| Autor: |
Zhang, Sibo, Ge, Jiaxin, Lang, Xiaoshi, Lu, Lujia, Wang, Tan, Qu, Tingting, Lai, Qinzhi, Li, Lan, Yao, Chuangang, Cai, Kedi |
| Zdroj: |
Jouranl of Energy Storage; 20240101, Issue: Preprints |
| Abstrakt: |
Lithium-sulfur (LiS) batteries are promising cost-effective energy-storage devices with high energy densities. However, their performance and stability are limited by the poor conductivities of sulfur and lithium polysulfides (LiPSs), and LiPSs shuttling. In this study, we design a novel oxygen-vacancy-containing TiO1.75/Cu(2,4-PDCA)2heterostructure with a dynamic diffusion interface, resulting in the bidirectional catalytic conversion of LiPSs. The oxygen-vacancy-containing TiO1.75designed in this study rapidly captures soluble LiPSs through strong adsorption, and the TiO1.75/Cu(2,4-PDCA)2heterostructure, as a dynamic diffusion interface, facilitates the directed transfer of LiPSs towards Cu(2,4-PDCA)2via bidirectional catalytic conversion involving the transformation of LiPSs in order to prevent its accumulation, which enhances sulfur utilization and realizes adsorption-to-conversion regulation. Electrochemical experiments demonstrate that the TiO1.75/Cu(2,4-PDCA)2/S cathode has the low charge-transfer resistance (22.3 Ω), high initial discharge capacity (1606 mAh·g−1at 0.1C), excellent rate performance (848 mAh·g−1at 2.0C), and good cycling stability (800 cycles at 1C). |
| Databáze: |
Supplemental Index |
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