Efficient polysulfide trapping in lithium–sulfur batteries using ultrathin and flexible BaTiO3/graphene oxide/carbon nanotube layers

Jing Wang; Zhe Shi; Yufeng Luo; Datao Wang; Hengcai Wu; Qunqing Li; Shoushan Fan; Ju Li; Jiaping Wang

doi:10.1039/D0NR08625H

Efficient polysulfide trapping in lithium–sulfur batteries using ultrathin and flexible BaTiO₃/graphene oxide/carbon nanotube layers†

Jing Wang,^a Zhe Shi,^b Yufeng Luo,^a Datao Wang,^a Hengcai Wu,^a Qunqing Li,^ac Shoushan Fan,^ac Ju Li

^b and Jiaping Wang

*^ac

Author affiliations

* Corresponding authors

^a Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China
E-mail: jpwang@tsinghua.edu.cn

^b Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

^c Frontier Science Center for Quantum Information, Beijing 100084, China

Abstract

Ultrathin and flexible layers containing BaTiO₃ (BTO) nanoparticles, graphene oxide (GO) sheets, and carbon nanotube (CNT) films (BTO/GO@CNT) are used to trap solvated polysulfides and alleviate the shuttle effect in lithium–sulfur (Li–S) batteries. In the functional layers, the CNT films build a conductive framework, and the GO sheets form a support membrane for the uniform dispersion of BTO nanoparticles. BTO nanoparticles without ferroelectricity (nfBTO) can trap polysulfides more effectively by chemical interaction compared to BTO nanoparticles with ferroelectricity (fBTO). A Li–S cell with the nfBTO/GO@CNT functional layer exhibits a reversible capacity of 824.5 mA h g⁻¹ over 100 cycles at 0.2 C. At a high sulfur loading of 5.49 mg cm⁻², an electrode with the functional layer shows an areal capacity of 5.15 mA h cm⁻² at 0.1 C, demonstrating the nfBTO/GO@CNT functional layer's potential in developing high-performance Li–S batteries.

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Article information

DOI: https://doi.org/10.1039/D0NR08625H
Article type: Paper
Submitted: 05 Dec 2020
Accepted: 12 Mar 2021
First published: 12 Mar 2021

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Nanoscale, 2021,13, 6863-6870

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Efficient polysulfide trapping in lithium–sulfur batteries using ultrathin and flexible BaTiO₃/graphene oxide/carbon nanotube layers

J. Wang, Z. Shi, Y. Luo, D. Wang, H. Wu, Q. Li, S. Fan, J. Li and J. Wang, Nanoscale, 2021, 13, 6863 DOI: 10.1039/D0NR08625H

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