期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 929, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2022.117101
关键词
Li 4 Ti 5 O 12 material; Soccerene structure; Carbon coating; Rate capability; Fast charging
By constructing carbon-coated LTO with a unique soccerene-like structure, the electron and ion transport of Li4Ti5O12 (LTO) as an anode material for Li-ion batteries (LIBs) is improved. The composite exhibits remarkable high-rate discharge capacity and excellent cyclic stability.
Li4Ti5O12 (LTO) with great promising anode material for Li-ion batteries (LIBs) has attracted extensive atten-tion, while the large-scale application is hampered owing to the low electronic conductivity and Li+ diffusion coefficient. Herein, the carbon-coated LTO with a unique soccerene-like structure is constructed to simultane-ously improve the electron and ion transport by the simple and scalable soft template method. The as-obtained LTO/C material exhibits unique soccerene-like morphology with a large specific surface area and abundant open channels, which can endow the rapid diffusion for Li+ and electrons, and provide more favorable paths for penetration of the electrolyte. Besides, the carbon layer (about 3 nm) on the surface of LTO material can improve the electronic conductivity. Therefore, the LTO/C shows superior electrochemical performance, espe-cially at high-rate discharging.The composite delivers remarkable discharge-specific capacities of 175.42, 170.45, 165.76, 158.90, 153.13, 147.32, 138.64, and 126.95 mA h g-1 at 0.2, 1, 3, 5, 10, 20, 40, and 80C, respectively as well as excellent cyclic stability at 20C with high capacity retention of 99.5 % over 1008 cycles. The composite with a unique soccerene-like structure provides a good prospect for the design of anode material for Li-ion batteries with high rate and long cycling life.
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