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Self-assembled CdS Quantum Dots in Carbon Nanotubes-Induced Polysulfide Trapping and Redox Kinetics Enhancing for Lithium-Sulfur Battery Performance Improvement

Abstract

Lithium-sulfur batteries appear to hold promise as the next-generation energy storage systems due to their five times higher theoretical energy density than commercial Li ion batteries. However, the insulation nature of sulfur/lithium sulfides and severe polysulfide shuttle reaction between Li anode and sulfur cathode hinder their practical applications. Herein, we demonstrate the rational design to construct a CdS quantum dots uniformly attached to carbon nanotubes architecture for sulfur infiltration which was used as a high-performance sulfur cathode in lithium-sulfur batteries. This special architecture exhibits high polysulfide adsorption and confinement while allowing fast electron and Li ion transfer. In addition, the synergic catalytic of cadmium and the introduced heteroatoms are favor to enhance the reaction kinetics. As a result, this carbon nanotubes/CdS quantum dots/S composite greatly improves the rate and cycle performance of lithium-sulfur batteries. The specific capacity decreases slowly from 1237.8 mAh g-1 at 0.2 C to 918.1 mAh g-1 at 2.0 C, showing an excellent rate performance and a good capacity retention of 820.6 mAh g-1 at 0.5 C for over 150 cycles with coulombic efficiency of over 98.0%. The employ of the CdS quantum dots suppresses the shuttle effect and enhances the redox kinetics, thereby leading to a high utilization of sulfur, and thus provides new avenues for the design of advanced cathode materials for high-performance lithium-sulfur batteries.

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Publication details

The article was received on 14 Oct 2018, accepted on 30 Nov 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA09906E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Self-assembled CdS Quantum Dots in Carbon Nanotubes-Induced Polysulfide Trapping and Redox Kinetics Enhancing for Lithium-Sulfur Battery Performance Improvement

    D. Cai, L. Wang, L. Li, Y. Zhang, J. Li, D. Chen, H. Tu and W. Han, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA09906E

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