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Reducing our carbon footprint is one of the most pressing issues facing humanity today. The technology of Li‐rechargeable batteries is permeating every corner of our lives as a result of our efforts to reduce the use of carbon energy. Batteries can be seen metaphorically as "living cells", and approaching the future of that technology requires observing and understanding the real‐time phenomena that occur inside battery systems during (electro)chemical reactions. In this regard, in situ analysis techniques have made significant progress toward understanding the basic science of battery systems and finding better performance‐improving factors. There are various analysis methods utilizing electromagnetic waves, electrons, and neutrons to perform multifaceted analyses of battery systems from the atomic to the macroscopic scale. Now is the opportune moment to construct a comprehensive guide that facilitates the design of advanced Li‐rechargeable battery systems, adopting a highly discerning and all‐encompassing approach toward these cutting‐edge technologies. In this review article, we discuss and organize the key components such as capabilities, limitations, and practical tips with a comprehensive perspective on various in situ techniques. Moreover, this article covers a wide range of information from the nano to the micrometer scale, such as electronic, atomic, crystal, and morphological structures, from stereoscopic perspectives considering the probing depth. [ABSTRACT FROM AUTHOR]

The article "Carbon Energy" discusses the importance of analyzing dynamic processes within Li rechargeable battery cells without disassembly to understand reaction mechanisms and develop next-generation batteries. The back cover image shows a green cylindrical battery divided into three parts: examining crystal structure of electrode materials, dynamics of Li ions, and morphology of electrodes through in situ analysis. The review details in situ analytical techniques for Li rechargeable batteries using electromagnetic waves, electrons, neutrons, and other sources. [Extracted from the article]

Uplifting the charging voltage of LiCoO 2 is crucial for surpassing current energy density thresholds in Li-ion batteries. However, the structural and chemical instability of LiCoO 2 in the deeply delithiated state is a major obstacle to the practical implementation of high-voltage LiCoO 2 . This study proposes a multi-element co-doped LiCoO 2 that exhibits enhanced electrochemical performances at 4.6 V (vs Li/Li + ). Al, Mg, and F are doped at three distinct lattice sites, and the contributions of each dopant are investigated using advanced synchrotron X-ray analyses and electron microscopies. Al and Mg delay the detrimental transition to the H1-3 phase and facilitate a smoother phase transition, thereby preserving particle robustness. The electronegative anion dopant F mitigates oxygen oxidation and ensures a wider range of transition metal redox reactions. These enhancements enable the particles to withstand numerous cycles without severe cracking or surface degradation, thereby significantly improving cyclability. Consequently, the tri-site doping strategy effectively minimizes capacity sacrifice and bolsters battery performance, with every dopant functioning synergistically., (© 2024 Wiley‐VCH GmbH.)