ORCID Profile
0000-0002-4684-5717
Current Organisation
Yokohama National University
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Publisher: Wiley
Date: 29-04-2022
Abstract: Water‐in‐salt electrolytes have been widely explored because of their expanded electrochemical stability ( .0 V). However, the instability of solid‐electrolyte interphase (SEI) in aqueous electrolytes leads to their reductive decomposition on the negative electrodes of low‐potential anode materials. Here, we demonstrate significant improvement in the cycle performance of a Li 4 Ti 5 O 12 electrode using a Li−Ca binary salt hydrate (LCH) electrolyte in combination with an optimized electrochemical pretreatment process. Compared with a hydrate‐melt electrolyte, the LCH electrolyte provided less water‐soluble Ca‐based SEI components, and careful pretreatment process enabled the formation of a thicker SEI layer on the Li 4 Ti 5 O 12 electrode. Protected with the hardly soluble, thick SEI layer, the Li 4 Ti 5 O 12 electrode effectively mitigated unfavorable side reactions and achieved 95.5 % capacity retention over 50 cycles. These results offer insight into a promising route for stable SEI layer formation for the practical use of low‐potential anode materials in aqueous rechargeable lithium‐ion batteries.
Publisher: Elsevier BV
Date: 09-2020
Publisher: American Chemical Society (ACS)
Date: 16-08-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CP04522J
Abstract: Atomic force microscopy (AFM) force measurements have been used to study the solvate ionic liquid (IL) double layer nanostructure at highly ordered pyrolytic graphite (HOPG) and Au(111) electrode surfaces as a function of potential.
Publisher: American Chemical Society (ACS)
Date: 22-03-2023
Publisher: American Chemical Society (ACS)
Date: 13-07-2017
Publisher: American Chemical Society (ACS)
Date: 21-02-2023
Publisher: Wiley
Date: 17-10-2022
Abstract: Since aqueous lithium‐ion batteries (LIBs) were first proposed, electrolyte design has been intensively studied. We report a simple anionic surfactant, i. e., a lithium dodecyl sulfate (LiDS)‐based aqueous electrolyte, capable of enhancing the Li ion transport properties in the bulk and protecting the electrode at the interface. The self‐assembly of DS anions into micelles effectively limited anion diffusion, enabling nearly single Li‐ion conduction in the bulk electrolyte. The interfacial adsorption of DS molecules formed a hydrophobic layer at the electrolyte/electrode interface under the electric field of the electric double layer, excluding water molecules from the interface. Consequently, the electrochemical window of the aqueous electrolyte was expanded to 3.0 V. This electrolyte improved the cycle performance and rate capability of the LiFePO 4 /LiTi 2 (PO 4 ) 3 full‐cell compared to a 1.0 mol dm −3 Li 2 SO 4 /H 2 O reference electrolyte. These results provide a new twist in the design of liquid electrolytes for aqueous LIBs.
Publisher: Wiley
Date: 03-05-2022
Publisher: American Chemical Society (ACS)
Date: 15-04-2022
Abstract: Electrolytes with a high Li-ion transference number (
Publisher: American Chemical Society (ACS)
Date: 18-05-2023
Publisher: The Electrochemical Society of Japan
Date: 05-07-2021
Publisher: American Chemical Society (ACS)
Date: 15-06-2015
DOI: 10.1021/ACS.LANGMUIR.5B01500
Abstract: Atomic force microscope (AFM) force curves and images are used to characterize the adsorbed layer structure formed by a series of diblock copolymers with solvophilic poly(ethylene oxide) (PEO) and solvophobic poly(ethyl glycidyl ether) (PEGE) blocks at silica-water and silica-ethylammoniun nitrate (EAN, a room temperature ionic liquid (IL)) interfaces. The diblock polyethers examined are EGE109EO54, EGE113EO115, and EGE104EO178. These experiments reveal how adsorbed layer structure varies as the length of the EO block varies while the EGE block length is kept approximately constant water is a better solvent for PEO than EAN, so higher curvature structures are found at the interface of silica with water than with EAN. At silica-water interfaces, EGE109EO54 forms a bilayer and EGE113EO115 forms elongated aggregates, while a well-ordered array of spheres is present for EGE104EO178. EGE109EO54 does not adsorb at the silica-EAN interface because the EO chain is too short to compete with the ethylammonium cation for surface adsorption sites. However, EGE113EO115 and EGE104EO178 do adsorb and form a bilayer and elongated aggregates, respectively.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CP00425D
Abstract: The hopping/exchange-dominated Li ion transport is attributed to liquid electrolytes with solvent-bridged, chain-like Li ion coordination and aggregated ion pairs.
Publisher: American Chemical Society (ACS)
Date: 12-03-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CP03414K
Abstract: The structure and interactions of different (lithium salt plus glyme) equimolar mixtures are probed by Molecular Dynamics simulations.
No related grants have been discovered for Kazuhide Ueno.