Li1.3Al0.3Ti1.7(PO4)(3) Behavingas a Fast Ionic Conductor and Bridge to Boost the Electrochemical Performance of Li4Ti5O12

摘要

Li1.3Al0.3Ti1.7(PO4)(3) (LATP) is a Li-ion conductive solid electrolyte with high ionic conductivity; mean-while, it also possesses relatively high electronic conductivity compared to those of the other fast ionic conductors. In this work, LATP was composited with Li4Ti5O12 (LTO) at a mass ratio of 0.026 and calcined at 700 degrees C for 5 h. The composite delivers reversible capacities of 164.8, 156.3, 152.4, 146.5, 130.5, and 158.6 mAh g(-1) at the current densities of 100, 200, 0 400, 800, 1600, and 100 mA g(-1), respectively, as well as a capacity of 112 mAh g(-1) after cycling at 500 mA g(-1) for 1200 cycles. The appreciable performance is attributable to the three-dimensional Li-ion diffusion channels in LATP to facilitate Li-ion migration, and the local charge imbalance resulted from the substitution of Al3+ for Ti4+ to promote charge transfer in LTO, thus the LATP-composited LTO exhibits enhanced ionic and electronic conductivities, as well as the markedly boosted electrochemical performance.