Structure and Electrochemical Properties of Li 4 Ti 5 O 12 Prepared via Low-Temperature Precipitation

• Published in: Journal of chemistry 2019-08, Vol.2019, p.1-7
• Main Authors: Huynh, Le Thanh Nguyen, Ha, Cam Thanh Duy, Nguyen, Viet Dung, Nguyen, Dinh Quan, Le, My Loan Phung, Man Tran, Van
• Format: Article
• Language: English
• ISSN: 2090-9063; 2090-9071
• DOI: 10.1155/2019/1727859

This work aimed to prepare the spinel phase Li 4 Ti 5 O 12 by a combination of the low-temperature precipitation technique and assisted calcination step. X-ray diffraction (XRD) revealed that the intermediated phase was Li 2 TiO 3 , and the spinel phase could be evidently formed at 700°C for 12 to 20 hours. The morphology of spinel powder, determined by SEM and TEM, exhibited a good distribution at the submicrometric scale that promoted a fast kinetic of Li migration and an excellent performance at the high-rate cycling test. The stable performances were achieved in the charge-discharge test at different current densities: 80 mA/g (165 mAh/g), 320 mA (160 mAh/g), and 1600 mA (145 mAh/g) upon 100 cycles. Moreover, we observe a capacity retention of 48% (corresponding 80 mA/g) at a high rate of 5000 mAh/g. The cyclic voltammetry measurement displayed a reversible system and revealed the lithium diffusion coefficient of 1.15 × 10 −11  cm 2 /s.