Enhancing the Performance of All-Solid-State Energy Storage Devices via Interfacial Reaction Analysis of Ion Storage and Ion Conduction Materials
Year: 2026
Type: article
Abstract: All-solid-state batteries are promising next-generation energy-storage devices because they can offer improved safety and high energy density. However, their performance depends not only on the intrinsic properties of ion-storage materials (electrode active materials) and ion-conduction materials (solid electrolytes) but also on reactions at the resulting solid–solid interfaces. Accordingly, understanding and controlling these interfaces are critical to achieving high-performance all-solid-state batteries. Here, interfacial phenomena are examined from two complementary perspectives: interface control in practical powder-based all-solid-state batteries and fundamental analysis of interfacial reactions in model thin-film batteries. For practical powder-based systems, sulfide solid electrolytes, including Li7P2S8I, Li6PS5Cl, and Li10GeP2S12, were prepared by liquid-phase synthesis. Combined structural, spectroscopic, and electrochemical analyses showed that the synthesis route altered particle-surface chemistry, grain-boundary ion transport, composite-electrode microstructure, and, consequently, battery performance. Complementary model thin-film batteries were used to isolate and elucidate reactions at well-defined electrode/solid-electrolyte interfaces. Li2MnO3 showed markedly different electrochemical behavior in the all-solid-state configuration than in conventional liquid-electrolyte cells. Synchrotron in situ X-ray diffraction resolved the structural evolution accompanying reversible charge–discharge reactions, whereas operando hard X-ray photoelectron spectroscopy revealed reversible oxygen redox together with dynamic evolution of the electronic structure and band alignment during battery operation. Together, these results establish a framework that connects interface design in practical battery systems with mechanistic understanding of interfacial reactions derived from model systems. This interface-centered approach provides a basis for the rational design of higher-performance all-solid-state energy-storage devices.
Source: Electrochemistry
Author: Kazuhiro HIKIMA
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,130
OpenAlex ID: W7214346734