Kunimitsu Kataoka

Aqueous synthesis of Li2MnAO4/C (A = Si, Ge) as positive electrode active materials for lithium-ion batteries by acid–base reaction† Polyanion-type positive electrode active materials such as LiFePO4 are promising materials for high-safety lithium-ion batteries because of their highly stable anion structure. However, polyanion-based positive electrode active materials with high energy densities and good safety features are more desirable than LiFePO4 at present.

Abstract Garnet-type Li7La3Zr2O12 (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.

Influence of compositing conditions for Si-composite negative electrodes in sulfide-type all-solid-state lithium-ion batteries† Hiroshi Nagata, *a Junji Akimoto a and Kunimitsu Kataoka a Abstract Interparticle contact is crucial for high-performance all-solid-state lithium-ion batteries because it determines charge transfer path formation. However, sulfide electrolytes and Si react under compositing conditions, realizing good interparticle contact.