期刊
ENERGY TECHNOLOGY
卷 9, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.202100418
关键词
electrostatic repulsion; lithium-sulfur batteries; Nafion ionomers; shuttle effect; sulfur electrodes
资金
- National Natural Science Foundation of China [52007054, 51901074, 51907173]
- Natural Science Foundation of Hubei province of China [2020CFB472]
- Research Project of Hubei Provincial Department of Education [B2020131]
- Hubei Normal University [HS2020RC038]
The encapsulated sulfur electrode effectively addresses the shuttle effect of internal polysulfides, improving the cyclic performance of the battery.
Lithium-sulfur batteries are deemed to have the opportunity to replace lithium-ion batteries because of their high energy density. Nonetheless, the shuttling of soluble long-chain polysulfides severely deteriorates the cyclic performances of the batteries. Herein, an encapsulated sulfur electrode to tackle the shuttle effect is designed. This high-performance electrode is fabricated by encapsulating the active sulfur inside a sealing configuration composed of lithiated Nafion (Li-Nafion), carbon black (BP2000), and a binder of polytetrafluoroethylene. The dense surface of the encapsulated configuration can physically obstruct the mobility of soluble polysulfides. Meanwhile, the sulfonic acid groups fixed on the Li-Nafion backbone provide a robust electrostatic repulsion to inhibit the negatively charged polysulfides from migrating into the electrolyte. Therefore, the encapsulated sulfur electrode delivers 522.6 mAh g(-1) at the 600th cycle with a retention of 80.36%, exhibiting a more competitive cyclic stability than the pristine sulfur electrode.
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