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Multifunctional α-MoO3 Nanobelt Interlayer with the Capacity Compensation Effect for High-Energy Lithium-Sulfur
Xin-Yang Yue1,2, Jing Zhang3, Dong Chen2
1Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
ACS Applied Materials & Interfaces
|February 28, 2023
Summary
A novel freestanding interlayer using molybdenum trioxide (MoO3) nanobelts decorated with TiN and carbon nanotubes enhances lithium-sulfur batteries. This interlayer compensates for capacity loss and suppresses polysulfide shuttling, improving energy density.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur batteries (LSBs) face challenges from the shuttle effect of lithium polysulfides (LiPSs).
- Existing barrier interlayers often reduce energy density due to their lack of reversible capacity.
Purpose of the Study:
- To develop a freestanding interlayer that restricts LiPS diffusion and provides capacity compensation.
- To investigate the electrochemical performance and LiPS interaction of the novel interlayer.
Main Methods:
- Fabrication of a freestanding α-MoO3 nanobelt interlayer decorated with TiN nanoparticles and carbon nanotubes (MCT).
- X-ray absorption near-edge spectrometry (XANES) to study the capacity compensation mechanism.
- Electrochemical testing of LSBs with the MCT interlayer and high-loading sulfur cathodes.
Main Results:
- The MCT interlayer demonstrated a capacity compensation effect through reversible Li intercalation/deintercalation of MoO3 (1.8–2.8 V), yielding 180 mAh g−1 extra capacity.
- Lithiated α-MoO3 showed strong adsorption towards LiPSs, mitigating the shuttle effect.
- LSBs with the MCT interlayer and a high-loading sulfur cathode (3.0 mg cm−2) retained 713.3 mAh g−1 after 100 cycles.
Conclusions:
- The MCT interlayer effectively suppresses the shuttle effect and compensates for capacity loss in LSBs.
- This multifunctional interlayer strategy enhances the overall energy density and cycle stability of lithium-sulfur batteries.
