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CeVO4/KB Nanoparticles on Shuttle Effect Inhibition in Lithium-Sulfur Battery Separator Modification
Zhijun Zhu1, Zhihong Yu1, Guihuan Chen1
1School of Chemistry, South China Normal University, Guangzhou, 510006, China.
Chempluschem
|October 15, 2024
Summary
Modified separators using CeVO4/KB composites effectively inhibit polysulfide shuttling in lithium-sulfur (Li-S) batteries. This enhancement boosts Li-S battery performance and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high theoretical energy density but suffer from the polysulfide shuttle effect.
- Commercial polypropylene (PP) separators are inadequate for suppressing this shuttle effect, limiting battery performance.
- Developing advanced separators is crucial for realizing the potential of Li-S battery technology.
Purpose of the Study:
- To investigate the efficacy of cerium vanadate (CeVO4)/kilowatt-hour (KB) composites as a modification material for PP separators in Li-S batteries.
- To enhance the adsorption of lithium polysulfides (LiPSs), accelerate Li+ ion migration, and catalyze LiPSs conversion.
- To improve the overall electrochemical performance and cycle life of Li-S batteries.
Main Methods:
- Synthesis of CeVO4/KB composites.
- Modification of commercial PP separators with CeVO4/KB composites.
- Fabrication and electrochemical testing of Li-S batteries utilizing the modified separators.
- Analysis of capacity retention, cycle life, and shuttle effect mitigation.
Main Results:
- CeVO4/KB modified PP separators demonstrated enhanced LiPSs adsorption and accelerated Li+ ion migration.
- The modified separators effectively catalyzed the conversion of LiPSs, reducing the shuttle effect.
- Li-S batteries with CeVO4/KB/PP separators achieved high initial capacities (1200.9 mAh g-1 at 0.2 C) and excellent capacity retention (86.5% after 100 cycles).
- Exceptional long-term stability was observed, with a low capacity decay rate of 0.063% after 1000 cycles at 3 C.
Conclusions:
- CeVO4/KB composites are effective materials for modifying PP separators to inhibit the shuttle effect in Li-S batteries.
- The modified separators significantly improve the rate capability, cycle stability, and overall performance of Li-S batteries.
- This study introduces rare earth metal vanadates as a novel strategy for designing high-performance battery separators.
