Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 903, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.163932
Keywords
Lithium-sulfur batteries; Graphene separator; Excimer ultraviolet irradiation
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Funding
- Fundamental Research Funds of Zhejiang Sci-Tech University [2020Y001]
- Zhejiang Provincial Natural Science Foundation of China [LY21E030023, LY17E030008, LY12E03005]
- Fundamental Research Funds of Shaoxing Keqiao Research Institute of Zhejiang Sci-Tech University [KYY2021006Y]
- Suzhou Shi Yuanfan Dianqi Co., LTD [17010291-J]
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By combining a glass fiber separator modified with excimer ultraviolet light with graphene, polysulfide diffusion can be effectively blocked and the utilization rate of active materials can be improved.
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. (C) 2022 Elsevier B.V. All rights reserved.
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