Figure 1: Synthesis of Na-based alloys.
From: Insertion compounds and composites made by ball milling for advanced sodium-ion batteries
(a) Schematic diagram showing the ball milling process exemplified for the formation of NaxM alloys (yellow) by reacting Na (blue) with metal M (M=P or Sb) (red). In b,c and d,e, the Rietveld refined X-ray powder patterns of Na3P and Na3Sb powders are respectively shown together with their corresponding electrochemical voltage-profile in Na-half cells.
