双层锰酸盐正极LaSr2Mn2O6.96在全固态氟离子电池中的结构与电化学行为OA
Structural and electrochemical behaviour of bilayer manganite LaSr2Mn2O6.96 cathode for all-solid-state fluoride ion batteries
本研究探讨了Ruddlesden-Popper型双层锰酸盐LaSr2Mn2O6.96作为全固态氟离子电池(FIBs)插层型正极材料的潜力.通过非原位X射线衍射分析了LaSr2Mn2O6.96在氟离子嵌入/脱嵌过程中的结构变化,发现F-的嵌入会形成三种不同的四方相.为理解这些物相的复杂行为,采用X射线吸收光谱和磁学测量手段研究了Mn氧化态及配位环境的变化.在20 kN的堆叠压力和1 V至-1 V电位区间的电化学循环中,LaSr2Mn2O6.96的比容量从初始的～30 mAh g-1持续增加至200次循环后的～68 mAh g-1,库仑效率达～99%,且未出现容量衰减迹象.这表明双层锰酸盐LaSr2Mn2O6.96有望成为循环稳定的全固态FIBs正极材料,尤其是在施加堆叠压力的条件下.
In this study,we explore the potential of the Ruddlesden-Popper(RP)-type bilayer manganite LaSr2Mn2O6.96 as an intercalation-based cathode material for all-solid-state fluoride ion batteries(FIBs).Structural changes of LaSr2Mn2O6.96 during fluoride intercalation and de-intercalation were analyzed via ex situ X-ray diffraction,revealing that F-insertion induces the formation of three distinct tetragonal phases.To understand the complex behavior of these phases,we examined the changes in the Mn oxidation state and coordination environment using X-ray absorption spectroscopy and magnetic measurements.Under stack pressure(20 kN),electrochemical cycling of LaSr2Mn2O6.96 in the potential range of 1 V to-1 V exhibited a continuous increase in specific capacity from capacity of～30 mAh g-1 to～68 mAh g-1 over 200 cycles,with～99%coulombic efficiency and no signs of capacity fading.This makes the bilayer manganite LaSr2Mn2O6.96 a promising candidate for a cycling stable cathode for all-solid-state FIBs,especially under the application of stack pressure.
Vanita Vanita;Roland Schoch;Pascal Puphal;Hasan Yilmaz;Matthias Bauer;Oliver Clemens
University of Stuttgart,Institute for Materials Science,Materials Synthesis Group,Heisenbergstraße 3,70569 GermanyInstitute of Inorganic Chemistry and Center for Sustainable Systems Design (CSSD),Paderborn University,Warburger Straße 100,33098 Paderborn,GermanyMax-Planck-Institute,Heisenbergstr. 1,70569 Stuttgart,GermanyUniversity of Stuttgart,Institute for Materials Science,Materials Synthesis Group,Heisenbergstraße 3,70569 GermanyInstitute of Inorganic Chemistry and Center for Sustainable Systems Design (CSSD),Paderborn University,Warburger Straße 100,33098 Paderborn,GermanyUniversity of Stuttgart,Institute for Materials Science,Materials Synthesis Group,Heisenbergstraße 3,70569 Germany
化学化工
电池全固态氟离子电池氟化脱氟Ruddlesden-Popper型结构双层锰酸盐插层型正极电化学性能
BatteryAll solid-state fluoride ion batteryFluorinationDefluorinationRuddlesden-Popper type structureBilayer manganiteIntercalation-type cathodeElectrochemical performance
《物理化学学报》 2026 (3)
101-117,17
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