Macromolecular Boron-Based Salt Enables Dense Interphases for Long-Cycling Lithium-Sulfur Batteries

Macromolecular Boron-Based Salt Enables Dense Interphases for Long-Cycling Lithium-Sulfur Batteries

© 2025 Wiley‐VCH GmbH.

Détails bibliographiques
Publié dans:Advanced materials (Deerfield Beach, Fla.). - 1998. - 37(2025), 41 vom: 15. Okt., Seite e05762
Auteur principal: Qu, Dejie (Auteur)
Autres auteurs: Liu, Tao, Sun, Youlong, Yan, Yuewei, Li, Chuanchuan, Cui, Zili, Gao, Chuanwei, Kong, Shuaice, Zhang, Zengqi, Liu, Zhiming, Zhang, Shu, Wang, Shitao, Lv, Zhaolin, Xu, Gaojie, Li, Guicun, Cui, Guanglei
Format: Article en ligne
Langue:English
Publié: 2025
Accès à la collection:Advanced materials (Deerfield Beach, Fla.)
Sujets:Journal Article Li‐S batteries interfacial chemistry macromolecular boron‐based salt
Description
Résumé:© 2025 Wiley‐VCH GmbH.
Lithium-sulfur (Li-S) batteries represent a compelling next-generation energy storage system with practical energy densities exceeding 700 Wh kg-1, offering a promising pathway beyond current lithium-ion technology. However, their commercial viability remains constrained by deleterious interfacial reactions between lithium metal anodes and polysulfide-containing electrolytes. Herein, it is presented a molecular engineering approach through a novel boron-based salt, lithium perfluoropinacolatoborate (LiFPB), strategically designed to reinforce the solid electrolyte interphase (SEI) for long-cycling Li-S batteries. LiFPB anions, featuring higher specific charge (mass-to-charge ratio) and larger steric bulk compared to conventional salts, demonstrate enhanced resistance to Helmholtz double-layer repulsion and increased susceptibility to lithium metal reduction, promoting the formation of a robust SEI enriched with LiF and LiBxOy species. The LiFPB-containing electrolyte exhibits superior lithium metal compatibility, achieving a high coulombic efficiency of 99.59%. Consequently, Li-S cells demonstrate markedly improved capacity retention from 50.9% to 75.7% over 200 cycles. This strategy has been successfully scaled to Ah-level Li-S pouch cells, achieving practical energy densities of 408 Wh kg-1 with stable cycling over 75 cycles. This work presents an effective approach to developing long-cycling Li-S batteries through the rational design of electrolyte salt
Description:Date Revised 17.10.2025
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202505762