Abstract
The ability to restrict the shuttle of lithium polysulfide (LiPSn) and improve the utilization efficiency of sulfur represents an important endeavor toward practical application of lithium-sulfur (Li-S) batteries. Herein, we report the crafting of a robust 3D graphene-wrapped, nitrogen-doped, highly mesoporous carbon/sulfur (G-NHMC/S) hierarchical aerogel as an effective polysulfide confinement matrix for a highly stable Li-S battery. Rich polar sites of NHMC firmly anchor LiPSn on the matrix surface. Porous NHMC provides ample space for accommodating sulfur and cushioning its volume expansion. Moreover, graphene wrapped on NHMC/S not only physically hinders the LiPSn shuttle but also interconnects the isolated NHMC/S, thus increasing electron transfer rate. Taken together, triple confinement of G-NHMC/S aerogel synergistically retains the soluble LiPSn and displays a specific capacity of 1322 mAh g-1 and 1000-cycle life. As such, rationally designed 3D carbon/sulfur aerogel affords a unique platform to impart high energy density and stable electrodes for energy storage devices.
Original language | English |
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Pages (from-to) | 7662-7669 |
Number of pages | 8 |
Journal | Nano Letters |
Volume | 20 |
Issue number | 10 |
DOIs | |
State | Published - 14 Oct 2020 |
Bibliographical note
Publisher Copyright:Copyright © 2020 American Chemical Society.
Keywords
- DFT calculation
- Hierarchical aerogel
- Lithium-sulfur batteries
- Nitrogen-doped
- Shuttle of lithium polysulfide