BiFeO 3 Coupled Polysulfide Trapping in C/S Composite Cathode Material for Li-S Batteries as Large Efficiency and High Rate Performance

Balram Tripathi, Rajesh K. Katiyar, Gerardo Morell, Ambesh Dixit and Ram S. Katiyar
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Balram Tripathi: Department of Physics, University of Puerto Rico, San Juan, PR 00936, USA
Rajesh K. Katiyar: Department of Physics, University of Puerto Rico, San Juan, PR 00936, USA
Gerardo Morell: Department of Physics, University of Puerto Rico, San Juan, PR 00936, USA
Ambesh Dixit: Department of Physics, Indian Institute of Technology, Jodhpur 342037, India
Ram S. Katiyar: Department of Physics, University of Puerto Rico, San Juan, PR 00936, USA

Energies, 2021, vol. 14, issue 24, 1-9

Abstract: We demonstrated the efficient coupling of BiFeO 3 (BFO) ferroelectric material within the carbon–sulfur (C-S) composite cathode, where polysulfides are trapped in BFO mesh, reducing the polysulfide shuttle impact, and thus resulting in an improved cyclic performance and an increase in capacity in Li-S batteries. Here, the built-in internal field due to BFO enhances polysulfide trapping. The observation of a difference in the diffusion behavior of polysulfides in BFO-coupled composites suggests more efficient trapping in BFO-modified C-S electrodes compared to pristine C-S composite cathodes. The X-ray diffraction results of BFO–C-S composite cathodes show an orthorhombic structure, while Raman spectra substantiate efficient coupling of BFO in C-S composites, in agreement with SEM images, showing the interconnected network of submicron-size sulfur composites. Two plateaus were observed at 1.75 V and 2.1 V in the charge/discharge characteristics of BFO–C-S composite cathodes. The observed capacity of ~1600 mAh g −1 in a 1.5–2.5 V operating window for BFO 30 -C 10 -S 60 composite cathodes, and the high cyclic stability substantiate the superior performance of the designed cathode materials due to the efficient reduction in the polysulfide shuttle effect in these composite cathodes.

Keywords: Li-S battery; C/S composite; BFO coupling; polysulfide trapping (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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