Indexed by:Journal Article

Date of Publication:2021-02-02

Journal:NANO LETTERS

Volume:20

Issue:9

Page Number:6922-6929

ISSN:1530-6984

Key Words:Li-S batteries; Mentbrane; Porous materials; Phase inversion; CeO2

Abstract: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).