Microstructural and electrical properties of Mg substituted Li4Ti5O12 synthesized by ceramic method

• Main Authors: Babu, B. Vikram, Reddi, M. Sushma, Chandana, G., Krishna, A. Rama, Praveena, N. Gna na, Rao, V. Kondala, Wegayehu, M. Tulu, Suresh, J., Trinadh, B., Samatha, K., Veeraiah, V.
• Format: Conference Proceeding
• Language: English
• Subjects: Ambient temperature; Anodes; Chemical analysis; Crystal structure; Electrical impedance; Electrical properties; Electrical resistivity; Electrode materials; Grain size; Lithium-ion batteries; Magnesium; Morphology; Rechargeable batteries; Spinel; Synthesis; Tetrahedra; X-ray diffraction
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0019597

In this paper the effect of magnesium (Mg) substitution in lithium (Li) site of spinel lithium titanate (Li4Ti5O12, LTO) based materials for anodes of Li-ion batteries (LIBs) is extensively studied. The anode materials based on the formula Li4-xMgxTi5O12(x=0 and 0.2) are synthesized using conventional ceramic route at 850° C for 16h. Their phase formation processes, crystal structures, morphology, elemental analysis, cation distribution and electrical properties were studied using XRD, SEM, EDX, FT-IR and CIS characterization techniques. The XRD studies revealed the exact structure of the material which belonged to cubic spinel structure as part of the space group Fd-3m. The morphological characteristics related to phase and grain size allocation were found using SEM and the grain size was found to be in the range 0.9-1.1 µm. The FT-IR results revealed the oxide lattice structure built of MO6 (M= Li, Mg and Ti) as tetrahedra and octahedra. The electrical impedance studies showed the material (Li3.8Mg0.2Ti5O12) to exhibit excellent conductivity which was found to be 3.8×10−5 S/cm at ambient temperature for frequency ranging from 20 Hz to 1MHz.