The rapid growth of renewable energy sources, electric vehicles, and portable electronics has increased demand for efficient energy storage solutions. Concerns over the availability of lithium resources, environmental impact, safety issues and the rising cost of raw materials highlight the need for alternative battery technologies. Exploring other battery systems, such as solid-state lithium , sodium (Na + ) , magnesium (Mg 2+ ) , fluoride (F -) offers the potential to overcome the limitations of Li-ion batteries while providing safer, more sustainable, and cost-effective energy storage solutions for the future. These technologies promise enhanced safety, lower environmental impact, greater raw material availability and improved performance under specific conditions. One of the new technologies is the fluoride-ion battery (FIB), which offers several potential advantages compared to other battery technologies. FIBs have the potential to exceed lithiumion batteries (LIBs) in both gravimetric and volumetric energy densities, making them particularly appealing for electric vehicles and large-scale energy storage. Beyond their high energy density, FIBs offer distinct advantages. Fluorine, being the strongest oxidizing agent and the most electronegative element, results in a highly redox-stable fluoride ion and a broad electrochemical potential window. In principle, the higher open circuit voltage translates to improved energy density, making FIBs a promising candidate for next generation energy storage systems. Furthermore, the global fluorine production is nearly two orders of magnitude higher than that of lithium, making fluorine a highly promising and cost-effective alternative for developing FIBs as a substitute for Li-ion battery technologies. FIB electrode materials store energy through two main reaction mechanisms: conversion and intercalation. Conversion-based electrodes offer higher specific capacities than intercalationbased ones by converting a metal into its corresponding binary fluoride, enabling multiple electron transfers per redox-active metal species . However, this process causes significant volume changes due to structural transformations, leading to degradation in electrochemical performance. Intercalation-based electrodes, on the other hand, store fluoride ions by inserting them into vacancies or interstitial sites within a stable host structure. These materials provide better cycling performance with minimal volume change but generally have lower specific capacities due to the presence of redox-inactive species in the host structure. Among intercalation-based materials, Ruddlesden-Popper-type (RP-type) oxides with general formula An+1BnX3n+1, show strong potential for FIB cathodes due to their ability to reversibly insert fluoride ions. The n=1 family is the most promising, offering higher energy density compared to the n=2 and n=3 variants. Different RP-type oxides have already been tested, e.g. La2NiO4 , La2CoO4 29 , LaSrMnO4 . Among these LaSrMnO4 stands out for its high fluoride incorporation and lower environmental impact compared to nickel and cobalt-based alternatives. The structure is composed of alternating layers of (La/Sr)MnO3 perovskite and (La/Sr)O rock salt subunits along the c-axis, resulting in a tetragonal symmetry (I4/mmm), with strontium and lanthanum being randomly distributed in the same crystallographic site. Within the boundary between the rock salt and perovskite layers, there are large interstitial sites that can be occupied by fluoride ions. If all interstitial sites are filled, the overall composition becomes LaSrMnO4F2, indicating that the structure can ideally accommodate two fluoride ions per formula unit (see Figure ) at the interstitial sites, which are not directly bonded to transition metal cations.