Batteries are quietly undergoing one of the most consequential transformations in modern energy science. A new collection of review articles published in Frontiers in Batteries and Electrochemistry, assembled as the second volume of the journal’s Reviews in Batteries and Electrochemistry series, captures a field that has outgrown its traditional boundaries. The editors behind the collection, Christopher Johnson of Argonne National Laboratory, Jung Ho Kim of the University of Wollongong, and Yang-Tse Cheng of the University of Kentucky, describe a research landscape where materials discovery, electrode engineering, manufacturing science, and digital intelligence are no longer separate disciplines but converging strands of a single effort. The common challenge uniting the featured papers is deceptively simple to state and extraordinarily difficult to solve: how to improve energy density, safety, durability, manufacturability, and real-world operability all at once, across sodium-, lithium-, and zinc-based chemistries.
Among the most striking contributions is a study by Myeong and colleagues that reimagines one of the most overlooked components in a lithium-ion cell: the current collector. Conventionally treated as a passive piece of aluminum foil whose only job is to conduct electrons, the current collector in this work becomes an active safety device. The researchers coated the aluminum foil with melamine polyphosphate, a flame-retardant compound, creating what they describe as a fire-extinguishing current collector. When the coating composition is properly optimized, the layer reduces the self-extinguishing time of a cell undergoing thermal runaway while preserving electrochemical performance. The significance lies in the strategy itself. Rather than reformulating the bulk electrolyte with flame-retardant additives, which can degrade cell performance, the team localized the safety functionality directly at the electrode architecture level. The current collector, in other words, becomes a multifunctional component that improves abuse tolerance without exacting a performance penalty.
Safety through structural innovation also drives a complementary contribution from Wang and co-workers, who engineered a composite solid-state electrolyte for sodium metal batteries. Their material combines a PVDF polymer matrix with a NASICON-type ceramic filler of the composition Na3.7Zr1.45Sc0.4Mg0.15Si2PO12. The optimized electrolyte establishes multiple ion-transport channels, achieving improved room-temperature ionic conductivity, a higher sodium-ion transference number, and better interfacial compatibility with the electrodes. Full cells built with this electrolyte showed strong capacity retention and long-term cycling stability. The work illustrates a broader maturation in solid-state sodium research: progress is coming less from raw conductivity improvements alone and more from careful interfacial design. It also underscores why sodium is attracting growing attention as a lower-cost alternative to lithium, both for stationary grid storage and, potentially, for transport applications.
While safety and interfaces dominate the experimental side of the collection, a different kind of breakthrough appears in the work of Tham and colleagues, who deployed high-throughput computational screening to hunt for new cathode materials for anode-free aqueous zinc batteries. Starting from a pool of more than 1,000 candidate compounds, the team systematically down-selected using a battery of criteria: thermodynamic stability, electrical conductivity, voltage window, stability in aqueous environments, and ion diffusion kinetics. The funnel narrowed to six promising compounds, including ZnNi5Zn4MnO5. The study is a textbook example of how first-principles databases and structured screening pipelines can compress years of trial-and-error experimentation into a computational search. Just as importantly, the work produced design rules linking chemical composition to electrochemical performance, rules that can guide future experimental validation and accelerate materials discovery across the emerging zinc chemistry landscape.
The computational perspective is balanced by a broader strategic assessment from Khan, whose mini-review on sodium-ion batteries frames why the technology continues to attract global investment. Sodium is abundant, inexpensive, and well suited to large-scale storage, but the review is candid about the obstacles that remain. The larger ionic radius of the sodium ion causes greater volume change during cycling, kinetics are comparatively sluggish, and the formation of a stable solid-electrolyte interphase remains problematic. Khan’s conclusion is measured: sodium-ion batteries are highly promising but still require coordinated advances in cathodes, anodes, electrolytes, and separators before reaching full commercial maturity. It is a reminder that in battery science, no single component breakthrough is sufficient; the entire cell must advance together.
