| Ionic conductivity and microstructural characteristics of NASICON-type solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 affected by synthesis and manufacturing processes for all solid-state battery |
Chan Gyu Kim1, Yu Taek Hong1, Ji Min Im1, Ki Sang Baek1, Yu Ri Lim1, Hwa-Jung Kim2, Hyeokjun Park2, Seung-Wook Baek2, Jung Hyun Kim1
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1Department of Advanced Materials Science and Engineering, Hanbat National University, 125, Dongseo-Daero, Yuseong-Gu, Daejeon, 34158, Republic of Korea
2Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science (KRISS), Gajeong-Ro 267, Yuseong-Gu, Daejeon, 34113, Republic of Korea |
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Received: March 11, 2024; Revised: June 9, 2024 Accepted: July 5, 2024. Published online: July 16, 2024. |
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| ABSTRACT |
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This study investigated the synthesis properties of Li103Al0.3Ti1.7(PO4)3 (LATP) with respect to heat treatment, and analyzed the ion conductivity properties in relation to the fabrication methods. The LATP powders (LATP_600 and LATP_700) calcined at 600 and 700 °C showed various secondary phases such as LiTiPO5 and AlPO4 along with the LATP phase. However, calcination at 800 °C for 2 h (LATP_800) resulted in the formation of only the LATP phase. When sintering at the same temperature (800 °C) after various calcination temperatures, LiTiPO5 did not occur in LATP_600–800, but did occur in LATP_700–800 and LATP_800–800. The ion conductivity characteristics of the LATP prepared by compression molding and tape casting methods revealed that the pellet LATP_800–800 and tape LATP_800–800 showed excellent total ion conductivity values of 7.7 × 10-4 S/cm and 9.7 × 10-4 S/cm at 25 °C. Specimens produced by compression molding showed abnormal grain growth (AGG), while those produced by tape casting exhibited a dense grain structure with suppressed AGG. Therefore, changing the specimen production method from compression molding to tape casting improved both the ion conductivity and microstructural properties of the synthesized LATP. |
| Key words:
Solid electrolyte · LATP · Microstructure · Abnormal grain growth · Ionic conductivity |
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