2. Decoupling Oxygen Redox from O_₂ Release in Li-and Mn-Rich Layered Cathodes: Mechanisms, Metrics, and Design Rules.
Techin Mamiamuang and Montree Sawangphruk.
Journal :  Journal of Materials Chemistry A, 2026.
Impact Factor : 9.5, Q1, CiteScore : 16.7, H-index 318.
DOI : 10.1039/D5TA07671D.
Abstract : Lithium- and manganese-rich (LMR) layered oxides can deliver >250 mAh g⁻¹ by engaging anionic (oxygen) redox, yet their promise is undermined when oxygen redox couples to O₂ formation, triggering transition-metal migration, layered→spinel/rock-salt reconstruction, interfacial breakdown, and voltage fade. This review reframes LMR development around a single objective—decouple reversible oxygen redox from O₂ release—and organizes the field into mechanisms, metrics, and design rules. We first clarify the mechanistic pathways that produce oxidized-oxygen species versus molecular O₂ and map how these pathways propagate stress, porosity/voids, and interfacial reactivity. We then define a decision-grade metric set to distinguish O-redox from O₂ evolution under practical conditions, including gas quantification at realistic cutoffs (≥4.5 V), operando O-species fingerprints (e.g., RIXS/¹⁷O probes), proxies for transition-metal migration, and tracking of microstructural change (voids, reconstruction, impedance growth). Finally, we translate diagnostics into actionable design rules spanning (i) bulk/composition (Mn-valence control, Li/TM ordering, concentration gradients, high-entropy chemistries), (ii) architecture and interfaces (primary-particle coatings; thin, Li⁺-conductive, acid-scavenging layers; oxygen-tolerant CEIs), and (iii) electrolytes (fluorinated and localized-high-concentration systems with targeted additives). Emerging concepts—dynamic oxygen buffers, self-regenerating interphases, and solid/gel interlayers—are assessed against application-relevant benchmarks (areal loading, temperature, gas evolution, N/P balancing, scalable synthesis). We conclude with prioritized experiments and go/no-go criteria to accelerate durable, high-voltage LMR commercialization.

1. Influence of atomic layer deposition on nickel hydroxide phase transitions in nickel foam.
Samutr Assavachin, Surat Prempluem, Somlak Ittisanronnachai, Sukritta Janprakhon, Montree Sawangphruk.
Journal :  Electrochemistry Communications, 2026, 108091.
Impact Factor : 4.2, CiteScore : 7.6, H-index 219.
DOI : 10.1016/j.elecom.2025.108091.
Abstract : This study investigates how Al2O3 and V2O5 coatings deposited on nickel foam by atomic layer deposition (ALD) modifies its electrochemical phase evolution in alkaline media. Phase transitions and surface kinetics were characterized using cyclic voltammetry (CV), in situ X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and Tafel analysis. Bare NF exhibits a positive cathodic peak shift for α-Ni(OH)2 formation over 100 CV cycles attributed to surface activation. NF coated with Al2O3 (NF-A) showed a larger shift (+90 mV) indicating enhanced charge transfer kinetics and reduced energy barrier. In contrast, V2O5-coated NF (NF-V) showed no shift suggesting a suppressed surface kinetics. These shifts disappear at higher scan rates suggesting a kinetic effect rather than a diffusion-induced behavior. Tafel and EIS measurements show that NF-A has the lowest charge transfer resistance, while NF-V exhibits the largest resistance. In situ XRD provides direct evidence for α-Ni(OH)2 formation during extended cycling under alkaline conditions. These results demonstrate that different ALD coatings can selectively modulate surface kinetics and phase accessibility of nickel foam which can contribute to the design of nickel-based electrodes for phase-specific electrochemical applications.