Carbonate-electrolyte-based lithium–sulfur(Li–S)batteries with solid-phase conversion offer promising safety and scalability,but their reversible capacities are limited.In addition,large-format pouch cells are pavin...Carbonate-electrolyte-based lithium–sulfur(Li–S)batteries with solid-phase conversion offer promising safety and scalability,but their reversible capacities are limited.In addition,large-format pouch cells are paving the way for large-scale production.This study demonstrates the in situ formation of a solid-electrolyte interphase(SEI)as a protective layer using vinylene carbonate(VC),highlighting its industrial adaptability.A high reversible capacity is achieved by the lithiated poly-VC SEI formed inside the cathode particles as a nanoscale ionic conduction path,along with the traditional surface protective layer.Furthermore,the severe dissolution of poly-VC is mitigated by LiF derived from fluorine ethylene carbonate as a co-solvent,enabling high rate performance and a long cycle life.A large 8 Ah pouch cell is successfully developed,which shows a high energy density of 400 Wh kg^(−1) based on the cell weight.This work demonstrates the high performance of large-scale Li–S batteries with the in situ formation of a protective layer as a scalable technique for future applications.展开更多
基金This study was performed under the“Research andDevelopment of Advanced Aircraft Systems for PracticalApplication(JPNP15005)”project commissioned by theNew Energy and Industrial Technology DevelopmentOrganization(NEDO)The C,O,and S K-edge XANESexperiments were conducted at BL1N2 and BL6N1 of theAichi Synchrotron Radiation Center,Aichi Science&Technology Foundation,Aichi,Japan(Proposal Num-bers 202103016 , 202102100)
文摘Carbonate-electrolyte-based lithium–sulfur(Li–S)batteries with solid-phase conversion offer promising safety and scalability,but their reversible capacities are limited.In addition,large-format pouch cells are paving the way for large-scale production.This study demonstrates the in situ formation of a solid-electrolyte interphase(SEI)as a protective layer using vinylene carbonate(VC),highlighting its industrial adaptability.A high reversible capacity is achieved by the lithiated poly-VC SEI formed inside the cathode particles as a nanoscale ionic conduction path,along with the traditional surface protective layer.Furthermore,the severe dissolution of poly-VC is mitigated by LiF derived from fluorine ethylene carbonate as a co-solvent,enabling high rate performance and a long cycle life.A large 8 Ah pouch cell is successfully developed,which shows a high energy density of 400 Wh kg^(−1) based on the cell weight.This work demonstrates the high performance of large-scale Li–S batteries with the in situ formation of a protective layer as a scalable technique for future applications.
