Immobilizing Polysulfides with MXene-Functionalized Separators for Stable Lithium-Sulfur Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-sulfur (Li-S) batteries are promising for next-generation energy storage.
• Challenges include poor cycling stability and low sulfur utilization.
• Advanced materials are needed to overcome these limitations.

Purpose of the Study:

• To enhance the performance of Li-S batteries.
• To investigate the effect of Ti₃C₂T_x MXene coatings on battery separators.
• To improve specific capacities and cycling stability.

Main Methods:

• Coating Ti₃C₂T_x MXene nanosheets onto commercial Celgard membranes.
• Characterizing the uniform coating layer with minimal mass loading (0.1 mg cm^-2) and thickness (522 nm).
• Evaluating the electrochemical performance of the modified Li-S batteries.

Main Results:

• The Ti₃C₂T_x MXene coating improved electrical conductivity.
• Effective trapping of polysulfides was observed.
• Li-S batteries with MXene-functionalized separators showed superior specific capacities and cycling stability.

Conclusions:

• Ti₃C₂T_x MXene functionalized separators significantly enhance Li-S battery performance.
• The ultrathin 2D structure of MXene is key to uniform coating and improved conductivity.
• This approach offers a viable strategy for practical Li-S battery applications.