Synthesis of nitrogen-doped oxygen-deficient TiO2-x/reduced graphene oxide/sulfur microspheres via spray drying process for lithium-sulfur batteries

Guifeng Chen, Junhua Li, Ning Liu, Yan Zhao, Junguang Tao, Gulnur Kalimuldina, Zhumabay Bakenov, Yongguang Zhang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Improving sulfur redox kinetics and cycling stability of lithium-sulfur (Li-S) batteries through controlling inherent dissolution of polysulfides and following shuttle effect is pivotal for further progress of this promising electrochemical system. In this work, three-dimensional porous microspheres composed of nanosized sulfur particles, nitrogen-doped oxygen-deficient TiO2-x nanorods and reduced graphene oxide (N-TiO2-x/RGO/S) were synthesized as sulfur host material for the first time in spray-drying process. The microspheres construction with void spaces mitigated volumetric expansion upon charge/discharge cycling and improved sulfur utilization. Furthermore, the N-TiO2-x nanorods enhanced the conductivity of the material and exhibited strong capability for adsorption and the migration of lithium polysulfides, which was demonstrated by the density functional theory (DFT) calculations. Due to such advantages, the N-TiO2-x/RGO/S cathode delivered excellent rate capability and stable cycle performance at 1.0 C over 300 cycles with a specific capacity about 700 mAh g−1. This novel design and preparation strategy also contributes to the materials engineering and structural design towards remarkable improvement of electrochemical performance of energy storage systems.

Original languageEnglish
Article number134968
JournalElectrochimica Acta
Volume326
DOIs
Publication statusPublished - Dec 5 2019

Keywords

  • Lithium-sulfur batteries
  • Nitrogen doped TiO
  • Oxygen-deficient TiO
  • Reduced graphene oxide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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