Abstract
? 2022 Elsevier B.V.Lithium–sulfur (Li–S) batteries are expected to become efficient new-generation energy storage systems owing to their properties such as high theoretical specific capacity (1675 mAh g?1) and high energy density (2600 Wh kg?1). However, some factors restrict their rapid development; for example, the dissolution and migration of polysulfides during the charge and discharge process, extremely poor conductivity of sulfur, and increase in volume. A glass fiber separator with graphene was loaded on a surface modified by excimer ultraviolet light (EUV/graphene separator) as the separator for Li–S batteries. The modified separator was irradiated by excimer ultraviolet light with graphene powder loaded on a glass fiber via vacuum filtration; this can effectively block polysulfide diffusion and improve the utilization rate of active materials when assembled into a Li–S battery. The first discharge specific capacity for this separator was as high as 1164 mAh g?1 at 0.2 C; after 300 cycles, the specific capacity was maintained at 640.5 mAh g?1. This modified separator guarantees the efficient migration of lithium ions and effectively inhibits the shuttle effect of Li–S batteries.
NSTL
Elsevier