Journal
MATERIALS HORIZONS
Volume 4, Issue 5, Pages 908-914Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7mh00510e
Keywords
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Funding
- Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy (EERE) [DE-EE0007218]
- Welch Foundation [F-1254]
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The migration of small polysulfide (LiPS) chains through the porous polymeric separators seriously jeopardizes the cycle life and energy density of lithium-sulfur (Li-S) batteries. Herein, we present a new concept in which an organic oligoaniline, amine-capped aniline trimer (ACAT), serves as an effective suppressor of the LiPS migration in Li-S cells. The strong interaction between LiPS and ACAT facilitates the formation of bulky ACAT-LiPS complexes (organoLiPS complexes), which are then size-selectively sieved by the porous polymeric separators employed in Li-S cells. Thus, the addition of ACAT significantly ameliorates the electrochemical performances of Li-S batteries due to suppressed LiPS migration. This new concept offers a viable strategy to achieve practically viable Li-S batteries.
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