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Boosting sulfur redox kinetics by a pentacenetetrone redox mediator for high-energy-density lithium-sulfur batteries.
- Source :
- Nano Research; Jun2023, Vol. 16 Issue 6, p8253-8259, 7p
- Publication Year :
- 2023
-
Abstract
- Lithium-sulfur (Li-S) battery is considered as a promising energy storage system due to its ultrahigh theoretical energy density of 2,600 Wh·kg<superscript>−1</superscript>. Redox mediation strategies have been proposed to promote the sluggish sulfur redox kinetics. Nevertheless, the applicability of redox mediators in practical high-energy-density Li-S batteries has seldomly been manifested. In this work, 5,7,12,14-pentacenetetrone (PT) is proposed as an effective redox mediator to promote the sulfur redox kinetics under practical working conditions. A high initial specific discharge capacity of 993 mAh·g<superscript>−1</superscript> is achieved at 0.1 C with high-sulfur-loading cathodes of 4.0 mg<subscript>S</subscript>·cm<superscript>−2</superscript> and low electrolyte/sulfur (E/S) ratio of 5 µL·mg<subscript>S</subscript><superscript>−1</superscript>. More importantly, practical Li-S pouch cells with the PT mediator realize an actual initial energy density of 344 Wh·kg<superscript>−1</superscript> and cycle stably for 20 cycles wih a high capacity retention of 88%. This work proposes an effective redox mediator and further verifies the redox mediation strategy for practical high-energy-density Li-S batteries. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 16
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 164579437
- Full Text :
- https://doi.org/10.1007/s12274-022-4584-z