Batteries: Effect of Carbon Matrix Dimensions on the Electrochemical Properties of Na₃V₂(PO₄)₃ Nanograins for High‐Performance Symmetric Sodium‐Ion Batteries (Adv. Mater. 21/2014)

Na-ion batteries are promising alternatives to Li-ion batteries. L. Q. Mai and co-workers on page 3545 show that Na3V2(PO4)3 nanograins in a carbon nanosphere matrix exhibit the best performance due to the high sodium flux across the interface of the electrode. A novel symmetric sodium-ion battery utilizing Na3V2(PO4)3 nanograins simultaneously for the cathode and the anode can be assembled, which shows satisfying electrochemical performance and has good prospects for grid-scale energy storage.