Materials Research Bulletin, Vol.99, 343-348, 2018
Porous NaTi2(PO4)(3)@C nanocubes as improved anode for sodium-ion batteries
The NASICON-type NaTi2(PO4)(3) has drawn much attention as anode material for sodium-ion batteries owing to its stable structural characteristics and low cost. Nevertheless, the insulating property of NaTi2(PO4)(3) and the high working potential of about 2.1 V vs. Na+/Na lead to its poor cycling stability, low rate, performance as well as inferior capacity. In this work, we synthesize the porous NaTi2(PO4)(3)@C nanocubes by hydrothermal method and a subsequent coating process with using oleic acid as the carbon source. When utilized as the anode for sodium-ion battery in the voltage range between 0.01 V and 3.0 V, The as-synthesized porous NaTi2(PO4)(3)@C nanocubes deliver a discharge capacity of 201 mAh.g(-1) at the current density of 100 mA g(-1) after 100 cycles. Additionally, the reserved capacity of 140 mAh.g(-1) could be achieved at the current density of 1 A g(-1) after 1000 cycles.