Tailoring polysulfide trapping and kinetics by engineering hollow carbon bubble nanoreactors for high-energy Li-S pouch cells

Autor: Xin Li, Jin Hu, Xiaobin Hong, Shuangke Liu, Huigao Duan, Lei Wang, Guanhua Zhang, Xianan Zhang, Chunman Zheng, Yujie Li
Rok vydání: 2021
Předmět:
Zdroj: Nano Research. 14:1355-1363
ISSN: 1998-0000
1998-0124
DOI: 10.1007/s12274-020-3181-2
Popis: Despite great progress of lithium-sulfur (Li-S) battery performance at the laboratory-level, both key parameters and challenges at cell scales to achieve practical high energy density require high-sulfur-loading cathodes and lean electrolytes. Herein, a novel carbon foam integrated by hollow carbon bubble nanoreactors with ultrahigh pore volume of 6.9 cm3·g−1 is meticulously designed for ultrahigh sulfur content up to 96 wt.%. Tailoring polysulfide trapping and ion/electron transport kinetics during the charge-discharge process can be achieved by adjusting the wall thickness of hollow carbon bubbles. And a further in-depth understanding of electrochemical reaction mechanism for the cathode is impelled by the in-situ Raman spectroscopy. As a result, the as-prepared cathode delivers high specific capacitances of 1,269 and 695 mAh·g−1 at 0.1 and 5 C, respectively. Furthermore, Li-S pouch cells with high areal sulfur loading of 6.9 mg·cm−2 yield exceptional practical energy density of 382 Wh·kg−1 under lean electrolyte of 3.5 µL·mg−1, which demonstrates the great potential for realistic high-energy Li-S batteries.
Databáze: OpenAIRE
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