▎ 摘　　要

NaTi2(PO4)(3)/graphene composites had been synthesized by a sol-gel and post heat-treatment approach. Different graphene content in the final NaTi2(PO4)(3)/graphene composites had a large influence on the electrochemical performance of aqueous rechargeable sodium ion batteries (NIBs), especially the rate property. Among the prepared NaTi2(PO4)(3)/graphene composites, the 6.84% graphene contained NaTi2(PO4)(3) sample displayed the highest capacity, which was about 63.5 mA h g(-1) at 20 degrees C, and retained 71% of the initial capacity after 2000 cycles. Furthermore, this sample also exhibited good cycling performance in non-aqueous NIBs, with a reversible capacity of 102 mA h g(-1) after 700 cycles at 100 mA g(-1). The graphene plays a critical role in enhancing the cycling stability and rate property of NaTi2(PO4)(3) in rechargeable NIBs. Composited with appropriate amount of grephene, NaTi2(PO4)(3) possesses better electrochemical performance. (C) 2014 The Electrochemical Society. All rights reserved.