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Promoting Reversible Redox Kinetics by Separator Architectures Based on CoS 2 /HPGC Interlayer as Efficient Polysulfide-Trapping Shield for Li-S Batteries.
- Source :
-
Small (Weinheim an der Bergstrasse, Germany) [Small] 2020 Aug; Vol. 16 (34), pp. e2002046. Date of Electronic Publication: 2020 Jul 22. - Publication Year :
- 2020
-
Abstract
- Main obstacles from the shuttle effect and slow conversion rate of soluble polysulfide compromise the sulfur utilization and cycling life for lithium sulfur (Li-S) batteries. In pursuit of a practically viable high performance Li-S battery, a separator configuration (CoS <subscript>2</subscript> /HPGC/interlayer) as efficient polysulfide trapping barrier is reported. This configuration endows great advantages, particularly enhanced conductivity, promoted polysulfide trapping capability, accelerated sulfur electrochemistry, when using the functional interlayer for Li-S cells. Attributed to the above merits, such cell shows excellent cyclability, with a capacity of 846 mAh g <superscript>-1</superscript> after 250 cycles corresponding to a high capacity retention of 80.2% at 0.2 C, and 519 mAh g <superscript>-1</superscript> after 500 cycles at 1C (1C = 1675 mA g <superscript>-1</superscript> ). In addition, the optimized separator exhibits a high initial areal capacity of 4.293 mAh cm <superscript>-2</superscript> at 0.1C. Moreover, with CoS <subscript>2</subscript> /HPGC/interlayer, the sulfur cell enables a low self-discharge rate with a very high capacity retention of 97.1%. This work presents a structural engineering of the separator toward suppressing the dissolution of soluble Li <subscript>2</subscript> Sn moieties and simultaneously promoting the sulfur conversion kinetics, thus achieving durable and high capacity Li-S batteries.<br /> (© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1613-6829
- Volume :
- 16
- Issue :
- 34
- Database :
- MEDLINE
- Journal :
- Small (Weinheim an der Bergstrasse, Germany)
- Publication Type :
- Academic Journal
- Accession number :
- 32697433
- Full Text :
- https://doi.org/10.1002/smll.202002046