Wu, Jiangtao, Yang, Lingxu, Liu, Huijun, Bu, Huanpeng, Wang, Wenjun, Zeng, Chaoliu, and Zhu, Shenglong
The Na1+xAlxTi2−x(PO4)3/C (x = 0, 0.05, 0.10, 0.20) composites serving as anode for aqueous sodium ion battery are successfully synthesized through a facile sol–gel route. The results indicate that introduction of proper amount of aluminum has no obvious effect on the structure and morphology of NaTi2(PO4)3/C. Among the four synthesized samples, Na1.1Al0.1Ti1.9(PO4)3/C (NATP-0.10) exhibits the best electrochemical performance. NATP-0.10 delivers a discharge specific capacity of 115.8, 106.9, 98.4, and 89.1 mAh g−1 at 2, 5, 10, and 20 C rate, respectively, and still retains 114.7 mAh g−1 when the current density comes back to 2 C. Additionally, NATP-0.10 exhibits an initial discharge capacity of 102.9 mAh g−1 and still retains a reversible capacity of 90.1 mAh g−1 at 10 C rate after 200 cycles. Cyclic voltammetry and electrochemical impedance spectroscopy demonstrate the better electrochemical performance of NATP-0.10 is due to the faster sodium migration and enhanced electrochemical kinetics. Al doping Na1+xAlxTi2−x(PO4)3/C (x = 0, 0.05, 0.10, 0.20) composites were firstly used as anodes in aqueous SIBs. The electrochemical performance of NaTi2(PO4)3/C has been improved by introducing a proper amount of Al. [ABSTRACT FROM AUTHOR]