Perhaps the most commercially urgent finding in the collection concerns manufacturing rather than chemistry. Lee and colleagues compared dry and wet coating methods for nickel-rich NCM811 cathodes, the high-energy layered oxide materials at the heart of many modern electric vehicle cells. Their results revealed that the coating route itself profoundly shapes surface degradation and, ultimately, cell durability. Wet coating, despite being the conventional industry approach, exposes the cathode surface to water, promoting the formation of a NiO-like surface phase. That phase accelerates cation mixing and resistance growth, quietly eroding performance over the cell’s life. Dry coating, by contrast, suppresses the unwanted phase formation and delivers better capacity retention and rate capability. The lesson is timely: as nickel content climbs in pursuit of higher energy density, the manufacturing process itself becomes as important as the material composition. Performance losses can originate not only from intrinsic material instability but from process-induced surface chemistry.
At the system level, the collection turns to the digital frontier. Madani and colleagues present an expansive review of digital twin technologies for battery systems, charting the emergence of virtual replicas that integrate physics-based modeling, machine learning, cloud-edge computing, and battery management functions. The applications they survey span electric vehicles, stationary storage, production lines, thermal management, state estimation, predictive maintenance, fault diagnosis, and end-of-life handling. Crucially, the review frames digital twins as multiscale entities, spanning everything from cell-level materials to full packs and grid-scale systems. The authors also identify the barriers that stand in the way of widespread adoption: standardization, cybersecurity, computational load, and data quality. Their central message is one of the most important in the entire collection: future battery performance will not be determined by electrochemical materials alone, but by the intelligence of the digital infrastructure that monitors and controls batteries throughout their lifecycle.
Taken together, the papers sketch a coherent map of where the field is heading. Interfaces remain decisive, whether in nickel-rich layered oxides, sodium metal solid-state cells, or flame-retardant current collectors, because interfacial chemistry controls not only capacity fade but also safety and abuse response. Processing matters as much as composition, as the dry-versus-wet coating comparison demonstrates, with subtle differences in synthesis route producing major changes in surface phase evolution and electrochemical behavior. Sodium and zinc chemistries are gaining strategic importance, offering resource and cost advantages and pathways toward aqueous, potentially safer batteries, both benefiting from improved modeling and interface engineering. And digitalization is becoming foundational, connecting electrochemistry with sensing, prediction, and operational control to enable smarter charging, improved health estimation, and lifecycle optimization.
The overarching trajectory is unmistakable. The battery community is moving beyond isolated component optimization toward integrated design across materials, processes, architectures, and cyber-physical control. The editors argue that the future of advanced batteries will likely belong to approaches that combine these domains: safer interfaces, scalable manufacturing, chemistry-aware materials discovery, and intelligent management systems working in concert. As electrification accelerates across transport and grid storage, the cells that succeed will be those designed not as isolated electrochemical devices but as holistic systems, engineered from the atomic interface to the cloud-connected digital twin. This collection offers a strong snapshot of that transition and points toward a more integrated, application-ready era in electrochemical energy storage.
Subject of Research: Recent advances in battery and electrochemistry research spanning safety design, solid-state electrolytes, computational materials discovery, cathode processing, and digital twin systems
Article Title: Editorial: Reviews in batteries and electrochemistry volume II
Article References: Johnson, C., Kim, J. H., & Cheng, Y.-T. (2026). Editorial: Reviews in batteries and electrochemistry volume II. Frontiers in Batteries and Electrochemistry, 5, Article 1985379. https://doi.org/10.3389/fbael.2026.1985379
Image Credits: AI Generated
DOI: 10.3389/fbael.2026.1985379
Keywords: batteries, electrochemistry, lithium-ion, sodium-ion batteries, solid-state electrolytes, zinc batteries, current collector, digital twin, cathode coating, materials discovery, battery safety, energy storage
News Source: Denise Maddox. (October 15, 2026). New Battery Research Converges on Safer Interfaces, Smarter Manufacturing and Digital Twins. Scienmag.
