A thick film of Li7La3Zr2O12 (LLZO) solid-state electrolyte is fabricated using the tape casting process and is compared to a bulk specimen in terms of the density, microstructure, and ion conductivity. The final thickness of LLZO film after sintering is 240 μm which is stacked up with four sheets of LLZO green films including polymeric binders. The relative density of the LLZO film is 83%, which is almost the same as that of the bulk specimen. The ion conductivity of a LLZO thick film is 2.81 × 10−4 S/cm, which is also similar to that of the bulk specimen, 2.54 × 10−4 S/ cm. However, the microstructure shows a large difference in the grain size between the thick film and the bulk specimen. Although the grain boundary area is different between the thick film and the bulk specimen, the fact that both the ion conductivities are very similar means that no secondary phase exists at the grain boundary, which is thought to originate from nonstoichiometry or contamination.

Abstract
 1. 서 론
 2. 실험 방법
 3. 결과 및 토론
 4. 결 론
 References

• 신란희(한국세라믹기술원 이천분원 엔지니어링세라믹센터) | Ran-Hee Shin (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology(Icheon))
• 손삼익(현대기아자동차 환경에너지연구팀) | Samick Son (Environment & Energy Research Team, Automotive Research & Development Division, Hyundai Motor Group)
• 류성수(한국세라믹기술원 이천분원 엔지니어링세라믹센터) | Sung-Soo Ryu (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology(Icheon))
• 김형태(한국세라믹기술원 이천분원 엔지니어링세라믹센터) | Hyung-Tae Kim (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology(Icheon))
• 한윤수(한국세라믹기술원 이천분원 엔지니어링세라믹센터) Corresponding Author