Enhancing the Catalytic Activity of Layered Double Hydroxide Supported on Graphene for Lithium–Sulfur Redox Reactions

The lithium–sulfur battery is one of the next-generation rechargeable battery candidates due to its high theoretical energy density and low cost. However, the sluggish conversion kinetics of soluble lithium polysulfides into insoluble Li<sub>2</sub>S<sub>2</sub>/Li<sub>...

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Bibliographic Details
Main Authors: Junjie Xu, Rui Tang, Minghui Liu, Shuai Xie, Dawei Zhang, Xianghua Kong, Song Jin, Hengxing Ji, Tierui Zhang
Format: Article
Language:English
Published: MDPI AG 2022-10-01
Series:Batteries
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Online Access:https://www.mdpi.com/2313-0105/8/11/200
Description
Summary:The lithium–sulfur battery is one of the next-generation rechargeable battery candidates due to its high theoretical energy density and low cost. However, the sluggish conversion kinetics of soluble lithium polysulfides into insoluble Li<sub>2</sub>S<sub>2</sub>/Li<sub>2</sub>S leads to low sulfur utilization, retarded rate responses, and rapid capacity decay. Here, we enhance the sulfur reduction kinetics by designing and synthesizing a lamellar-structured NiFeLDH and reduced graphene oxide (rGO) composite. The assembly of a two-dimensional NiFeLDH with rGO, which has high conductivity and electrocatalytic activity, significantly enhances the electrochemical steps of sulfur reduction. The S@NiFeLDH/rGO cathode delivers an initial discharge capacity of 1014 mAh g<sup>−1</sup> at 0.2 C and a capacity of 930 mAh g<sup>−1</sup> after 100 cycles at 0.2 C. Even at a high current density of 1 C, the S@NiFeLDH/rGO could maintain a high capacity of 554 mAh g<sup>−1</sup> after 400 cycles.
ISSN:2313-0105