Rika Hagiwara

Secure and Mild Electrochemical F 2 Gas Generation from Electrolysis of Tin(II) Fluoride: Investigating the Electrochemical Behavior of the SnF 2 /CsF‐2.45HF System

Yuki Shukuno, Rika Hagiwara, Kazuhiko Matsumoto

In spite of wide‐ranging applications in various fields, the high reactivity and difficulty in storage of elemental fluorine pose significant safety concerns, creating a strong demand for safe, small‐scale, and on‐site generation methods. Herein, the electrochemical behavior of SnF 2 dissolved in …

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Ternary Potassium Single Cation Ionic Liquid Electrolyte for Potassium Secondary Batteries

Hiroki Yamamoto, Keigo Kubota, Jinkwang Hwang, Kazuhiko Matsumoto et autres

Potassium single cation ionic liquids (K-SCILs), which solely contain K + as the cationic species, realize exceptionally high K + concentrations and exhibit unique physicochemical and electrochemical properties. However, K-SCILs tend to have high melting points due to the smaller size of …

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Ionic Liquid and Ionic Plastic Crystal Electrolytes Compatible with Silver Positive Electrode for Fast Charge/Discharge Fluoride-Shuttle Batteries at Room Temperature

Takayuki Yamamoto, Kazuhiko Matsumoto, Rika Hagiwara, Toshiyuki Nohira

High Resolution Image Download MS PowerPoint Slide Fluoride shuttle batteries (FSBs) have been acclaimed as prospective candidates for next-generation energy applications for their superior energy densities that transcend state-of-the-art lithium-ion battery performances. Despite these prospects, their practical deployment has been heavily afflicted …

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Reassessing the Quantity of Lithium in Metal Batteries: The Less Is More Philosophy from Metal-Free to Metal Anode

Di Wang, Jie Qiu, Naoki Inui, Rika Hagiwara et autres

Lithium metal-free batteries (LMFBs, often called anode-free batteries), characterized by the absence of pre-loaded lithium metal or host materials at the anode, have emerged as a focal point in battery research due to their theoretically highest energy density.[1] However, LMFBs face significant …

Entropy‐Driven 60 mol% Li Electrolyte for Li Metal‐Free Batteries

Shengan Wu, Yuhi Nishigaki, Rika Hagiwara, Jinkwang Hwang et autres

Abstract Highly Li‐concentrated electrolytes are acknowledged for their compatibility with Li metal negative electrodes and high voltage positive electrodes to achieve high‐energy Li metal batteries, showcasing stable and facile interfaces for Li deposition/dissolution and high anodic stability. This study aims to explore …

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Functionalization and Applications of Molten Salts and Ionic Liquids

Rika Hagiwara

The author and co-workers developed 1-ethyl-3-methylimidazolium fluorohydrogenate (fluorohydrogenate anion: (FH)nF−), which had the ionic conductivity of 100 mS cm−1, the highest among those of ionic liquids reported to date, and clarified its physical properties and structures. We also applied an ionic liquid …

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Entropy-driven 60 mol% Li Electrolyte

Shengan Wu, Yuhi Nishigaki, Rika Hagiwara, Jinkwang Hwang et autres

Highly Li-concentrated electrolytes are acknowledged for their compatibility with Li metal negative electrodes and high voltage positive electrodes to achieve high-energy Li metal batteries, showcasing stable and facile interfaces for Li deposition/dissolution and high anodic stability. This study aims to explore a …

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Cover Feature: Use of Ferrocenyl Ni(II) and Zn(II) Porphyrins as Active Organic Electrode Materials for Sodium Secondary Batteries (Batteries & Supercaps 6/2024)

Shaoning Zhang, Jinkwang Hwang, Quan Manh Phung, Kazuhiko Matsumoto et autres

The Cover Feature showcases a practical organic electrode material comprising zinc porphyrin and ferrocene in a single molecule. Its sodium battery exposed a durably reversible 118 mA h g−1 capacity at 200 mA g−1, thereby demonstrating superior rapid electrochemical charge-storage capacity and …

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Dendrite-free Na deposition: Effects of the Na metal state on the deposition/dissolution performance on β”-alumina solid electrolyte interface

Jie Qiu, Di Wang, Jinkwang Hwang, Kazuhiko Matsumoto et autres

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Unprotected Organic Cations─The Dilemma of Highly Li-Concentrated Ionic Liquid Electrolytes

Shaoning Zhang, Shengan Wu, Jinkwang Hwang, Kazuhiko Matsumoto et autres

Highly Li-concentrated electrolytes have been widely studied to harness their uniquely varying bulk and interface properties that arise from their distinctive physicochemical properties and coordination structures. Similar strategies have been applied in the realm of ionic liquid electrolytes to exploit their improved …

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Use of Ferrocenyl Ni(II) and Zn(II) Porphyrins as Active Organic Electrode Materials for Sodium Secondary Batteries

Shaoning Zhang, Jinkwang Hwang, Quan Manh Phung, Kazuhiko Matsumoto et autres

Abstract This study investigates the potential use of ferrocenyl‐substituted porphyrins as organic electrode materials for sodium secondary batteries. Expressly, 5,15‐di(ferrocenyl)‐10,20‐di(pentafluorophenyl)porphyrins (free base, Fc−H2Por), along with its zinc (Zn[II] complex, Fc−ZnPor) and nickel (Ni[II] complex, Fc−NiPor) derivatives were synthesized and employed as the …

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Fluoride Ion in Alcohols: Isopropanol vs Hexafluoroisopropanol

Nozomi Yoneda, H. IYAMA, Takashi Nagata, Masato Katahira et autres

The utility of alcohol as a hydrogen bonding donor is considered a providential avenue for moderating the high basicity and reactivity of the fluoride ion, typically used with large cations. However, the practicality of alcohol–fluoride systems in reactions is hampered by the …

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