Impact of NaH on the Electrochemical Performance of Sodium Batteries.

ABSTRACT: Secondary reactions and solid-electrolyte interface (SEI) formation are crucial aspects for battery lifetime. We show that one part of a natural SEI consists of crystalline NaH, which is formed on the sodium surface when carbonate-based electrolytes are used. Its impact on the electrochemical performance was studied using room-temperature H₂-treated Na anodes and a NaH-Na composite anode. Depending on the preparation conditions, hydrogen was stored on the Na surface in the form of NaOH, enhancing the long-term performance of the cell with a layered Na-oxide cathode, or in the form of NaH, deteriorating the performance in comparison to a reference Na cell. With the help of thermogravimetry coupled with mass spectrometry, we identified an explosion-like thermal decomposition of fa

SUBMITTER: Thomas A 

PROVIDER: S-EPMC11780441 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature