Cobalt-doped oxygen-deficient titanium dioxide coated by carbon layer as high-performance sulfur host for Li/S batteries

Tian Y. Zhang X. Zhang Y. Li J. Jia A. Liu G. Bakenov Z.
25 April 2021 Elsevier Ltd

Journal of Alloys and Compounds
2021 #861

The severe shuttle effect and sluggish conversion kinetics of lithium polysulfides impede the commercialization of lithium/sulfur (Li/S) batteries. To address this issue, a composite consists of Co-doped oxygen-deficient TiO₂ coated by carbon layer (Co/TiO_2-x@carbon) is proposed as a high-performance sulfur host. It was fabricated by one-step hydrothermal synthesis, follow by chemical vapor deposition method. The oxygen defects on the surface of Co/TiO_2-x@carbon enhanced its electrical conductivity and strengthened the chemical interactions with polysulfides toward superior sulfur confinement. Moreover, the carbon coating layer has a hollow spherical architecture that can accelerate electron or ion transportation. Additionally, the Co nanoparticles promote sulfur redox conversion. Benefiting from these synergistic features, the S/Co/TiO_2-x@carbon electrode delivers outstanding cycling stability (the capacity decay rate of 0.044% per cycle after 500 cycles) and a superior rate performance (972 mAh g⁻¹ at 2.0C).

Co-doped , Lithium/sulfur batteries , Oxygen vacancy , Titanium dioxide

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School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China
Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, China
Institute of Batteries LLC, Department of Chemical and Materials Engineering, National Laboratory Astana, Nazarbayev University, 53 Kabanbay Batyr Avenue, Nur-Sultan, 010000, Kazakhstan

School of Materials Science and Engineering
Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving
Institute of Batteries LLC

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