Performance-Enhancing Asymmetric Separator for Lithium-Sulfur Batteries

被引：58

作者：

Conder, Joanna ^{[1
]}

Forner-Cuenca, Antoni ^{[1
]}

Gubler, Elisabeth Muller ^{[2
]}

Gubler, Lorenz ^{[1
]}

Novak, Petr ^{[1
]}

Trabesinger, Sigita ^{[1
]}

机构：

[1] Paul Scherrer Inst, Electrochem Lab, CH-5232 Villigen, Switzerland

[2] Paul Scherrer Inst, Lab Biomol Res, CH-5232 Villigen, Switzerland

来源：

ACS APPLIED MATERIALS & INTERFACES | 2016年 / 8卷 / 29期

基金：

瑞士国家科学基金会;

关键词：

polysulfide rejection; Li-S battery; separators; polysulfide shuttle control; grafted separators; FUNDAMENTAL CHEMISTRY; POLYSULFIDE SHUTTLE; GRAPHENE OXIDE; TEMPERATURE; COMPOSITES; CATHODE; DROPS; LINO3;

D O I：

10.1021/acsami.6b04662

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：18822 / 18831

页数：10

共 41 条

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