Enhancing the Catalytic Activity of Layered Double Hydroxide Supported on Graphene for Lithium–Sulfur Redox Reactions
Junjie Xu,
Rui Tang,
Minghui Liu,
Shuai Xie,
Dawei Zhang,
Xianghua Kong,
Song Jin,
Hengxing Ji,
Tierui Zhang
Affiliations
Junjie Xu
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
Rui Tang
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
Minghui Liu
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
Shuai Xie
National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
Dawei Zhang
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
Xianghua Kong
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
Song Jin
National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
Hengxing Ji
National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
Tierui Zhang
Key Laboratory of Photochemical Conversion and Optoelectronic, Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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 Li2S2/Li2S 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−1 at 0.2 C and a capacity of 930 mAh g−1 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−1 after 400 cycles.
