Investigation Into the Electrochemical Performance of Micron‐ and Nanosized Tin in Diglyme and Carbonate Electrolytes in Sodium Ion Batteries (Adv. Energy Mater. 27/2026)

Sodium Ion Batteries In article number e71023, John T. S. Irvine and co-workers found that the cycling stability of Sn negative electrode is governed not only by mechanical expansion of Sn but also by the interplay between particle size and electrolyte chemistry. Diglyme electrolytes maintain electrode integrity through a robust SEI despite extreme volume changes, while carbonate electrolytes suffer catalytic decomposition on Sn surfaces, leading to unstable interphases and accelerated capacity fading. These findings reveal that interfacial instability, amplified by particle-size reduction, dominates long-term degradation.