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Enhancing Catalysis and Sieving Polysulfides by Oxygen Vacancy-Rich Separator Modifier for High-Performance Li-S
Liyu Du1, Jun Sun2,3, Yiming Zhang1
1Department of Advanced Energy, Materials College of Materials Science and Engineering College of Materials Science and Engineering, Sichuan University, Chengdu, 61006, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|August 28, 2025
Summary
A novel separator modifier, Fe-doped H2TiO3 on reduced graphene oxide (rGO/H2TiO3-x-Fe), enhances lithium-sulfur (Li-S) battery performance by controlling polysulfide intermediates and boosting catalysis.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries face challenges like low active material utilization, slow kinetics, and Li anode corrosion due to lithium polysulfide (LiPSs) dissolution.
- Developing effective strategies to mitigate LiPSs shuttling and enhance Li anode stability is crucial for advancing Li-S battery technology.
Purpose of the Study:
- To design a novel separator modifier, Fe-doped H2TiO3 anchored on reduced graphene oxide (rGO/H2TiO3-x-Fe), to simultaneously address LiPSs dissolution and Li anode corrosion in Li-S batteries.
- To investigate the role of tunable Fe-doping and oxygen vacancies (OVs) in controlling LiPSs adsorption and catalytic conversion.
Main Methods:
- Synthesis of rGO/H2TiO3-x-Fe via dopant selection and doping content optimization.
- Characterization of the material's properties, including Lewis acid character, oxygen vacancy generation, and electronic conductivity.
- Evaluation of the modified separator's performance in Li-S cells, focusing on cycling stability, power capability, and shelving performance.
Main Results:
- The rGO/H2TiO3-x-Fe modifier exhibits tunable Lewis acid character due to Fe-doping and OVs, enabling selective adsorption of LiPSs.
- The modifier effectively blocks long-chain LiPSs while allowing partial Li2S4 to pass, forming a robust solid electrolyte interphase (SEI) that suppresses Li dendrite growth and corrosion.
- Fe-doping enhances electronic conductivity and catalytic activity for LiPSs redox reactions, accelerating their conversion.
Conclusions:
- The synergistic effect of the sieving effect and enhanced catalysis provided by the rGO/H2TiO3-x-Fe modified separator leads to remarkable cycling (0.035% fading rate at 5 C over 1000 cycles), power, and shelving performance in Li-S batteries.
- This strategy of rational dopant selection and OV regulation offers a universal approach for designing high-performance separators for the industrialization of Li-S batteries.
