Deciphering the Role of Fluoroethylene Carbonate towards Highly Reversible Sodium Metal Anodes
作者机构：Institute of New Energy for VehicdesShanghai Key Laboratory of Developmrent&Apication for Metali Functional MaterialsSchool of Materials Science and EngineringTongji UniversitShanghai 201804China Instiute of PhysicsChinese Academy of SciencesSchoo of Plhysical SciencesUniversity of Chinese Academy of SciencesBeiing 100190China Key Laboratory of Advanced Civil Engineering Materials(Tongji University)Ministry of EducationShanghai 201804China Key Laboratoryfor UV Light Emiting Materials and TechnologyNortheast Normal UniversilyMinistry of EducationChangchumJilin 130024China Tianmu Lake Institute of Advanced Energy Storage Technologies Co.LtdLiyangJiangsu 213300China State Key Laboratory of Materials Procssing and Die&Mould TechnologySchoo of Materials Science and Engineering Huazhong University of Science and TechnologyWuhanHubei 430074China
出 版 物：《Research》 (研究（英文）)
年 卷 期：2022年第2022卷第2期
页 面：259-269页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学]
基 金：sponsored by the National Natural Science Foundation of China(NSFC Nos.21975186,51632001,and 22005334) supports from Natural Science Foundation of Beijing(grant No.Z200013)
主 题：electrolyte otherwise Highly
摘 要：Sodium metal anodes(SMAs)sufer from extremely low reversibility(95%with conventional NaPF。salt at a regular concentration(1.0M).The peculiar role of FEC is *** via its involvement into the solvation structure,where a threshold FEC concentration with a coordination number1.2 is needed in guaranteeing high Na reversibility over the ***,by incorporating an average number of 1.2 FEC molecules into the primary Na*solvation sheath,lowest unoccupied molecular orbital(LUMO)levels of such Nat-FEC solvates undergo further decrease,with spin electrons residing either on the O=C 0(O)moiety of FEC or sharing between Na*and its C=:O bond,which ensures a prior FEC decomposition in passivating the Na surface against other carbonate ***,by adopting cryogenic tranmission electron microscopy(cryo-TEM),we found that the Na filaments grow into substantially larger diameter from-400nm to1 pum with addition of FEC upon the threshold *** crstalline and much thiner(-40 nm)slid-electrolyte interphase(SED)is consequently observed to uniformly wrap the Na surface,in contrast to the severely corroded Na as retrieved from the blank *** potence of FEC is further demonstrated in a series ofcorrosive solventssuch as ethy!l acetate(EA)。trimethyl phosphate(TMP),and actonitrile(AN)enabling highly reversible SMAs in the otherwise unusable solvent systems.
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