Enhanced high-rate performance of Br-doping Li4Ti5O12 microspheres as anode materials for lithium-ion batteries

Br-doping Li4Ti5O12 microspheres (LTOS) with micro-nano hierarchical structure are synthesized using cetyltrimethylammonium hydroxide-assisted hydrothermal and further calcination. The morphology of the obtained LTOS were characterized by X-ray diffraction, scanning electron microscopy photoelectron spectroscopy. It is found that spherical spinel-type microstructure do not change after appropriate Br doping, but relative content Ti3+ increases, which beneficial for fast transmission electronics ions. Therefore, rate performances evidently improved doping. Among doped samples, 0.2Br-LTOS delivers superior performance cyclic ability. Their specific capacities at 1C, 5C, 10C, 20C, 30C 40C 133, 127, 121, 114, 109 105 mAh·g?1, respectively. Even 50C 60C, their still as high 101 96 Moreover, capacity retention ratio about 87.8% 1000 cycles higher than 76.5% pure LTOS.