Summary:

The invention discloses a sodium sulfide ion solid electrolyte and a preparation method thereof, the chemical formula of the sulfide sodium ion solid electrolyte is Na4-x-z[Sn1-yMy]NxS4-zXz, wherein M is at least one of Si or Ge, N is at least one of P or Sb, and X is at least one of Cl, Br, I; 0≤x≤0.6，0.30≤y≤0.35，0≤z≤0.1。 The crystal structure of the sodium sulfide solid electrolyte has an I41/acd space group, with isolated [Sn/M]S4 and [Sn/M/N]S4 tetrahedra forming the skeleton, and sodium ions filling the six unoccupied crystal positions. When x=0, the ionic conductivity is greater than 10-5S/cm; 0-4S/cm~10-3S/cm order of magnitude. The solid electrolyte material provided by the present invention has high ionic conductivity and good air stability, and the raw materials used in the synthesis of the material are widely sourced, the price is relatively low, and there are certain advantages in the use cost.

Link: http://epub.cnipa.gov.cn/patent/CN109888376A?8kt2YOWWXQBD=1667821842072