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Effective polysulfide rejection by dipole-aligned BaTiO3 coated separator in lithium-sulfur batteries

Cited 92 time in Web of Science Cited 93 time in Scopus
Authors
Yim, Taeeun; Han, Seung Ho; Park, Nam Hwan; Park, Min-Sik; Lee, Ji Hoon; Shin, Jaeho; Choi, Jang Wook; Jung, Yongju; Jo, Yong Nam; Yu, Ji-Sang; Kim, Ki Jae
Issue Date
2016-11
Citation
Advanced Functional Materials, Vol.26 No.43, pp.7817-7823
Abstract
Although the exceptional theoretical specific capacity (1672 mAh g(-1)) of elemental sulfur makes lithium-sulfur (Li-S) batteries attractive for upcoming rechargeable battery applications (e.g., electrical vehicles, drones, unmanned aerial vehicles, etc.), insufficient cycle lives of Li-S cells leave a substantial gap before their wide penetration into commercial markets. Among the key features that affect the cyclability, the shuttling process involving polysulfides (PS) dissolution is most fatal. In an effort to suppress this chronic PS shuttling, herein, a separator coated with poled BaTiO3 or BTO particles is introduced. Permanent dipoles that are formed in the BTO particles upon the application of an electric field can effectively reject PS from passing through the separator via electrostatic repulsion, resulting in significantly improved cyclability, even when a simple mixture of elemental sulfur and conductive carbon is used as a sulfur cathode. The coating of BTO particles also considerably suppresses thermal shrinkage of the poly(ethylene) separator at high temperatures and thus enhances the safety of the cell adopting the given separator. The incorporation of poled particles can be universally applied to a wide range of rechargeable batteries (i.e., metal-air batteries) that suffer from cross-contamination of charged species between both electrodes.
ISSN
1616-301X
URI
http://hdl.handle.net/10371/164721
DOI
https://doi.org/10.1002/adfm.201602498
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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