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Defect engineering of black phosphorene towards an enhanced polysulfide host and catalyst for lithium-sulfur batteries: A first principles study.
- Source :
- Journal of Applied Physics; 2019, Vol. 125 Issue 9, pN.PAG-N.PAG, 10p, 4 Diagrams, 2 Charts, 5 Graphs
- Publication Year :
- 2019
-
Abstract
- Although lithium-sulfur (Li-S) batteries are widely regarded as one of the most promising next-generation high energy density storage systems, their large-scale applications are seriously impeded by rapid capacity fading and poor Coulombic efficiency owing to the shuttling of lithium polysulfides (LiPSs) and irreversible discharge product Li<subscript>2</subscript>S. Here, by means of first principles calculations, we studied defective black phosphorene (BP) as a host material to realize high-performance Li-S batteries, including Stone Wales [SW(55-77)], single, and double vacancy [SV(5-9) and DV(5-9-5)] defects. Our results demonstrate that while BP has moderate adsorption energies towards LiPSs, the presence of defects could enhance the adsorption strength between LiPSs and BP because of increased charge transfer. Particularly, defective BP could strike a good balance between adsorption energy and integrity of LiPSs, which is beneficial to prevent the shuttling of LiPSs. Moreover, during the lithiation process, defective BP not only has narrow bandgaps but also decreases the dissociation energy of Li<subscript>2</subscript>S, facilitating the catalytic oxidation of Li<subscript>2</subscript>S back to sulfur. Therefore, it is highly desirable to fabricate defective BP to improve the reversible capacity and cycle stability of Li-S batteries. [ABSTRACT FROM AUTHOR]
- Subjects :
- LITHIUM sulfur batteries
PHOSPHORENE
POLYSULFIDES
ENERGY density
ENERGY storage
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 125
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 135186872
- Full Text :
- https://doi.org/10.1063/1.5082782