C@MoS₂ modified separator as efficient trapper and catalysis for promoting polysulfide conversion in Li-S battery

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Traditional polypropylene separators in lithium-sulfur (Li-S) batteries fail to prevent the polysulfide shuttle effect.
• These separators also exhibit poor safety at elevated temperatures, hindering Li-S battery applications.

Purpose of the Study:

• To develop a novel modified separator for Li-S batteries to overcome the limitations of traditional separators.
• To enhance the electrochemical performance and safety of Li-S batteries.

Main Methods:

• Layered hierarchical C@MoS2 spheres were synthesized.
• The synthesized C@MoS2 spheres were used to modify traditional separators.

Main Results:

• The modified separator effectively inhibited the polysulfide shuttle effect.
• Li-S batteries utilizing the C@MoS2 separator demonstrated high specific capacity and superior cycling stability, even at a high rate of 2C.
• The enhanced performance is attributed to the adsorption and catalytic conversion of polysulfides by the C@MoS2 material.

Conclusions:

• The C@MoS2 modified separator offers a promising solution for improving Li-S battery performance and safety.
• This work provides valuable insights for the future large-scale application of Li-S batteries.