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Effect of Postannealing on the Properties of a Ta-Doped Li7La3Zr2O12 Solid Electrolyte Degraded by Li Dendrite Penetration
Get PDFIn this study, we investigated the effect of postannealing on the properties of a garnet-type Ta-doped Li6.55La3Zr1.55Ta0.45O12 (Ta-LLZO) ceramic solid electrolyte degraded by lithium (Li) dendrite penetration during electrochemical Li plating and stripping testing in a Li/Ta-LLZO/Li symmetric cell. After the electrochemical testing in the symmetric cell, the Ta-LLZO pellet was taken out of the cell and then annealed at 800 or 900 °C for 4 h in air. It was confirmed that locally discolored spots on the Ta-LLZO surface at which Li dendrite penetrated disappeared after postannealing. The total conductivity of the annealed Ta-LLZO pellet was lower than the initial one but was retained above 10–4 S cm–1 at room temperature. When the soft-shorted or degraded area size by Li dendrite penetration is localized and smaller than the area size for Ta-LLZO, it is expected that the degradation of the conductivity of annealed Ta-LLZO becomes smaller. Obtained electrochemical results indicate the possibility of reusing the degraded garnet-type solid electrolyte by Li dendrite penetration in another all-solid-state Li battery.journal articl
Tolerance for Li dendrite penetration in Ta-doped Li7La3Zr2O12 solid electrolytes sintered with Li2.3C0.7B0.3O3 additive
Get PDFWe fabricated garnet-type Ta-doped Li7La3Zr2O12 (LLZTO) / Li2.3C0.7B0.3O3 (LCBO) composite ceramic solid electrolytes. By adding the appropriate amount of LCBO to LLZTO, composite solid electrolytes were densified by sintering at 1000ºC without covering the pellet with LLZTO mother powder. LLZTO/LCBO Composites with LCBO volume contents of 20 and 50% showed the ionic conductivity well above 1 x 10-4 S cm-1 at room temperature. Li plating and stripping property for LLZTO/LCBO composites was evaluated using symmetric cells with Li metal electrodes at room temperature. As results, a symmetric cell composed of composite solid electrolyte with low LCBO volume content was stably cycled at the current density up to 0.3 mA cm-2, but increasing the amount of LCBO significantly lowered the current density where the Li dendrite penetration in solid electrolyte occurs. This indicates that LCBO addition is effective for lowering the sintering temperature of LLZTO but the smaller LCBO content is prefer to maintain the tolerance for Li dendrite penetration at high current density.journal articl
TenSense－A Family of Wireless Sensor Nodes Dedicated for Remote Unattended Structural Health Monitoring of Bolted Joints
No full text豊橋技術科学大学博士(工学)doctoral thesi
Effectiveness of Inducing the Sense of Body Ownership over Un-humanoid Avatar for Flying Tele-Existence
Get PDF豊橋技術科学大学博士(工学)doctoral thesi
Quantitative Evaluation Method for Sediment Flow on Seabed Around Structures Subjected to Wave Loading
Get PDF豊橋技術科学大学博士(工学)doctoral thesi
