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Updated: May 8, 2026
12:30
Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
Published on: April 9, 2018
Molecular skeleton programming of premediators in sulfur electrochemistry
Runhua Gao1, Yifei Zhu1, Shengyu Tao1
1Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, P.R. China.
Nature
|May 6, 2026
Summary
Researchers developed a molecular skeleton programming strategy to design premediators for lithium-sulfur batteries. This approach optimizes mediator performance, enhancing battery capacity retention and energy density.
Area of Science:
- Electrochemistry
- Materials Science
- Computational Chemistry
Background:
- Molecular mediators are crucial for enhancing electrolyte chemistry in lithium-sulfur batteries.
- Understanding the influence of molecular structure on mediator performance is limited.
- Current research focuses on elucidating mechanistic roles but lacks skeletal regulation insights.
Purpose of the Study:
- To investigate the impact of molecular skeleton regulation on mediator effectiveness in lithium-sulfur batteries.
- To develop a predictive strategy for designing novel molecular mediators.
- To optimize premediator activation and mediating activity through molecular design.
Main Methods:
- Proposed 2-chloropyrimidine as a model 'premediator' activated via aromatic nucleophilic substitution.
- Integrated quantum chemistry and machine learning for molecular skeleton programming.
- Analyzed structure-property relationships between molecular features and mediating performance.
Main Results:
- Identified 2-chloro-4-(trifluoromethyl)pyrimidine as a superior premediator from 196 candidates.
- Achieved 81.7% capacity retention over 800 cycles in lithium-sulfur batteries.
- Demonstrated a high energy density of 549 Wh kg⁻¹ in a large-scale pouch cell.
Conclusions:
- Molecular skeleton programming offers a powerful approach to design high-performance premediators.
- The developed strategy enables control over premediator activation and activity.
- This work paves the way for designing advanced functional molecules for energy storage applications.
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