Synergistic Effect of Calcination and Sintering on the Reduction of Grain Boundary Resistance of LATP Solid Electrolyte
- Authors
- Park, ChanJoo; Na, Sungmin; Park, Hyun Gyu; Park, Kwangjin
- Issue Date
- May-2023
- Publisher
- AMER CHEMICAL SOC
- Keywords
- lithium-ion batteries; all solid-state batteries (ASSBs); lithium aluminumtitanium phosphate (LATP); crystallinity; grainboundary
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.15, no.22, pp.26985 - 26992
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 15
- Number
- 22
- Start Page
- 26985
- End Page
- 26992
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/88235
- DOI
- 10.1021/acsami.3c04230
- ISSN
- 1944-8244
- Abstract
- The NASICON-type Li1.4Al0.4Ti1.6(PO4)(3) (LATP)solid electrolyte isa promisingcandidate for next-generation lithium-ion batteries due to its highstability in air and moisture, as well as high bulk ion conductivity.However, the grain boundary resistance of LATP limits its overallionic conductivity, which remains a major obstacle to the commercializationof all-solid-state batteries. In this study, we made efforts to solvethe problem by promoting the minimization of voids and the formationof well-defined grain boundaries by controlling the temperature oftwo heat treatments during the synthesis process. The crystallizationtemperature was confirmed through thermogravimetric analysis/DTA analysis,and the degree of crystallization was confirmed using XRD analysis.The formation of grain boundaries and the presence of voids were evaluatedby cross-sectional SEM images after sintering. After sintering, theLA_900 degrees C sample, characterized by a high degree of crystallizationand well-formed grain boundaries without voids, demonstrated a lowbulk and grain boundary resistance, which was confirmed by electrochemicalimpedance spectroscopy analysis. The result was an ionic conductivityof 1.72 x 10(-4) S/cm. These results providevaluable insights into the facile synthesis of LATP.
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