High Lithium Storage Performance of Co Ion-Doped Li4Ti5O12 Induced by Fast Charge Transport

• Published in: Frontiers in chemistry Vol. 10; p. 919552
• Main Authors: Wang, M., Chen, Y., Yang, C. X., Zeng, Y. H., Fang, P. F., Wang, W., Wang, X. L.
• Format: Journal Article
• Language: English
• Published: Frontiers Media S.A 28.06.2022
• Subjects: charge transport; Chemistry; Li4Ti5O12; lithium storage performance; metallic ion doping; the microstructure
• ISSN: 2296-2646; 2296-2646
• DOI: 10.3389/fchem.2022.919552

In this study, Co 3 O 4 -doped Li 4 Ti 5 O 12 (LTO) composite was designed and synthesized by the hydrothermal reduction method and metal doping modification method. The microstructure and electrochemical performance of the Co 3 O 4 -doped Li 4 Ti 5 O 12 composite were characterized by XRD, SEM, TEM, electrochemical impedance spectroscopy, and galvanostatic tests. The results showed that Li 4 Ti 5 O 12 particles attached to lamellar Co 3 O 4 constituted a heterostructure and Co ion doped into Li 4 Ti 5 O 12 lattice. This Co ion-doped microstructure improved the charge transportability of Li 4 Ti 5 O 12 and inhibited the gas evolution behavior of Li 4 Ti 5 O 12 , which enhanced the lithium storage performance. After 20 cycles, the discharge specific capacity reached stability, and the capacity retention maintained 99% after 1,000 cycles at 0.1 A/g (compared to the capacity at the 20th cycle). It had an excellent rate performance and long cycle stability, in which the capacity reached 174.6 mA h/g, 2.2 times higher than that of Li 4 Ti 5 O 12  at 5 A/g.