Electrical conductivity of Na2O–Nb2O5–P2O5 glass and fabrication of glass–ceramic composites with NASICON type Na3Zr2Si2PO12

Abstract

Electrical conductivity of xNa2O–(70−x)Nb2O5–30P2O5 glass was examined. The electrical conductivity of the glasses increases monotonously with increasing Na2O content, and the glass of 60Na2O–10Nb2O5–30P2O5 shows the value of σ=5.6×10−8Scm−1 at room temperature and the activation energy (Ea) of 0.54eV for Na+ ion mobility from 25°C to 200°C. We also examined the fabrication of glass–ceramic composites, which is consisted from Na3Zr2Si2PO12 and 60Li2O–10Nb2O5–30P2O5 glass. It found that the mixture of 90wt.% NaNa3Zr2Si2PO12–10wt.% 60Na2O–10Nb2O5–30P2O5 glass calcined at 900°C for 10min, gives σ=1.2×10−4Scm−1 at room temperature. Na2O–10Nb2O5–30P2O5 glass is suitable filler material for solid electrolyte in sodium ion batteries.