期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 12, 页码 12517-12524出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c02474
关键词
solid electrolyte; garnet; ionic conductivity; Li dendrite; postannealing
资金
- Japan Society for the Promotion of Science (JSPS) [16KK0127, 19H02128]
- Cooperative Research Facility Center at the Toyohashi University of Technology
- JSPS KAKENHI [16KK0127]
- Grants-in-Aid for Scientific Research [19H02128, 16KK0127] Funding Source: KAKEN
In 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 degrees 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.
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