Porous NaTi2(PO4)3 Nanocubes Anchored on Porous Carbon Nanosheets for High Performance Sodium-Ion Batteries

NaTi2(PO4)3 has attracted great interest as anode material for sodium ion batteries owing to its open three-dimensional framework structure and almost unchanged volume during the charge and discharge process. However, the poor intrinsic electronic conductivity of NaTi2(PO4)3 still needs to be improved. In this work, porous NaTi2(PO4)3 nanocubes anchored on porous carbon nanosheets (NaTi2(PO4)3/C) are designed to improve the electrical conductivity. This material exhibit a large discharge capacity and good rate capacity: The first discharge capacity can reach 485 mAh g-1 at a current density of 0.1 A g-1; A capacity of 98 mAh g-1 can be retained at a high rate of 4 A g-1 even after 2,000 cycles. These results suggest that NaTi2(PO4)3/C is a promising anode material for sodium-ion batteries.