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- Title
Surface-Engineered Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> Nanostructures for High-Power Li-Ion Batteries.
- Authors
Gangaja, Binitha; Nair, Shantikumar; Santhanagopalan, Dhamodaran
- Abstract
Highlights: Surface-engineered Li4Ti5O12 nanoparticles were synthesized by an off-stoichiometric solvothermal process. The electrode exhibited ultrafast charge–discharge (up to 1200C) performances in a half-cell configuration. A full cell consisting of the engineered Li4Ti5O12 anode and LiMn2O4 cathode exhibited an ultrahigh-rate capability (up to 200C), long cycling life (1000 cycles), and robust performances (at − 10, 25, and 55 °C). Materials with high-power charge–discharge capabilities are of interest to overcome the power limitations of conventional Li-ion batteries. In this study, a unique solvothermal synthesis of Li4Ti5O12 nanoparticles is proposed by using an off-stoichiometric precursor ratio. A Li-deficient off-stoichiometry leads to the coexistence of phase-separated crystalline nanoparticles of Li4Ti5O12 and TiO2 exhibiting reasonable high-rate performances. However, after the solvothermal process, an extended aging of the hydrolyzed solution leads to the formation of a Li4Ti5O12 nanoplate-like structure with a self-assembled disordered surface layer without crystalline TiO2. The Li4Ti5O12 nanoplates with the disordered surface layer deliver ultrahigh-rate performances for both charging and discharging in the range of 50–300C and reversible capacities of 156 and 113 mAh g−1 at these two rates, respectively. Furthermore, the electrode exhibits an ultrahigh-charging-rate capability up to 1200C (60 mAh g−1; discharge limited to 100C). Unlike previously reported high-rate half cells, we demonstrate a high-power Li-ion battery by coupling Li4Ti5O12 with a high-rate LiMn2O4 cathode. The full cell exhibits ultrafast charging/discharging for 140 and 12 s while retaining 97 and 66% of the anode theoretical capacity, respectively. Room- (25 °C), low- (− 10 °C), and high- (55 °C) temperature cycling data show the wide temperature operation range of the cell at a high rate of 100C.
- Subjects
LITHIUM-ion batteries; NANOPARTICLES; NANOSTRUCTURES; TITANIUM dioxide; LONGEVITY; CATHODES
- Publication
Nano-Micro Letters, 2020, Vol 12, Issue 1, pN.PAG
- ISSN
2311-6706
- Publication type
Article
- DOI
10.1007/s40820-020-0366-x