Saneyuki Ohno

Abstract All-solid-state batteries, employing inorganic ion conductors as electrolytes, can surpass the current Li-ion technology in terms of energy density, battery safety, specific power, as well as a fast-charging capability; however, a highly conductive solid electrolyte is essential. While recent extensive explorations of solid ion conductors have led to a list of candidate materials, there are still enormous variations of the ionic conductivity even within the same class of the materials,

Because of a remarkably high theoretical energy density, the lithium–sulfur (Li–S) battery has attracted significant attention as a candidate for next-generation batteries. While employing solid electrolytes can provide a new avenue for high-capacity Li–S cells, all-solid-state batteries have unique failure mechanisms such as chemomechanical failure due to the volume changes of active materials. In this study, we investigate all-solid-state Li–S model cells with differently processed cathode com

How Certain Are the Reported Ionic Conductivities\nof Thiophosphate-Based Solid Electrolytes? An Interlaboratory Study

Abstract Solid‐state lithium‐sulfur batteries (SSLSBs) have the potential to cause a paradigm shift in energy storage. The use of emerging highly‐conductive solid electrolytes enables high energy and power densities. However, the need for an intimate mixture of electrolyte and conductive additives to compensate for the insulating nature of cathode active materials S 8 and Li 2 S induces intense electrolyte degradation. Thus, it is paramount to understand better the electrochemical and transport

All-solid-state batteries are promising candidates for next-generation energy-storage devices. Although the list of candidate materials for solid electrolytes has grown in the past decade, there are still many open questions concerning the mechanisms behind ionic migration in materials. In particular, the lithium thiophosphate family of materials has shown very promising properties for solid-state battery applications. Recently, the Ge-substituted Li6PS5I argyrodite was shown to be a very fast L

Complex multinary compounds (ternary, quaternary, and higher) offer countless opportunities for discovering new semiconductors for applications such as photovoltaics and thermoelectrics. However, controlling doping has been a major challenge in complex semiconductors as there are many possibilities for charged intrinsic defects (e.g., vacancies, interstitials, antisite defects) whose energy depends on competing impurity phases. Even in compounds with no apparent deviation from a stoichiometric n

ConspectusThe energy density of the ubiquitous lithium-ion batteries is rapidly approaching its theoretical limit. To go beyond, a promising strategy is the replacement of conventional intercalation-type materials with conversion-type materials possessing substantially higher capacities. Among the conversion-type cathode materials, sulfur constitutes a cost-effective and earth-abundant element with a high theoretical capacity that has a potential to be game-changing, especially within an emergin

Abstract The exploitation of high‐capacity conversion‐type materials such as sulfur in solid‐state secondary batteries is a dream combination for achieving improved battery safety and high energy density in the push toward a sustainable future. However, the exact reason behind the low rate‐capability, bottlenecking further development of solid‐state lithium–sulfur batteries, has not yet been determined. Here, using neutron imaging, the spatial distribution of lithium during cell operation is dir

The electronic mobility in the Zintl phase Yb₉Mn_4.2Sb₉can be improved by substituting Zn on the Mn site, leading to an improved thermoelectric quality factor.

Highly conductive solid electrolytes (SEs) are a prerequisite for developing all-solid-state batteries. Recently, Li-ion conducting halide-based SEs have attracted enormous attention owing to their electrochemical, mechanical, and transport properties. Despite the success of Li-ion conducting halides, the research on the Na analogue remains sparse, and the reported ionic conductivities are limited. In this study, we demonstrate the significantly improved ionic conductivity in NaM5+Cl6 (M5+ = Nb,

The ability to reproducibly synthesize highly conductive solid electrolytes (SEs) is a prerequisite for the widespread usage of solid-state batteries. However, reported ionic conductivities of SEs exhibit significant variation even in materials with the same nominal composition. In this study, the thermodynamic origin of such sample-dependent variations is discussed using sodium-ion conducting Na3SbS4 as a model SE. The impact of uncontrolled variations in elemental chemical potentials on the io

The utilization of earth-abundant and high-capacity sulfur in solid-state batteries presents a promising strategy to circumvent the use of rare transition metals and enhance achievable specific energy. However, numerous challenges remain. The transport limitation within the cathode composite, particularly with sulfide electrolytes during charging, has been identified as a major degradation mechanism in solid-state Li–S batteries. This degradation is linked to electrolyte oxidation and a concomit

<p>Owing to a remarkably high theoretical energy density, the lithium-sulfur (Li-S) battery has attracted significant attention as a candidate for next-generation batteries. While employing solid electrolytes can provide a new avenue for high capacity Li-S cells, all-solid-state batteries have unique failure mechanisms such as chemo-mechanical failure due to the volume changes of active materials. In this study, we investigate all-solid-state Li-S model cells with differently processed cat