Influence of Ion Size on Structure and Redox Chemistry in Na-Rich and Li-Rich Disordered Rocksalt Battery Cathodes.

ABSTRACT: Li-rich disordered rocksalts are promising next-generation cathode materials for Li-ion batteries. Recent reports have shown it is also possible to obtain Na-rich disordered rocksalts, however, it is currently poorly understood how the knowledge of the structural and redox chemistry translates from the Li-rich to the Na-rich analogs. Here, the properties of Li₂MnO₂F and Na₂MnO₂F are compared, which have different ion sizes (Li⁺ = 0.76 vs Na⁺ = 1.02 Å) but the same disordered rocksalt structure and stoichiometry. It is found that Na₂MnO₂F exhibits lower voltage Mn- and O-redox couples, opening access to a wider compositional range within the same voltage limits. Furthermore, the intercalation mechanism s

SUBMITTER: Mitchell NC 

PROVIDER: S-EPMC12355563 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature