1 research outputs found
Performance-Enhancing Asymmetric Separator for LithiumāSulfur Batteries
Asymmetric
separators with polysulfide barrier properties consisting of porous
polypropylene grafted with styrenesulfonate (PP<i>-<i>g</i>-</i>PLiSS) were characterized in lithiumāsulfur 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<i>-<i>g</i>-</i>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
(āSO<sub>3</sub><sup>ā</sup>) 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