Novel Solid-State Sodium-Ion Battery with Wide Band Gap NaTi(2)(PO(4))(3) Nanocrystal Electrolyte

[Image: see text] NaTi(2)(PO(4))(3) (NTP), a well-known anode material, could be used as a solid wide-band gap electrolyte. Herein, a novel solid-state sodium-ion battery (SSIB) with the thickness of electrolyte up to the millimeter level is proposed. The results of the difference in charge density investigated by the first-principles calculations imply that using the NTP nanocrystals as electrolytes to transport sodium ions is feasible. Moreover, the SSIB exhibits a high initial discharge capacity of 3250 mAh g(–1) at the current density of 50 mA g(–1). As compared with other previously reported SSIBs, our results are better than those reported and suggest that the NTP nanocrystals have potential application in SSIBs as solid electrolytes.