AI Article Synopsis
- The study examines the use of asymmetric separators made from porous polypropylene enhanced with styrenesulfonate (PP-g-PLiSS) in lithium-sulfur cells to evaluate their effectiveness.
- Various tests, including galvanostatic cycling and cyclic voltammetry, were performed to compare the electrochemical performance of these separators against a leading option, Celgard 2400.
- Results indicate that the PP-g-PLiSS separators significantly boost the cell's Coulombic efficiency and effectively suppress polysulfide shuttle while maintaining lithium-ion mobility, thanks to an optimal concentration of Li-exchange sites.
Article Abstract
Asymmetric separators with polysulfide barrier properties consisting of porous polypropylene grafted with styrenesulfonate (PP-g-PLiSS) were characterized in lithium-sulfur cells to assess their practical applicability. Galvanostatic cycling at different C-rates with and without an electrolyte additive and cyclic voltammetry were used to probe the electrochemical performance of the cells with the PP-g-PLiSS separators and to compare it with the performance of the cells utilizing state-of-the-art separator, Celgard 2400. Overall, it was found that regardless of the applied cycling rate, the use of the grafted separators greatly enhances the Coulombic efficiency of the cell. An appropriate Li-exchange-site (-SO3(-)) concentration at and near the surface of the separator was found to be essential to effectively suppress the polysulfide shuttle without sacrificing the Li-ion mobility through the separator and to improve the practical specific charge of the cell.
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| http://dx.doi.org/10.1021/acsami.6b04662 | DOI Listing |
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