Elevating Lithium-Sulfur Battery Durability through Samarium Oxide/Ketjen Black Modified Separator

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-sulfur (Li-S) batteries offer high energy density but face challenges like slow kinetics and polysulfide shuttle.
• Effective strategies are needed to overcome these limitations for practical Li-S battery applications.

Purpose of the Study:

• To develop a novel material that enhances the electrochemical performance of Li-S batteries.
• To address the issues of slow reaction kinetics and the shuttle effect in Li-S systems.

Main Methods:

• Synthesized a porous carbon nanostructure modified with samarium oxide (Sm2O3/KB).
• Investigated the material's surface polarity, oxygen vacancies, and porous structure.
• Fabricated and tested Li-S batteries utilizing Sm2O3/KB/PP spacers.

Main Results:

• Sm2O3/KB exhibits a highly polar surface for efficient lithium polysulfide chemisorption.
• Oxygen vacancies in Sm2O3 facilitate Li2S nucleation and accelerate Li2S dissolution.
• Porous Ketjen Black provides conductivity and traps polysulfides.
• Batteries demonstrated a low capacity decay rate (0.046% over 1000 cycles at 2C) and high rate performance (624 mAh/g at 3C).

Conclusions:

• The novel Sm2O3/KB material significantly improves Li-S battery performance.
• Rare-earth-based materials show potential for advanced Li-S battery development.
• This approach offers a promising strategy for next-generation energy storage solutions.