letters
- Publication Type :
- Periodical
- Accession number :
- ejs54050576
- Full Text :
- https://doi.org/10.1021/acs.nanolett.0c03088