Ionic conductivity enhancement at phase boundaries achieved by two-phase coexistence of spinel and rock salt structures: mimetics for the anode material Li4Ti5O12
Source abstract
Abstract
Oxide solid electrolytes with high Li-ion conductivity are necessary for the realization of highly safe all-solid-state Li-ion batteries. Although oxide materials have been extensively investigated, no material with sufficient properties as a solid electrolyte has yet been achieved. Therefore, enhancing ionic conductivity in solid materials remains an important challenge. In this study, two-phase coexistence ceramics were prepared to mimic the conductivity enhancement observed in the anode material Li4Ti5O12 with spinel and rock salt structures using Li-containing insulating materials. LiFe5O8 and Li3NbO4 are used as model spinel and rock salt-related structures, respectively. A two-phase separated dense ceramic was successfully prepared by using a conventional solid-state reaction. AC impedance measurements revealed a single semicircle component at room temperature, indicating ionic conductivity enhancement induced by two-phase coexistence. The ceramics with two-phase coexistence showed a conductivity on the order of 10−7 S/cm, about nine orders of magnitude higher than that of pure LiFe5O8 or Li3NbO4. These results suggest that the conductivity enhancement can be interpreted as mimetic to that observed in Li4Ti5O12.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advancements in Solid Oxide Fuel Cells
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials and Chemical Technology, Institute of Science Tokyo
References (48)
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