Diffusion kinetics in germanium doped lithium titanate anode material through potential sweep analysis

• Published in: Ceramics international Vol. 48; no. 16; pp. 24071 - 24078
• Main Authors: Sreejith, O.V., Ramaswamy, Murugan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.08.2022
• Subjects: Cyclic voltammetry; Diffusion coefficient; Lithium titanate; Lithium-ion battery; Cyclic voltammetry; Lithium-ion battery; Lithium titanate; Diffusion coefficient
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2022.05.087

The inevitable demand for the energy sources for the present world's living has increased the pace of exploration towards developing sustainable and superior performing energy storage devices. Lithium-ion battery technology has been in the front since its invention. The introduction of spinel structured lithium titanate (Li4Ti5O12) as an anode material for lithium-ion batteries led to revolutionary improvements in rate-capability, long cyclability, and safety. The diffusion kinetics studies have been carried out on germanium doped lithium titanate (Li4GexTi5-xO12, x = 0.05, 0.10, 0.15, and 0.20) through cyclic voltammetry analysis. The studies revealed that the lithium-ion kinetics in the lithium titanate has significantly improved the electrochemical performance through germanium incorporation. The lithium-ion diffusion coefficient of Li4Ge0.1Ti4.9O12 (1.12×10−11 cm2 s−1) was found to have one order higher than that of the pristine phase (2.71×10−12 cm2 s−1). This enhancement in the lithium-ion diffusion has pushed the discharge capacity of Li4Ge0.1Ti4.9O12 to 161 mAh g−1 from 145 mAh g−1 at 0.1C rate.