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High-Temp Sodium-Zinc Batteries Reveal Causes of Rapid Capacity Loss

Researchers at Germany's Helmholtz‑Zentrum Dresden‑Rossendorf used operando X‑ray radiography to watch sodium‑zinc molten‑salt batteries function at 600 °C, uncovering hidden aging mechanisms. The imaging revealed liquid‑metal movement, dendrite formation, and electrolyte breakdown that together drive rapid capacity loss. Although the chemistry promises low‑cost, abundant materials for stationary storage, these instability issues have stalled commercial rollout. The study provides the first direct visual evidence needed to engineer more reliable high‑temperature cells.