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The increasing demand for electric vehicles (EVs) has prompted extensive research in the development of lithium-ion batteries (LIBs) with high volumetric energy density. The graphite anode possesses a tap density of 2.25 g cc−1, resulting in a volumetric energy density of over 770 W h L−1. However, the practical electrode density of 1.4–1.6 g cc−1 leads to a lower volumetric energy density of ∼550 W h L−1, and increasing electrode density beyond 1.6 g cc−1 is limited owing to the pore closure and poor electrolyte penetration, which leads to an imbalance in the N/P ratio resulting in Li metal plating. Hence, enhancing the electrolyte permeation into the densely packed graphite electrode is the crucial aspect for achieving high volumetric energy density. In this research, we coated a functional polymer (cyanoethyl polyvinyl alcohol), which has a high electrolyte absorption capability on a conventional graphite anode to enhance the electrolyte penetration into the highly densified graphite. As a result, the electrode demonstrated a high cycle stability under a high electrode density of 1.9 g cc−1 without any Li plating, and drastic degradation of capacity retention resulted in a remarkable volumetric energy density exceeding 650 W h L−1. [ABSTRACT FROM AUTHOR]

The utilization of Si anode in sulfide‐based all‐solid‐state batteries (ASSBs) has gained more research attention in recent years to overcome the interface challenges associated with ASSB‐containing Li metal anode. However, the volume expansion feature of the Si, stress/strain evolution inside the electrode, and the parasitic side reaction at the Si/sulfide SE interface are the most predominant limiting factors for practical device applications. It is necessary to investigate and understand the interface challenges through in‐depth analysis in real‐time battery operation to design highly efficient ASSBs for commercial device applications. Hence, this perspective paper provides a summary of the characterization tools and the analysis results related to the Si/sulfide SE interface. Moreover, in this perspective, we emphasize the importance of further investigation of the interface through more advanced in‐depth/operando analysis tools to gain insightful information about the anodic interface, which could be useful for the researchers to design efficient research strategies for solving the challenging issues associated with the anodic interface. [ABSTRACT FROM AUTHOR]

The front cover of the journal article "Recent Progress of In-Depth Analysis Techniques for Si Anodes in Sulfide-Based All-Solid-State Batteries: A Concise Overview and Future Perspective" features an image of the interface between the sulfide-based solid electrolyte and silicon anode in all-solid-state lithium-ion batteries. The image highlights the importance of studying the electrode/electrolyte interface in order to design high-energy batteries. The authors argue that more advanced analysis tools are needed to fully understand the interface kinetics and charge transport mechanism for developing efficient battery systems for electric vehicles and portable devices. The article provides further information on this topic. [Extracted from the article]