Low-Temperature Fabrication of Bulk-Type All-Solid-State Lithium-Ion Battery Utilizing Nanosized Garnet Solid Electrolytes.

Garnet-type Li La Zr O (LLZ) materials are attracting attention as solid electrolytes (SEs) in oxide-based all-solid-state batteries (ASSBs) owing to their high ionic conductivity. Although the electrochemical stability of LLZ against Li metal is demonstrated with possible high energy density, high-temperature sintering above 1000 °C, which is required to achieve high Li-ion conductivity, results in the formation of insulating impurities at the electrode-electrolyte interfaces. Here, nanosized fine-particle samples of Ta-substituted Li La Zr Ta O (LLZT) are successfully prepared at a remarkably low temperature of 400 °C utilizing an amorphous precursor oxide.

Low-Temperature Sintering of a Garnet-Type LiLaZrTaO Solid Electrolyte and an All-Solid-State Lithium-Ion Battery.

Garnet-type Ta-substituted LiLaZrO materials attract considerable attention as solid electrolytes for use in future oxide-based all-solid-state lithium-ion batteries owing to their superior ionic conductivity and chemical and electrochemical stabilities. However, high-temperature sintering above 1000 °C, which is needed to realize high lithium-ion conductivity, results in the formation of insulating interface impurities at the electrode-electrolyte interface. Herein, the low-temperature sintering of the LiLaZrTaO (LLZT) solid electrolyte at a remarkably low temperature of 400 °C was demonstrated using the submicrometer-sized garnet-type LLZT fine powder sample prepared at 600 °C through a reaction of LiO and LaZrTaO.

Discovery of the Li-Sr-La-Zr-O Compound and the Investigation of Its Lithium-Ion Conductivity.

Single crystals of LiSrLaZrO, having a new crystal structure, were successfully grown in air using the floating zone crystallization method. The obtained crystals were colorless and had a rectangular shape with a maximum dimension of 8(φ) × 50 mm. The elemental composition of the crystal was determined via energy-dispersive X-ray spectroscopy.

Orthorhombic Crystal System for a Garnet-type Lithium-Ion Conductor.

A single-crystal rod with a composition of LiLaZrNbO was grown using the floating zone method. The single-crystal rod had a diameter of 8 mm and length of 90 mm. LiLaZrNbO crystallizes in an orthorhombic system, with space group , and the single crystal with 0.

Relationship between Li diffusion and ion conduction for single-crystal and powder garnet-type electrolytes studied by Li PGSE NMR spectroscopy.

Ion-conducting garnets are important candidates for use in all-solid Li batteries and numerous materials have been synthesized with high ionic conductivities. For understanding ion conduction mechanisms, knowledge on Li diffusion behaviour is essential. The proposed nano-scale lithium pathways are composed of tortuous and narrow Li channels.

Toward understanding the anomalous Li diffusion in inorganic solid electrolytes by studying a single-crystal garnet of LLZO-Ta by pulsed-gradient spin-echo nuclear magnetic resonance spectroscopy.

Li diffusion was observed by Li nuclear magnetic resonance (NMR) spectroscopy in three single-crystal samples of LLZO-Ta (LiLaZrTaO) grown by the floating zone melting method as well as a crushed sample in this study. Previously, the pulsed-gradient spin-echo Li NMR method was applied to Li diffusion measurements in inorganic solid electrolyte powder samples. Anomalous Li diffusion behaviors were observed such as dependence of the observing time (Δ) and pulsed-field-gradient strength (g), and the diffusive-diffraction patterns in short Δ in the echo-attenuation plots.

Lithium-ion conducting oxide single crystal as solid electrolyte for advanced lithium battery application.

Today, all-solid-state secondary lithium-ion batteries have attracted attention in research and development all over the world as a next-generation energy storage device. A key material for the all-solid-state lithium batteries is inorganic solid electrolyte, including oxide and sulfide materials. Among the oxide electrolytes, garnet-type oxide exhibits the highest lithium-ion conductivity and a wide electrochemical potential window.

Quantitative analysis of cation mixing and local valence states in LiNixMn2-xO4 using concurrent HARECXS and HARECES measurements.

Cation mixing in positive electrode materials for rechargeable lithium ion batteries, LiNixMn2-xO4 (x = 0, 0.2, 0.5) and Li0.

Crystal structure and superconductivity of BaIr₂Ge₇ and Ba₃Ir₄Ge₁₆ with two-dimensional Ba-Ge networks.

The Ba-Ir-Ge ternary compounds BaIr2Ge7 and Ba3Ir4Ge16 exhibit superconductivity (SC) at 2.5 and 5.2 K, respectively.

A new layered iron arsenide superconductor: (Ca,Pr)FeAs2.

A new iron-based superconductor, (Ca,Pr)FeAs2, was discovered. Plate-like crystals of the new phase were obtained, and its crystal structure was investigated by single-crystal X-ray diffraction analysis. The structure was identified as the monoclinic system with space group P2₁/m, composed of two Ca(Pr) planes, Fe2As2 layers, and As2 zigzag chain layers.

Ion-exchange synthesis, crystal structure, and physical properties of hydrogen titanium oxide H2Ti3O7.

Hydrogen titanium oxide H2Ti3O7 was prepared from Na2Ti3O7 as a parent compound via Na(+)/H(+) ion exchange in acidic solution at 333 K. It crystallizes in the monoclinic system, space group C2/m, and the lattice parameters of a = 16.0380(8) Å, b = 3.