Ryoji Kanno

The new crystalline material family, lithium superionic conductor (thio-LISICON), was found in the system. The solid solution member in shows the highest conductivity of at 25°C of any sintered ceramic, together with negligible electronic conductivity, high electrochemical stability, no reaction with lithium metal, and no phase transition up to 500°C. Its material design concepts of changing constituent ions with various ionic radii, valence, and polarizability are described. © 2001 The Electroc

No design rules have yet been established for producing solid electrolytes with a lithium-ion conductivity high enough to replace liquid electrolytes and expand the performance and battery configuration limits of current lithium ion batteries. Taking advantage of the properties of high-entropy materials, we have designed a highly ion-conductive solid electrolyte by increasing the compositional complexity of a known lithium superionic conductor to eliminate ion migration barriers while maintainin

A variety of proton (H(+))-conducting oxides are known, including those used in electrochemical devices such as fuel cells. In contrast, pure H(-) conduction, not mixed with electron conduction, has not been demonstrated for oxide-based materials. Considering that hydride ions have an ionic size appropriate for fast transport and also a strong reducing ability suitable for high-energy storage and conversion devices, we prepared a series of K2NiF4-type oxyhydrides, La(2-x-y)Sr(x + y)LiH(1-x + y)O

Abstract Ever since the first report on Li 10 GeP 2 S 12 (LGPS) in 2011, its unique structure and exceptionally high lithium conductivity (>1 × 10 −2 S cm −1 ) have attracted extensive interest, especially for applications in solid‐state ionics and batteries. Herein, studies of LGPS and its modifications are reviewed with a focus on the synthesis, structure, and ionic transportation of LGPS. For material synthesis, the relationships between LGPS and its precursor compounds such as Li 3 PS 4 a

The lithium diffusion pathway in the LGPS structure visualized through MEM analysis assisted in elucidating the conductivity pathway changes with temperature.

A new lithium iron oxide, , with a corrugated layer structure was synthesized by an ion exchange reaction between γ‐FeOOH and and its structure determined by x‐ray and neutron diffraction measurements. The ion exchange reaction was carried out hydrothermally at 100 to 250°C. Higher vapor pressures produce the disordered phase, and higher reaction temperatures lead to a mixture of the disordered spinel phase, , and the new phase. Lithium cells consisting of cathodes and lithium anodes showed good