A Novel Synthesizing Strategy of 3D Cose2 Porous Hollow Flowers for High Performance Lithium–Sulfur Batteries

Redox kinetics of lithium polysulfides (LiPSs) conversion and poor electrical conductivity of sulfur during the charge-discharge process greatly inhibit the commercialization of high-performance lithium–sulfur (Li–S) batteries. Herein, we synthesized CoSe2 porous hollow flowers (CoSe2-PHF) by etchin...

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Bibliographic Details
Published inCatalysts Vol. 11; no. 2; p. 273
Main Authors Xu, Wei, Wu, Qikai, Che, Zhongmei, Fan, Bin, Zhao, Dengke, Wang, Shuai, Han, Aixia, Li, Ligui
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.02.2021
Subjects
Adsorption
Carbon
catalysis
Catalysts
Catalytic activity
Catalytic converters
Chemical reactions
Coal
Commercialization
Conversion
Decay rate
Discharge
electrical conductivity
Electrical resistivity
Electrodes
Electron transport
Etching
Flowers
Lithium sulfur batteries
Metal compounds
Metal oxides
Rechargeable batteries
Satellites
Selenium
Sulfur
Synthesis
Three dimensional flow
Transition metal compounds
transition metal selenide
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Summary:Redox kinetics of lithium polysulfides (LiPSs) conversion and poor electrical conductivity of sulfur during the charge-discharge process greatly inhibit the commercialization of high-performance lithium–sulfur (Li–S) batteries. Herein, we synthesized CoSe2 porous hollow flowers (CoSe2-PHF) by etching and further selenizing layered double hydroxide, which combined the high catalytic activity of transition metal compound and high electrical conductivity of selenium. The obtained CoSe2-PHF can efficiently accelerate the catalytic conversion of LiPSs, expedite the electron transport, and improve utilization of active sulfur during the charge-discharge process. As a result, with CoSe2-PHF/S-based cathodes, the Li–S batteries exhibited a reversible specific capacity of 955.8 mAh g−1 at 0.1 C and 766.0 mAh g−1 at 0.5 C, along with a relatively small capacity decay rate of 0.070% per cycle within 400 cycles at 1 C. Even at the high rate of 3 C, the specific capacity of 542.9 mAh g−1can be maintained. This work enriches the way to prepare porous composites with high catalytic activity and electrical conductivity as sulfur hosts for high-rate, long-cycle rechargeable Li–S batteries.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal11020273