Preparation and Characterization of Gradient Sealing Material for Sodium Anode Based Battery

A functional gradient material(FGM) based sealing was designed and applied to seal the α-Al2O3 insulator with Na-β-Al2O3 solid electrolyte of sodium anode batteries.FGMs with different component change rates were fabricated by powder stacking method.The experimental results indicated that the two dimensional feature of Na-β-Al2O3 grains greatly influenced the density of the α-Al2O3/Na-β-Al2O3 composite ceramics.It was demonstrated that the chemical diffusion of Na and Li in FGM diminished the interfaces among diffrent layers.Bending strengths of the FMGs reached(130±2),(180±3) and(225±2) MPa for the samples with component change rate of 20wt%,10wt% and 5wt%,respectively.Moreover,the mechanical performance of the FGMs was rarely affected by heat treatment and thermal cycling,demonstrating its favorable mechanical and thermal stability.