CARBON NANOTUBES ASSEMBLED ON POROUS TIO2 MATRIX DOPED WITH CO3O4 AS SULFUR HOST FOR LITHIUM–SULFUR BATTERIES
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Date
2020-11-24
Authors
Qiu, Weilong
Li, Jing
Zhang, Yongguang
Kalimuldina, Gulnur
Bakenov, Zhumabay
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Abstract
Advanced design and fabrication of high performance sulfur cathodes with improved
conductivity and chemical adsorption towards lithium polysulfides (LiPS) are crucial for further
development of Li–S batteries. Hence, we designed a TiO2/Co3O4-CNTs composite derived
from Ti-MOF (MIL-125) as the host matrix for sulfur cathode. The polar nature of metal oxides
(TiO2, Co3O4) creates the adsorptive sites in the composite and leads to an efficient chemical
capture of LiPS. The CNTs ensure the contact between S/Li2S and the host material with high
conductivity, enhanced charge transfer and fast electrochemical kinetics. At the same time, the
CNTs strengthen the stability of the electrode material. Consequently, the as-prepared
TiO2/Co3O4-CNTs composite showed excellent electrochemical performance. The cell with
S–TiO2/Co3O4-CNTs delivers an initial specific capacity of 1270 mAh g–1 at 0.2 C and high rate
performance with a capacity of 603 mAh g–1 at 3 C.
Description
Keywords
porous carbon matrix, lithium–sulfur battery, polysulfides shuttle effect, low-cost and facile synthesis, titanium metal-organic framework, Research Subject Categories::TECHNOLOGY
Citation
Qiu, W., Li, J., Zhang, Y., Kalimuldina, G., & Bakenov, Z. (2020). Carbon nanotubes assembled on porous TiO2 matrix doped with Co3O4 as sulfur host for lithium–sulfur batteries. Nanotechnology, 32(7), 075403. https://doi.org/10.1088/1361-6528/abc451