Structural and electrochemical characteristics of hierarchical Li4Ti5O12 as high-rate anode material for lithium-ion batteries. (1st February 2021)

• Record Type: Journal Article
• Authors: Wang, Hanyong; Wang, Lecai; Lin, Jiao; Yang, Jingbo; Wu, Feng; Li, Li; Chen, Renjie
• Is Part Of: Electrochimica acta. Volume 368(2021)
• Publication Date: 2021-02-01
• Subjects: Li4Ti5O12 -- Hierarchical structure -- Carbon coating -- Lithium-ion battery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.137470
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Hierarchical LTO materials were synthesized by a simple one-pot process. LTO materials were improved by hierarchical structure design and conductive carbon coating. The h-LTO materials were improved from dynamic and electrochemical performances. Abstract: The use of Li4 Ti5 O12, which is a zero-strain material, as an anode material for lithium-ion batteries is hampered by its low electronic conductivity and low lithium-ion diffusion coefficient. In this study, we design a hierarchically structured Li4 Ti5 O12 material with a conductive carbon coating to improve the material's electrochemical properties. Hexadecyl trimethylammonium bromide is used as a structure-guiding agent and as a carbon source together with glucose. The discharge specific capacities of the obtained materials are 170.37, 167.34, 163.05, 158.03, and 151.49 mA h g −1 at rates of 0.5, 1, 2, 5, and 10 C, respectively. Even at a high rate, namely 25 C, for 500 cycles, a discharge specific capacity of 144.05 mA h g −1 with 96.3% capacity retention is achieved. We believe that hierarchical Li4 Ti5 O12 materials with a carbon coating have potential applications as anode materials for the future development of lithium-ion batteries.