Three-dimensional architectures based on carbon nanotube bridged Ti2C MXene nanosheets for Li

Gu, Q., Lu, M., Chen, J., Qi, Y., & Zhang, B. (2021). Three-dimensional architectures based on carbon nanotube bridged Ti2C MXene nanosheets for Li–S batteries. Particuology, 57, 139-145. https://doi.org/10.1016/j.partic.2021.01.003

Three-dimensional architectures based on carbon nanotube bridged Ti₂C MXene nanosheets for Li–S batteries

Qinhua Gu ^{a b}, Ming Lu ^{a c}, Junnan Chen ^{a b}, Yujie Qi ^{a b}, Bingsen Zhang ^{a b *}

a Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
b School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
c Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China

10.1016/j.partic.2021.01.003

Volume 57, August 2021, Pages 139-145

Received 4 December 2020, Revised 14 January 2021, Accepted 14 January 2021, Available online 4 February 2021, Version of Record 26 February 2021.

E-mail: bszhang@imr.ac.cn

Highlights

• 3D architecture prevents stacking of MXene nanosheets and provides a large interspace.

• Ti atoms absorb polysulfides, suppressing the shuttle effect through chemical adsorption.

• Ti₂C/CNT hybrids modulated electrochemical kinetics of polysulfide conversion.

Abstract

Lithium–sulfur (Li–S) batteries are promising candidates for high density electrochemical energy storage systems. However, the poor conductivity of S and the shuttle effect of polysulfides are a bottleneck to practical applications. Herein, a three-dimensional architecture, based on carbon nanotube (CNT) bridged Ti₂C MXene nanosheets, was constructed as a sulfur host. This architecture was based on Ti atoms, which can chemically absorb polysulfides. The CNTs are highly conductive and intercalate into the MXene nanosheets to prevent their stacking and construct an interspace for polysulfides. This hybrid, as a host of S, can effectively alleviate the shuttle effect through a combination of physical confinement and chemical adsorption. This resulted in an open internal space, which served as a cathode for the loaded S to promote electron transport and enhance electrochemical kinetics of the polysulfide conversion in Li–S batteries.

Graphical abstract

Keywords

Li–S batteries; Shuttle effect; MXene; Polysulfides; Three-dimensional (3D) architecture

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