期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 21, 页码 18310-18315出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03290
关键词
polysulfides; shuttle effects; anode protection; polymeric materials; membranes
资金
- 973 Program [2015CB258400]
- Natural Science Foundation of China [51622703]
- Major Project of Technological Innovation in Hubei Province [2016AAA038]
A monolayer poly(vinyl alcohol) (PVA)-based separator with pendant sulfonate/carboxylate groups and compact morphology is synthesized to suppress the essential lithium polysulfide permeation in lithium sulfur batteries (LSBs). The Li+ transference number is significantly increased to 0.8, much higher than that of a commercial separator (0.43). The polysulfide retention is verified by idle test in a polysulfide-rich electrolyte under the internal electric field of the cell. The LSB with an additive-free electrolyte attains a Coulombic efficiency around 98% and delivered capacity of 804 mA h g(-1) at 2.5 A g(-1). After 500 cycles, it retains 901 mA h g(-1) at 1.5 A g(-1) with extra low fading rate of 0.016% per cycle. Overall, this monolayer PVA-based separator provides a facile and effective technique to assemble highly stable LSBs.
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