Hierarchically Structured Ti3C2T MXene Paper for Li-S Batteries with High Volumetric Capacity

Wenli zhao, Yongjiu Lei, Yunpei Zhu, Qian Wang, Fan Zhang, Xiaochen Dong, Husam N. Alshareef

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

Due to the Low density of sulfur as well as 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 ability, 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, α-S8, 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.
Original languageEnglish (US)
Pages (from-to)106120
JournalNano Energy
DOIs
StatePublished - May 2 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-05-07
Acknowledgements: This work is financially supported by the Natural Science Foundation of Jiangsu Province (BK20190688), Postdoctoral Reserch Foundation of China (2019M651815), and King Abdullah University of Science and Technology (KAUST).

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering

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