AUTHOR=Wang M. , Chen Y. , Yang C. X. , Zeng Y. H. , Fang P. F. , Wang W. , Wang X. L. 

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

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.919552

DOI=10.3389/fchem.2022.919552

ISSN=2296-2646

ABSTRACT=<p>In this study, Co<sub>3</sub>O<sub>4</sub>-doped Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> (LTO) composite was designed and synthesized by the hydrothermal reduction method and metal doping modification method. The microstructure and electrochemical performance of the Co<sub>3</sub>O<sub>4</sub>-doped Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> composite were characterized by XRD, SEM, TEM, electrochemical impedance spectroscopy, and galvanostatic tests. The results showed that Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> particles attached to lamellar Co<sub>3</sub>O<sub>4</sub> constituted a heterostructure and Co ion doped into Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> lattice. This Co ion-doped microstructure improved the charge transportability of Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> and inhibited the gas evolution behavior of Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>, 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<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> at 5 A/g.</p>