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Dynamic Li+ Respiration Effect Enables Cascade Conversion of Lithium Polysulfides for Li-S Batteries
Yan Zhang1, Wei Zhao1, Yanbin Ning1
1State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
Angewandte Chemie (International Ed. in English)
|December 10, 2025
Summary
Researchers developed a new catalysis method for lithium-sulfur batteries using dynamic active sites. This approach enhances polysulfide conversion, enabling stable performance across a wide temperature range.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Lithium-sulfur (Li-S) batteries offer high energy density but suffer from complex multistep reactions.
- Inefficient polysulfide conversion hinders consistent high performance during charging/discharging cycles.
Purpose of the Study:
- To introduce a novel Li+-respiration-effect-induced cascade catalysis strategy.
- To leverage dynamic active sites from in situ potential-modulated TiNb2O7 for improved Li-S battery performance.
Main Methods:
- In situ electrochemical modulation of TiNb2O7 to create dynamic active sites.
- Investigating the Li+ respiration effect on lattice oxygen activation and orbital regulation.
- Utilizing electrochemical-dominated switchable catalysis for sequential intermediate conversion.
Main Results:
- Demonstrated enhanced polysulfide conversion efficiency in Li-S cells.
- Achieved stable cycling performance and wide-temperature operation from -30 to +60 °C.
- A flexible pouch cell retained 94.6% capacity after 120 cycles.
Conclusions:
- The Li+-respiration-effect-induced cascade catalysis offers a new perspective for electrochemical reconstruction.
- This method enables wide-temperature tolerance in lithium-sulfur batteries.
- The dynamic active sites strategy is promising for advanced battery technologies.
Keywords:
Cascade catalysisHigh cathode utilizationLi+ respiration effectLithium–sulfur batteriesWide temperature adaptionMore Related Videos
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