Compatible Dynamically Wetting Electrolyte–Electrode Interface Design for Solid‐State Lithium–Sulfur Batteries
Abstract
ABSTRACT Solid‐state lithium–sulfur batteries feature high energy density and stability, but their practical application is constrained by limited ion transport at the electrode/solid‐state electrolyte interfaces and safety concerns arising from Li dendrites. This study presents a solid polymer electrolyte (SPSLL) constructed from an ultrathin flame‐retardant sulfonated copolymer (phthalazinone biphenylether sulfone) skeleton, into which a mixed phase of poly(vinylidene fluoride‐co‐hexafluoropropylene), succinonitrile, and lithium bis(trifluoromethanesulfonyl)imide is incorporated, together with a liquid metal interfacial wetting phase. This design enables a dynamic wetting mechanism that facilitates the formation of compatible electrolyte‐electrode interfaces. Through its sulfonated polymer skeleton, SPSLL promotes lithium salt dissociation and enhances thermal stability. Simultaneously, the LM serves as dynamic active sites, both strengthening interfacial physical contact and facilitating the formation of alloyed solid electrolyte interphases. As a result, the SPSLL‐based solid‐state Li‐sulfurized polyacrylonitrile (Li||SPAN) battery exhibits excellent cycling stability, maintaining a capacity retention of 92.2% and a Coulombic efficiency of 99.9% after 500 cycles. Furthermore, the SPSLL single‐layer pouch cell has an initial specific capacity of 948 mAh g −1 . The dynamic wetting strategy presented in this work offers a promising research direction for interface design in solid‐state batteries.
Article Details
Authors (10)
Wanyuan Jiang
State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Technology Innovation Center of High Performance Resin Materials (Liaoning Province)
Danhui Wang
Borui Li
School of Materials Science and Engineering, State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Technology Innovation Center of High Performance Resin Materials (Liaoning Province)
Yunpeng Qu
School of Materials Science and Engineering, State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Technology Innovation Center of High Performance Resin Materials (Liaoning Province)
Shuo Zhuo
School of Materials Science and Engineering, State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Technology Innovation Center of High Performance Resin Materials (Liaoning Province)
Naiwen Hu
School of Materials Science and Engineering, State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Technology Innovation Center of High Performance Resin Materials (Liaoning Province)
Wenkai Song
Lin Wang
Xigao Jian
School of Materials Science and Engineering, State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Technology Innovation Center of High Performance Resin Materials (Liaoning Province)
Fangyuan Hu
School of Materials Science and Engineering, State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Technology Innovation Center of High Performance Resin Materials (Liaoning Province)