Enhancing the Sodium Storage Performance of NaMnCr(PO) through the Manipulation of Intrinsic Site Occupation Defects.

Manganese-based NASICON-type compounds are promising as high-energy-density cathodes for sodium-ion batteries. However, the structural defects of Mn ions inside the crystal framework reduce the sodium storage capacity, voltage plateau, and cyclic stability of the cathodes. Here, a strategy to inhibit the Mn ion defects of NaMnCr(PO) has been proposed by using different phosphate sources. It is found that NaMnCr(PO) prepared with NHHPO (NMCP-N) exhibits less noticeable voltage hysteresis than that of NaMnCr(PO) prepared with HPO (NMCP-H), indicating that the site occupation defects of Mn ions in the NaMnCr(PO) crystal structure are successfully suppressed, as confirmed by theoretical calculations and structural refinements. In the case of NMCP-N, a capacity of 109.7 mAh g is delivered at 0.01 A g, and 54.2% capacity retention can be kept after 500 cycles at 0.5 A g, which is much better than that of the counterpart of NMCP-H (a lower capacity of 96.1 mAh g and poorer cyclability of only 22.8% capacity retention after 500 cycles), showing that the structure defects strongly affect the sodium storage properties of NaMnCr(PO) cathodes. This work provides an effective strategy to manipulate the structure defects of Mn-based NASICON-type cathode materials to enhance their electrochemistry.