Molecular Skeleton Programming Enhances Lithium-Sulfur Battery Performance
Researchers have developed a novel molecular skeleton programming strategy to improve the efficiency and longevity of lithium-sulfur batteries, published in Nature. The study introduces 2-chloropyrimidine as a potential 'premediator' that activates in situ into a molecular mediator during sulfur conversion via aromatic nucleophilic substitution. By integrating quantum chemistry with machine learning, the team analyzed the structure-property relationships of side-chain groups to optimize mediating activity. This approach identified 2-chloro-4-(trifluoromethyl)pyrimidine as an optimal candidate from 196 possibilities. Batteries utilizing this premediator demonstrated significant performance improvements, achieving an average capacity retention of 81.7% over 800 cycles and an energy density of 549 Wh kg−1 in 14.2-Ah-level pouch cells. This breakthrough not only addresses key challenges in sulfur electrochemistry but also offers a broader framework for designing functional molecules in organic chemical spaces, potentially accelerating advancements in high-energy-density storage solutions.
Wire timeline
Molecular Skeleton Programming Enhances Lithium-Sulfur Battery Performance
Researchers have developed a novel molecular skeleton programming strategy to improve the efficiency and longevity of lithium-sulfur batteries, published in Nature. The study introduces 2-chloropyrimidine as a potential 'premediator' that activates in situ into a molecular mediator during sulfur conversion via aromatic nucleophilic substitution. By integrating quantum chemistry with machine learning, the team analyzed the structure-property relationships of side-chain groups to optimize mediating activity. This approach identified 2-chloro-4-(trifluoromethyl)pyrimidine as an optimal candidate from 196 possibilities. Batteries utilizing this premediator demonstrated significant performance improvements, achieving an average capacity retention of 81.7% over 800 cycles and an energy density of 549 Wh kg−1 in 14.2-Ah-level pouch cells. This breakthrough not only addresses key challenges in sulfur electrochemistry but also offers a broader framework for designing functional molecules in organic chemical spaces, potentially accelerating advancements in high-energy-density storage solutions.
Nature