期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 10, 期 18, 页码 6117-6127出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.2c01883
关键词
Li-S batteries; Host materials; Shuttle effect; Wire in tube; Hollow structure; Electrospinning
资金
- National Natural Science Foundation of China [51872210, 52104309]
- Program of Hubei Province [T201602]
- Youth Fund of State Key Laboratory of Refractory and Metallurgy of Wuhan University of Science and Technology [014QN02]
- Hubei Natural Science Foundation [2021CFB011]
- Macao Young Scholars Program, China [AM2020004]
By designing various sulfur host materials, the unique structure of the WIT-Co/S cathode demonstrates excellent cycling performance and capacity, providing a new idea for the practical application of Li-S batteries.
The various designs of sulfur host materials for thelithium-sulfur (Li-S) battery have attracted ever-increasinginterest in alleviating the fatal shuttle effect of lithium polysulfide(LiPS) intermediates. Designing host materials for sulfur cathodesneeds particular attention in both physical confinement and surfacechemistry. Herein, the Co, N codopedwire in tubecarbonfiber(WIT-Co) is rationally fabricated and serves as the sulfur host.Benefiting from the synergistic effects of excellent LiPS absorptionand electrocatalysis capability, the WIT-Co/S cathode reveals ahigh initial capacity of 1462 mAh g-1at 0.1 C and stable cyclingperformance of 650 mAh g-1at 2.0 C after 400 cycles with a low-capacity decay of 0.021% per cycle. Notably, even with the highsulfur loading of 5.6 mg cm-2and low electrolyte/sulfur ratio of 5 mu Lmg-1, the WIT-Co/S electrode still exhibits an excellent arealcapacity of 4.8 mAh cm-2at 0.2 C after 100 cycles. This work provides a superior structure of the sulfur host, which not onlyaccelerates the conversion of LiPSs but also alleviates the shuttle effect, therefore facilitating the practical application of Li-Sbatteries.
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