The FAULTS program is a powerful tool for the refinement of diffraction patterns of materials with planar defects. A new release of the FAULTS program is herein presented, together with a number of new capabilities, aimed at improving the refinement process and evolving towards a more user‐friendly approach. These include the possibility to refine multiple sets of single‐crystal profiles of diffuse streaks, the visualization of the model structures, the possibility to add the diffracted intensities from secondary phases as background and the new DIFFaX2FAULTS converter, among others. Three examples related to battery materials are shown to illustrate the capabilities of the program.

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Lithium metal batteries (LMBs) are one of the most promising energy storage technologies that would overcome the limitations of current Li‐ion batteries, based on their low density (0.534 g cm−3), low reduction potential (−3.04 V vs Standard Hydrogen Electrode) as well as their high theoretical capacities (3860 mAh g−1 and 2061 mAh cm−3). The overall cell mass and volume would be reduced while both gravimetric and volumetric energy densities would be greatly improved. Their electrochemical performance, however, is hampered by the low efficiency at high current densities and continuous degradation, which are related, among other factors, to the properties of the lithium metal anode (LMA). Hence, the production and processing of LMAs is crucial to obtain the desired properties that would enable LMBs. Here, the conventional method used for the production of LMAs, which is the combination of extraction, electrowinning, extrusion, and rolling processes, is reviewed. Then, the advances in the different alternative methods that can be used to produce and improve the properties of LMAs are described, which are divided into vapor phase, liquid phase, and electrodeposition. Within this last method, the anode‐less concept, for which different approaches to the development of advanced current collectors are illustrated, is included.

High-energy density Li-ion batteries (LIBs) are expected to respond to the increasing energy demand related to the fast-growing industry of portable electronic devices, electric vehicles, and smart grid applications, as well as wearable devices and medical implants. The use of high-voltage cathodes, working up to 5 V and beyond, is probably the most straightforward way to achieve this purpose. Being the spinel LiNi 0.5 Mn 1.5 O 4 (LNMO), with a theoretical specific capacity of 147 mAh g −1 , the top choice for the next generation of highenergy density LIBs. [1] However, the main strength of this material, namely, its high operating voltage ≈4.7 V nested in the redox potential of the Ni 2+/3+ and Ni 3+/4+ couples, [2] is also the origin of its main limitation: the decomposition at high voltages of the liquid electrolytes used in standard LIBs. In this sense, solid state batteries represent a valid solution stemmed, among others, on the wide electrochemical stability window displayed by some solid electrolytes. [3,4] Within this category, the case of thin-film solid state batteries [5,6] is of great interest, especially for certain thin-film electrolytes that would present manufacturing advantages at industrial level, [7][8][9] thus enabling the production and commercialization of the next generation Li-ion batteries. The fabrication method and the battery configuration will also be important factors to consider. A paradigm shift in terms of electrode fabrication methods and battery architecture is needed if new horizons are going to be reached, for example, concerning solvent-and additive-free electrodes, faster production methods, and/or more efficient use of the raw materials in the battery fabrication process.Atomic layer deposition (ALD) is considered the premier technique for processing thin-film components owing to its surface conformality, repeatability, scalability, and delivery of pinhole-free coatings. [10] Indeed, its suitability has been demonstrated for the fabrication of several solid electrolytes, including