Research progress on improving ionic conductivity of NZSP solid electrolyte

Due to the limited resources of lithium batteries, and the safety of liquid electrolytes, and the working principle of sodium batteries and lithium batteries are similar, and the cost is relatively low, so the development of sodium ion solid state batteries has its feasibility and necessity. Among them, NASICON solid electrolyte with its unique three-dimensional structure, and good thermoelectric performance has been widely concerned, in order to better understand the development of such materials and the latest developments, this paper reviews the crystal structure of NZSP solid electrolyte, conductive mechanism, preparation methods of research progress. NZSP solid electrolyte with its room temperature asymmetric monoclinic phase and large grain boundary resistance, resulting in ionic conductivity is not enough to meet the application needs, on the basis of the above content, for the existence of NZSP ionic conductivity low problem, related discussions were carried out. The research progress of improving the ionic conductivity of NZSP based on preparation technology, grain control and grain boundary control is discussed. And in the end, the possible future development trend of NZSP material is summarized and prospected, which will play a certain reference and promotion role for the future research on NASICON solid electrolyte.