Ionothermal synthesis of sponge-like nano Li4Ti5O12 for high rate lithium-ion batteries

摘要: The sponge-like Li4Ti5O12 (LTO) with nanostructure was synthesized by a novel ionothermal method using 1-decyl-3-methylimidazolium tetrafluoroborate ([DEMIM]BF4) as both structure-directing agent and reaction medium at ambient pressure. samples were characterized powder x-ray diffraction analysis, scanning electron microscopy, transmission N2 adsorption measurement, galvanostatic charge–discharge test, electrochemical impedance spectroscopy. results show that the LTO material present even distribution of pore diameter mainly ranging from 3.7 to 5.0 nm large specific surface area 182 m2 g−1. electrode exhibits high capacity 170.2 161.2 mAh g−1 rate 1 20 concentrations (C) for first cycle remained 95.1 91.0 % after 100 cycles, charge transfer resistance lithium-ion diffusion coefficient are 22.70 Ω 9.8 × 10−10 cm2 s−1, respectively. Sample carbon coating further improves performance reduced enhanced cycling stability. These excellent performances can be ascribed improving ion conductivity.