Study of CNTs-MoS2/CeO2 composites for lithium-sulfur battery performance

In recent years, lithium-sulfur batteries have received a lot of attention because of their high energy density (2600 Wh kg −1 ) and theoretical specific capacity (1675 mAh g −1 ), but they also suffer from poor electrical conductivity of S and its final products Li 2 S (the room temperature electro...

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Bibliographic Details
Published in:Ionics 2022-06, Vol.28 (6), p.2781-2791
Main Authors: Feng, Wangjun, Yang, Haijiang, Pu, Zhongsheng, Zhang, Li
Format: Article
Language:English
Subjects:
Carbon nanotubes
Cerium oxides
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Current density
Discharge
Electrical resistivity
Electrochemical analysis
Electrochemistry
Energy Storage
Lithium
Lithium sulfur batteries
Molybdenum disulfide
Nanocomposites
Nanomaterials
Optical and Electronic Materials
Original Paper
Polysulfides
Renewable and Green Energy
Room temperature
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Summary:In recent years, lithium-sulfur batteries have received a lot of attention because of their high energy density (2600 Wh kg −1 ) and theoretical specific capacity (1675 mAh g −1 ), but they also suffer from poor electrical conductivity of S and its final products Li 2 S (the room temperature electronic conductivity is 5 × 10 −30 S cm −1 and 3.6 × 10 −7 S cm −1 , respectively), volume expansion of the sulfur cathode during the reaction, and the “shuttle effect” of the polysulfide generated by the reaction in the electrolyte need to be solved. In order to solve the above problems, this paper has successfully compounded carbon nanotubes (CNTs) with molybdenum disulfide (MoS 2 ) and cerium dioxide (CeO 2 ) nanomaterials by a simple hydrothermal method to prepare CNTs-MoS 2 /CeO 2 nanocomposites, in which MoS 2 catalyzes the conversion of long-chain polysulfides to short-chain polysulfides, and CeO 2 can adsorb polysulfides and inhibit their dissolution, thus alleviating the “shuttle effect.” The experimental results show that the composites have excellent electrochemical performance, with a discharge capacity of 1373.4 mAh g −1 in the first cycle at a current density of 0.1 C, and a discharge capacity of 933.9 mAh g −1 after 200 cycles at a current density of 0.2 C. The Coulomb efficiency can reach over 99%.
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-022-04535-1