Related Experiment Video
Updated: Jul 6, 2025
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
High-Entropy MXene as Bifunctional Mediator toward Advanced Li-S Full Batteries
Qi Liang1, Sizhe Wang1,2, Xiaomeng Lu3
1School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an 710021, China.
This study introduces a novel high-entropy MXene-doped graphene composite (HE-MXene/G@PP) to solve the polysulfide shuttle effect in lithium-sulfur batteries (LSBs). This mediator enhances LiPSs redox kinetics and promotes stable lithium deposition for improved battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur batteries (LSBs) offer high energy density but are limited by the polysulfide shuttle effect.
- The polysulfide shuttle effect leads to capacity fading and poor cycle life in LSBs.
- Existing solutions often fail to address both polysulfide trapping and uniform lithium deposition.
Purpose of the Study:
- To develop a bifunctional mediator for separator modification in LSBs.
- To mitigate the polysulfide shuttle effect and improve lithium anode stability.
- To enhance the overall performance and cycle life of LSBs.
Main Methods:
- Fabrication of a high-entropy MXene-doped graphene composite (HE-MXene/G@PP).
- Utilized Density Functional Theory (DFT) calculations, in situ Raman spectroscopy, and electrochemical impedance spectroscopy (EIS) for analysis.
- Tested the material's performance in Li||Li symmetric cells and LSBs under various conditions.
Main Results:
- The HE-MXene/G@PP composite demonstrated high electrical conductivity and abundant active sites for efficient polysulfide trapping.
- Synergistic effects of the 'cocktail effect' and lattice distortion promoted rapid LiPSs redox reactions and dendrite-free lithium deposition.
- Achieved excellent long-term cycling stability (0.026%/0.031% decay per cycle after 1200 cycles) and stable Li||Li cell performance for 6000 hours.
Conclusions:
- The HE-MXene/G@PP composite effectively suppresses the polysulfide shuttle effect and promotes uniform lithium deposition.
- This bifunctional mediator strategy offers a promising approach to simultaneously address challenges at the sulfur cathode and lithium anode.
- The developed material significantly enhances the cycle life and stability of high-energy-density lithium-sulfur batteries.
