Journal
NANO ENERGY
Volume 86, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106120
Keywords
MXene (Ti3C2Tx); Hierarchical structure; Li-S batteries; High volumetric capacity; Reaction mechanism
Categories
Funding
- Natural Science Foundation of Jiangsu Province [BK20190688]
- Postdoctoral Reserch Foundation of China [2019M651815]
- King Abdullah University of Science and Technology (KAUST)
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This study explores the use of MXene as a new host material to improve the electrochemical performance of Li-S batteries, successfully increasing the volumetric energy density of the batteries. Experimental results show that Ti-OH bonds in the MXene membrane effectively trigger the transformation of LiPS, and the stable charge product alpha-S-8 plays a potential important role in reducing active mass loss and enhancing cycling capability in the battery.
Due to the low density of sulfur and the large portion of carbon-based materials used as conducting network and lithium polysulfide (LiPS) host, the practical volumetric energy density of lithium-sulfur (Li-S) batteries barely rivals the Li-ion batteries. Here, MXene (Ti3C2Tx)-based membrane with unique 3D hierarchical structure, high electronic conductivity, abundent active binding sites, fast ion transport, and high affinity for lithium polysulfides has been developed as a new host material to improve the electrochemical performance of Li-S batteries. With a density of 2.2 g cm(-3), a MXene-based cathode containing 4.0 mg cm(-2) sulfur delivers a high volumetric capacity of 2.7 Ah cm(-3) after 200 cycles. Based on operando XRD and ex-situ XPS results, we find that the Ti-OH bonds present on the surface of MXene membrane can effectively trigger the LiPS transformation. Furthermore, alpha-S-8, as the stable charge product, is first reported in MXene-based host along with its possible important role in curtailing active mass loss and enhancing cycling capability. Our results reveal that 2D MXene with rationally-designed architecture enable high volumetric capacity Li-S batteries for practical applications.
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