Tunnel-Structured Phosphate Exhibiting High Proton Conductivity and Thermal Stability over a Wide Intermediate Temperature Range.

For the practical application of fuel cells in vehicles, it is a challenge to develop a proton solid electrolyte that coexhibits thermal stability and high proton conductivity at wide intermediate temperatures. Here, we report on the tunnel structured phosphate KNiH(PO)HO, which exhibits high proton conductivity at room temperature up to 500 °C, with the conductivity value reaching 1.7 × 10 S cm at 275 °C for = 0.

Flexible High Lithium-Ion Conducting PEO-Based Solid Polymer Electrolyte with Liquid Plasticizers for High Performance Solid-State Lithium Batteries.

Lithium-ion secondary batteries (LIB) with high energy density have attracted much attention for electric vehicle (EV) applications. However, LIBs have a safety problem because these batteries contain a flammable organic electrolyte. As such, all-solid secondary batteries that are not flammable have been extensively reported recently.

Mechanistic study of AlO coating effects on lithium deposition and dissolution reaction.

Lithium metal anodes show great promise for use in next-generation secondary batteries, but they suffer from lithium dendrite growth, as well as other issues, which cause safety problems and result in a loss of capacity with time. The use of artificial inorganic solid electrolyte interphase (SEI) layers, such as those comprising AlO, is a promising way to mitigate these disadvantages, but the mechanism behind these observed improvements remains poorly understood. Therefore, in this study, using pulsed laser deposition (PLD), the surface of a Cu electrode was coated with a physicochemically stable and mechanically strong AlO thin film, and the effects of the film coating on the lithium deposition and dissolution behaviour were investigated.

Proton conductivity in mixed cation phosphate, KMgH(PO)·HO, with a layered structure at low-intermediate temperatures.

Proton solid electrolytes, which exhibit high proton conductivity at a wide range of low-intermediate temperatures (150-300 °C), are key materials for the development of fuel cells for automobiles and cogeneration systems. In this study, a benitoite-type polyphosphate, KMg1-xH2x(PO3)·yH2O, which has a non-combustible and layered structure, was investigated as a new proton conductor. The benitoite-type KMg1-xH2x(PO3)·yH2O was synthesised by a coprecipitation method.

Reactions of the LiMnO Cathode in an All-Solid-State Thin-Film Battery during Cycling.

We evaluated the structural change of the cathode material LiMnO that was deposited as an epitaxial film with an (001) orientation in an all-solid-state battery. We developed an surface X-ray diffraction (XRD) technique, where X-rays are incident at a very low grazing angle of 0.1°.

Lithium metal deposition/dissolution under uniaxial pressure with high-rigidity layered polyethylene separator.

The effects of mechanical uniaxial pressure and deflection of the separator on the electrochemical deposition of lithium metal were investigated. Instead of dendritic lithium growth without pressure, a much more dense and compact deposition can be achieved when pressure is applied to the cells during the lithium deposition process. This morphology is due to the formation of granular lithium followed by the generation of new lithium nuclei on the cathode surface.

A hydrated strontium cobalt oxyhydroxide Ruddlesden-Popper phase as an oxygen electrocatalyst for aqueous lithium-oxygen rechargeable batteries.

This study investigates oxygen electrocatalytic activities of perovskite-related compounds using a rotating disk electrode technique in an aqueous solution containing lithium chloride and lithium hydroxide. A hydrated oxyhydroxide Ruddelesden-Popper phase, SrCoO(OH)·2HO, exhibits excellent performance especially in the oxygen evolution reaction.

Real-time observations of lithium battery reactions-operando neutron diffraction analysis during practical operation.

Among the energy storage devices for applications in electric vehicles and stationary uses, lithium batteries typically deliver high performance. However, there is still a missing link between the engineering developments for large-scale batteries and the fundamental science of each battery component. Elucidating reaction mechanisms under practical operation is crucial for future battery technology.

Structure-property relationships in lithium superionic conductors having a Li10GeP2S12-type structure.

The crystal structures of the superionic conductors Li9.81Sn0.81P2.

Epitaxial growth and lithium ion conductivity of lithium-oxide garnet for an all solid-state battery electrolyte.

Epitaxial thin films of Al-doped Li7La3Zr2O12 (LLZO) with a cubic garnet-type structure were successfully synthesized using pulsed laser deposition to investigate the lithium ion conduction in grains. Two orientations of the films were obtained depending on the Gd3Ga5O12 (GGG) substrate orientation, LLZO(001)/GGG(001) and LLZO(111)/GGG(111). The ionic conductivities in the grains of the (001) and (111) films were 2.