InOOH as an efficient bidirectional catalyst for accelerated polysulfides conversion to enable high-performance...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-sulfur (Li-S) batteries offer high energy density but face challenges.
• The shuttle effect and slow redox kinetics of polysulfides hinder practical application.

Purpose of the Study:

• To introduce InOOH nanoparticles as a catalytic additive in Li-S battery electrodes.
• To investigate the mechanism of InOOH in mitigating polysulfide issues.

Main Methods:

• Theoretical calculations and experimental validation.
• Incorporation of InOOH nanoparticles into sulfur electrodes.
• Electrochemical performance testing under various conditions.

Main Results:

• InOOH nanoparticles effectively adsorb polysulfides due to strong interactions.
• Demonstrated bidirectional catalytic effects, accelerating both sulfur reduction and Li2S oxidation.
• Achieved 69.5% capacity retention over 500 cycles at 2C and 891 mAh g-1 at high sulfur loading (5.0 mg cm-2).

Conclusions:

• InOOH nanoparticles serve as potent bidirectional catalysts for Li-S batteries.
• This approach effectively addresses the shuttle effect and enhances redox kinetics.
• Provides a novel strategy for developing high-performance Li-S energy storage systems.