Research Institute for Energy Efficient Technologies, AIST
Our research group conducts comprehensive studies on energy storage technologies to support the large-scale deployment of renewable energy and the realization of carbon neutrality. We address energy storage challenges across multiple application scales, ranging from grid-level stationary systems to mobile applications, by integrating materials science, electrochemical reactions, and system-level evaluation.
We develop next-generation redox flow batteries (RFBs) for large-scale stationary energy storage applications. Our research focuses on the design and synthesis of novel organic redox-active materials, electrolyte formulation for high concentration and long-term stability, and the evaluation of ion-exchange membranes, including non-fluorinated alternatives. We also establish evaluation techniques for kW-class cells and stacks, aiming to achieve high energy density, long cycle life, and cost reduction simultaneously.
For mobile energy storage applications, we conduct research on lithium-ion batteries and all-solid-state batteries with an emphasis on interfacial phenomena between electrodes and electrolytes. Our work includes the investigation of interfacial reactions, degradation mechanisms, and short-circuit behavior, as well as the development of advanced evaluation methods for thermal stability and durability. These studies contribute to the design of high-safety and high-reliability batteries.
We explore electrochemical conversion and storage technologies using CO2 and N2 as feedstocks. Our research includes the development of high-performance electrocatalysts, systematic investigation of reaction mechanisms, and the integration of electrochemical reactions with energy storage functions. We aim to establish novel concepts for direct energy storage systems that convert electrical energy into chemical bond energy and back to electricity.