Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 32, Pages 15755-15761Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta05860a
Keywords
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Funding
- National Science Foundation of China [21403139, 51472161, 51671135, 51472160, 51501107]
- Key Program for the Fundamental Research of the Science and Technology Commission of Shanghai Municipality [15JC1490700, 15JC1490800, 12JC1406900]
- Program of Shanghai Subject Chief Scientist [17XD1403000]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- [ZZsl15059]
- [ZZslg16063]
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Spinel lithium titanate (Li4Ti5O12, LTO) is one of the most appealing anode materials for lithium-ion batteries (LIBs) due to its long cycle life and high safety performance. However, its low intrinsic electronic conductivity limits its high rate capability. Herein, we develop a novel one-pot in situ molecular self-assembly approach to prepare a dual N- and anatase-TiO2- modified Li4Ti5O12/C nanorod material (NT-LTO/C). Polypyrrole (PPy), as a pivotal carbon and nitrogen source, is introduced to confine the morphology and particle size of the NT-LTO/C anode. Due to the synergistic effects of the multilevel particle structure, uniform carbon coating, N doping, anatase TiO2 pseudopotential effect and such benefits, the NT-LTO/C electrode delivers a high reversible capacity of 196.3 mA h g(-1) at 0.5C, and it maintains 105.5 mA h g(-1) even at an ultrahigh rate of 100C with progressive cycling of more than 3000 cycles. In addition, the three electrode pouch full-cell shows much smaller polarization than the pristine one. This novel and facile molecular self-assembly method has broad advanced functional material applications including for ceramics, polymer/carbon-based metal alloys and inorganic non-metallic materials.
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