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

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

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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