(421g) Dry Coating of Electrode Particle with Model Particle of Sulfide Solid Electrolytes for All-Solid-State Secondary Battery

We here present a dry coating of electrode particle with a model material of sulfide solid electrolytes for all-solid-state secondary batteries. LiNi1/3Co1/3Mn1/3O2 (NCM) was used as a host particle. Sodium sulfate (Na2SO4) was selected as a model material of sulfide solid electrolytes and used as a guest particle. Three different processes, which were vibration mixing, mortar-and-pestle mixing, and dry impact-blending process known as â??Hybridizerâ?, were used and compared to each other. FESEM and EDX images showed that the dry impact-blending process produced composite particles in which NCM was more fully covered with Na2SO4 than using the vibration mixing and mortar-and-pestle mixing. Cross sectional observations of composite particles showed that using the dry impact-blending process continuous layer of Na2SO4 were formed on NCM particle. In a compacted pellet prepared from the composite particles produced by the dry impact-blending process, following features were observed: better dispersion of NCM particles in Na2SO4 matrix without NCM agglomerates; less void space; and intimate NCM-Na2SO4 interfacial contacts. These features suggest that performance of all-solid-state batteries are likely to remarkably improve using the composite particles prepared from the dry coating process [1].

[1] T. Kawaguchi, H. Nakamura, S. Watano. Powder Technology, in press.