Investigation of Chemical and Thermal Stability of Li7−xLa3Zr2−xTaxO12 Garnet Type Solid-State Electrolyte to Assemble Self-Standing Li-based All Solid-State Battery - Archive ouverte HAL Access content directly
Journal Articles Energy Technology Year : 2023

Investigation of Chemical and Thermal Stability of Li7−xLa3Zr2−xTaxO12 Garnet Type Solid-State Electrolyte to Assemble Self-Standing Li-based All Solid-State Battery

Abstract

All solid-state batteries (ASSB) are the next generation of safe and high-energy-density energy storage technology. Their development is currently impeded by the stability issues of solid-state electrolyte (SSE) limiting the creation of interfaces of quality high enough to ensure efficient transfer of charges. The garnet Li7−xLa3Zr2−xTaxO12 (LLZO:Ta) is one of the most appealing oxide-based SSE but its high sensitivity to moist air engenders difficulties in designing process to densify and assemble components of the ASSB. Based on a careful investigation of LLZO:Ta thermal and chemical stability, a heat treatment is designed and shown to fully reverse the protonation process. The investigation of spark plasma sintering protocols confirms that pretreated LLZO:Ta can be densified at a temperature as low as 850 °C or with a short duration (few seconds) at 900 °C. The characterization of obtained ceramics shows conductivities close to the bulk properties and confirms the absence of influence of grain boundaries. The study of composite electrodes shows that LLZO:Ta is suitable to act both as SSE separator and ionic percolator in positive electrode, the selection of active material remains the main issue to target self-standing Li-based ASSB.
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Origin : Publication funded by an institution
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hal-04119284 , version 1 (06-06-2023)

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Ghassen Charrad, Sarah Pradeilles, Romain Berthelot, P.-L. Taberna, Patrice Simon, et al.. Investigation of Chemical and Thermal Stability of Li7−xLa3Zr2−xTaxO12 Garnet Type Solid-State Electrolyte to Assemble Self-Standing Li-based All Solid-State Battery. Energy Technology, 2023, ⟨10.1002/ente.202300234⟩. ⟨hal-04119284⟩
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