期刊
NANO LETTERS
卷 20, 期 9, 页码 6922-6929出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03088
关键词
Li-S batteries; Mentbrane; Porous materials; Phase inversion; CeO2
类别
资金
- Natural Science Foundation of China [21676043, 21506028, 21706023]
- Dalian Innovation [2019J125N68]
- China Postdoctoral Science Foundation [2018M631167]
- Changjiang Scholars Program [T2012049]
- Welch Foundation [F-1861]
- Sloan Research Fellowship
The key to realizing practical applications of LiS batteries lies in scalable fabrication of cathode materials with high sulfur-loading and strong binding of lithium polysulfides (LiPSs). We report a scalable CeO2CNT@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 CeOCNT@C membrane can serve as an Al foil-free cathode and an interlayer for LiS batteries. Moreover, CeO2 can immobilize LiPSs and can alleviate its shuttle effect. The LiS batteries with a sulfur loading of 6.2 mg cm(2) deliver a capacity of 847 mA h g(1) after 100 cycles, showing a high areal capacity of 5.25 mA h cm(2) at a low electrolyte/sulfur ratio of 5.2 mu L mg(1).
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