Bridging multiscale interfaces for developing ionically conductive high-voltage iron sulfate-containing sodium-based battery positive electrodes.

ABSTRACT: Non-aqueous sodium-ion batteries (SiBs) are a viable electrochemical energy storage system for grid storage. However, the practical development of SiBs is hindered mainly by the sluggish kinetics and interfacial instability of positive-electrode active materials, such as polyanion-type iron-based sulfates, at high voltage. Here, to circumvent these issues, we proposed the multiscale interface engineering of Na_2.26Fe_1.87(SO₄)₃, where bulk heterostructure and exposed crystal plane were tuned to improve the Na-ion storage performance. Physicochemical characterizations and theoretical calculations suggested that the heterostructure of Na₆Fe(SO₄)₄ phase facilitated ionic kinetics by densifying Na-ion migration channels

SUBMITTER: Zhang J 

PROVIDER: S-EPMC10287750 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature