New & Renewable Energy (신재생에너지)

Korean Society for New and Renewable Energy (한국신·재생에너지학회)
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Effect of Calcination Temperature on Ionic Conductivity of All-solid State Battery Electrolytes

하소 온도가 전고체 전지 전해질의 이온전도도에 미치는 영향

  • Yu Taek Hong (Department of Advanced materials Science and Engineering, Hanbat National University) ;
  • Ji Min Im (Department of Advanced materials Science and Engineering, Hanbat National University) ;
  • Ki Sang Baek (Department of Advanced materials Science and Engineering, Hanbat National University) ;
  • Chan Gyu Kim (Department of Advanced materials Science and Engineering, Hanbat National University) ;
  • Seung Wook Baek (Interdisciplinary Materials Measurement Institue, Korea Research Institute of Standards and Science (KRISS)) ;
  • Jung Hyun Kim (Department of Advanced materials Science and Engineering, Hanbat National University)
  • Received : 2024.02.15
  • Accepted : 2024.03.20
  • Published : 2024.06.25
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Abstract

In this study, the electrochemical properties of garnet-structured all-solid-state battery electrolytes (Li6.4La3Zr1.4Ta0.6O12, hereafter LLZTO) were assessed by altering the calcination temperature, while maintaining a consistent sintering duration. Among the various heat treatment conditions employed for sample fabrication, the '700_1100' condition, denoting a calcination temperature of 700℃ and a sintering temperature of 1100℃, resulted in the most exceptional ionic conductivity of 4.89 × 10-4 S/cm and a relative density of 88.72% for the LLZTO material. This is attributed to the low calcination temperature of 700℃, leading to reduced grain size and enhanced cohesiveness, thus resulting in a higher sintered density. In addition, a microstructure similar to the typical sintering characteristics observed in Spark Plasma Sintering (SPS) methods was identified in the SEM analysis results under the '700_1100' condition. Consequently, the '700_1100' heat treatment condition was deemed to optimal choice for enhancing ionic conductivity.

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