화학공학소재연구정보센터
Electrochimica Acta, Vol.210, 71-78, 2016
High capacity and cycle stability Rechargeable Lithium-Sulfur batteries by sandwiched gel polymer electrolyte
A novel sandwiched gel polymer electrolyte (GPE) was prepared using a facile method as separator solely for rechargeable Lithium-Sulfur batteries. As a result of the strong physical shielding and chemical absorption of GPE, the separator can not only suppress shuttle effect in ether-based electrolyte, but also improve utilization of sulfur significantly resulting in a high capacity. The PVDF layers could absorb ether based electrolyte largely and then enhance Li+ transfer; the PMMA layer can be utilized to trap the dissolved polysulfides. Lithium-Sulfur batteries with the sandwiched GPE separator shows an encouraging electrochemical performance. A high initial discharge capacity of 1711.8 mAh g (1) is obtained, and the capacity retains at 1145.3 mAh g (1) after 50 cycles at 200 mAg (1), which is higher than that of the cell with the commercial separator. These results indicate that the appropriate GPE separator is more suitable in Lithium-Sulfur batteries applications. (C) 2016 Published by Elsevier Ltd.