Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Featured articles
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  • Volume 93 (2025) Issue 7 Pages 077005
    Mechanochemical Synthesis of Potassium–Ion Conductor K3SbS4 Read more
    Editor's pick

    The Editorial Board of Electrochemistry selected this paper entitled “Mechanochemical Synthesis of Potassium-Ion Conductor K3SbS4”, by Takehiro Nakao et al. as an Editor’s Choice. All solid-state potassium-ion batteries are regarded as potential candidate energy storage technologies of post lithium-ion batteries owing to various advantageous characteristics. It is well recognized in the community that the chemical composition of solid electrolytes dominates their ionic conductivity. In this article, the effect of the starting reagent, K2S, was investigated with respect to its purity and relative quantity. Comprehensive compositional analyses revealed the substantive composition of commercially available K2S, and the desired solid electrolyte β-K3SbS4 having greater ionic conductivity was obtained by precise control of amount of the starting reagents combined with the post heat treatment.

  • Volume 93 (2025) Issue 6 Pages 063001
    Moisture Stability of Sulfide Solid Electrolytes: Systematic Comparison and Mechanistic Insight Read more
    Editor's pick

    This article is titled “Moisture Stability of Sulfide Solid Electrolytes: Systematic Comparison and Mechanistic Insight” by Dr. Yusuke Morino et al. selected as an Editor’s Choice for the 71st Special Feature, “New Progress of Batteries and Fuel Cells” recommended jointly by the guest editors from The Committee of Battery Technology and the editorial board. In this article, the authors systematically investigate the moisture stability of various sulfide solid electrolytes (SEs) and elucidate distinct mechanisms responsible for the degradation of lithium ionic conductivity upon exposure to moisture. A quantitative comparison was conducted for SEs with different crystal structures, including Li6PS5Cl, Li3PS4, and Li4SnS4, in order to offer a more comprehensive understanding of their respective degradation behaviors. This comparative study revealed that the SEs undergo two different degradation pathways: hydrolysis and hydration. Notably, both Li3PS4 and Li4SnS4 exhibited a comparable decline in lithium ionic conductivity to that of Li6PS5Cl, despite generating significantly less H2S gas. This observation suggests that the underlying deterioration mechanisms differ among the materials.

  • Volume 93 (2025) Issue 6 Pages 063006
    Chemical Composition-Driven Machine Learning Models for Predicting Ionic Conductivity in Lithium-Containing Oxides Read more
    Editor's pick

    “Chemical Composition-Driven Machine Learning Models for Predicting Ionic Conductivity in Lithium-Containing Oxides” by Yudai Iwamizu et al. selected as an Editor’s Choice for the 71st Special Feature, “New Progress of Batteries and Fuel Cells” recommended jointly by the guest editors from The Committee of Battery Technology and the editorial board. In this article, the authors present machine learning models that predict the ionic conductivity of lithium-ion conductive solid oxide electrolytes based solely on their chemical composition. High ionic conductivity is essential for the development of high-performance all-solid-state batteries (ASSBs), making solid electrolytes a critical component. The proposed models, trained on over 2,200 data entries, significantly outperform previous approaches. Notably, configurational entropy emerged as a key feature in predicting ionic conductivity. The models also generalize well to previously unseen systems, facilitating the efficient discovery of promising solid electrolytes for ASSBs.

  • Volume 93 (2025) Issue 6 Pages 063011
    Measurement of Side-Reaction Currents in Lithium-Ion Batteries with Different Capacity Ratios Read more
    Editor's pick

    “Measurement of Side-Reaction Currents in Lithium-Ion Batteries with Different Capacity Ratios” by Prof. Kingo Ariyoshi et al. selected as an Editor’s Choice for the 71st Special Feature, “New Progress of Batteries and Fuel Cells” recommended jointly by the guest editors from The Committee of Battery Technology and the editorial board. The side-reaction current (ISR) significantly contributes to capacity fading, primarily due to state-of-charge imbalances between the positive and negative electrodes in lithium-ion batteries. In this study, the authors conducted a detailed analysis of three types of ISR based on electrochemical behavior, using electrodes with different loadings and varying positive/negative capacity ratios. The results revealed that an additional ISR, caused by internal crosstalk within the battery, depends on the concentration of side-reaction products. Controlling this ISR by adjusting its magnitude is essential for extending battery life. This study provides valuable insights into strategies for improving the longevity of lithium-ion batteries.

  • Volume 93 (2025) Issue 6 Pages 067003
    Mechanistic Insights into Electrooxidative Allylation of a Carbamate in the Presence of Solid-Supported Acids Read more
    Editor's pick

    “Mechanistic Insights into Electrooxidative Allylation of a Carbamate in the Presence of Solid-Supported Acids” by Ms Haruka Homma et al. as an Editor’s Choice. In this work, the authors successfully demonstrated electrooxidative carbon–carbon bond formation of a carbamate with allyltrimethylsilane, aided by in-situ generated HBF4 species. Electrochemical oxidation of organic compounds is a highly promising strategy for generating reactive and versatile carbocations in organic synthesis. To effectively control subsequent nucleophilic reactions with these carbocations, the authors introduced a solid-supported acid, which generated HBF4 and promoted the desired C–C bond formation. Detailed mechanistic analysis revealed that in-situ generated HBF4 plays a crucial role in enabling carbon-carbon bond formation of a carbamate with allyltrimethylsilane.

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