High‐Performance Lithium‐Sulfur Batteries: Medium‐Entropy Alloys Embedded in CeO <sub>2</sub> for Polysulfide/Sulfide Bidirectional Catalysis
Abstract
Abstract The slow kinetics of the sulfur reduction reaction (SRR) and Li 2 S oxidation reaction (SOR) in lithium‐sulfur batteries (LSBs) seriously affect their practical applications. Herein, we prepared a functional interlayer for LSBs consisting of hydroxylated carbon nanotubes dispersed with NiCoMoIr medium‐entropy alloys embedded in CeO 2 surface materials. Experimental results revealed a bidirectional catalytic mechanism involving different elements, verifying that Ir and Ni promote the SRR of Li 2 S 6 to Li 2 S. Meanwhile, Co and Mo were found to primarily promote the conversion process of Li 2 S to Li 2 S 6 . CeO 2 exhibits a bidirectional synergistic effect on enhancing the kinetics of the SRR and SOR. The battery exhibits a specific capacity of 1535.7 mAh g −1 at 0.2 C, and the decay rate is only 0.051% for per‐cycle of 1000 cycles at 1 C. More importantly, a 2 Ah‐level pouch cell with an energy density of 436.4 Wh kg −1 and the capacity decay rate was 0.039% per‐cycle after 800 cycles.
Article Details
Authors (10)
Chuanhuang Wu
College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China
Yong‐Peng Wang
Key Laboratory of Wind and Solar Energy Utilization Technology of Ministry of Education Inner Mongolia Key Laboratory of New Energy and Energy Storage Technology Inner Mongolia University Renewable Energy Engineering Research Center, School of Energy and Power Engineering Inner Mongolia University of Technology Hohhot 010051 China
Yuchuan Zhu
College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China
Haili Luo
College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China
Longyang Zhou
College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China
Daying Guo
College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China
Guoyong Fang
College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China
Huile Jin
Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering
Xi'an Chen
College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China
Shun Wang
Department of Mathematics