Effect of clay-based amorphous silica on structural and electrical properties of LISICON-type ceramic electrolytes, Li4SiO4

• 发表在: IONICS
• Main Authors: Adnan, S. B. R. S.; Zainal, N.; Mustaffa, N. A.
• 格式: Article; Early Access
• 语言: English
• 出版: SPRINGER HEIDELBERG 2025
• 主题: Chemistry; Electrochemistry; Physics
• 在线阅读: https://www-webofscience-com.uitm.idm.oclc.org/wos/woscc/full-record/WOS:001441597800001
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-025-06205-4

LISICON-type materials are an important class of solid-state electrolytes due to their high ionic conductivity along with decent chemical and electrochemical stability. In this study, Li4SiO4 using synthetic silica and amorphous silica extracted from halloysite clay were synthesized by sol gel method. X-ray diffraction analysis revealed the crystal phase, structure, and unit cell parameters of each electrolyte. Additionally, laser particle sizing determined the distribution of particle sizes, while energy-dispersive X-ray spectroscopy confirmed the elemental composition of both materials. Complex impedance spectroscopy, conducted between 10 and 107 Hz at temperatures ranging from room temperature to 500 degrees C, assessed the electrical properties of the electrolytes. Both types exhibited a monoclinic unit cell structure within the P21/m space group. Interestingly, the amorphous silica-based Li4SiO4 sample possessed a smaller particle size compared to the synthetic one. EDX analysis confirmed that the chemical compositions of both materials closely matched their intended formulations. The amorphous silica-based Li4SiO4 displayed 2.56 times higher total conductivity (4.61 x 10-5 S cm-1) than that of synthetic silica-based Li4SiO4 at 500 degrees C with bulk and grain boundary activation energy of 0.13 eV and 0.16 eV respectively at high temperature. Analysis of the conductivity-frequency spectra allowed estimation of the ionic hopping rate within the structures and found that the enhanced conductivity of the clay-based Li4SiO4 is attributed to higher mobile concentration compared to synthetic Li4SiO4.