Cover Picture: Unveiling the Degradation Mechanism of Sodium Ion Batteries Based on Na4Fe3(PO4)2P2O7 Cathode and Hard Carbon Anode Suggests Anode Particle Size Reduction for Cycling Stability (Batteries & Supercaps 8/2024)

The Cover Feature shows sodium-ion batteries—a compelling alternative to lithium-ion counterparts due to sodium‘s abundant presence on Earth. Unlike lithium, their materials can be sourced without geopolitical concerns. Yet, their advance has been hindered by a poor life cycle. Electrochemical analysis, materials characterization and modeling pinpointed the root cause of capacity decay: sluggish sodium diffusion triggers anode overpotential and cathode material loss. Shrinking anode particle size enhances both capacity and longevity. With cost-effective materials and streamlined processes, sodium-ion batteries promise a compelling solution for stationary storage needs. More information can be found in the Research Article by S. P. Adiga and co-workers (DOI: 10.1002/batt.202400025).