文献类型：期刊文献

英文题名：Enhancements of the structures and electrochemical performances of Li4Ti5O12 electrodes by doping with non-metallic elements

作者：Li, Yanan Gao, Hong Yang, Wude

第一作者：Li, Yanan

机构：[1] College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, 550025, China; [2] Medicinal Minerals and Resources Development and Research Center, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, 550025, China; [3] Guizhou Institute of Technology, Guiyang, Guizhou, 550003, China

第一机构：College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, 550025, China

年份：2022

卷号：409

外文期刊名：Electrochimica Acta

收录：EI(收录号：20220611594668);Scopus(收录号：2-s2.0-85124016240)

语种：英文

外文关键词：Electron transport properties - Particle size - Charge transfer - Electronic structure - Chlorine - Electrochemical electrodes - Metals - Crystal structure - Bromine

摘要：This paper systematically explores the non-metallic element (F, Cl, Br, I, C and N) doping modification of lithium titanate oxide(LTO) electrode materials. C, N, and Br play a significant role in improving the electrochemical performance of lithium titanate, and each of them had different modification advantages. In terms of the structure changes of LTO, it was found that the C dopant significantly reduced the particle size and agglomeration between LTO particles, the Br dopant performed best in increasing the unit cell volume of the LTO, and the N dopant could form oxygen vacancies and a small amount of metallic TiN structure. In terms of electrochemical performance change of the LTO, the C dopant could effectively reduce the charge transfer resistance, the Br dopant could significantly improve the capacity at low rates(174.5 mAh g?1 at 0.1 C; 172.3 mAh g?1 at 0.5 C), and the N dopant could greatly promote the high rate performance of LTO (compared with pure LTO, the capacity of N-LTO at 10 C and 20 C, increased by 13.5% and 4.1%, respectively). The three dopants could induce different numbers of Ti3+ active sites, narrow the bandgap, and thereby thus facilitate the electron transport in the lattice of the LTO. This study provides new insights into optimizing the electrochemical performance of Li4Ti5O12 by adjusting the morphology, crystal structure, and electronic structure of lithium titanate based on the characteristics of non-metallic materials. ? 2022