Abstract
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 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.
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