Title

Resolving the Role of Configurational Entropy in Improving Cycling Performance of Multicomponent Hexacyanoferrate Cathodes for Sodium‐Ion Batteries.

Authors

Ma, Yanjiao; Hu, Yang; Pramudya, Yohanes; Diemant, Thomas; Wang, Qingsong; Goonetilleke, Damian; Tang, Yushu; Zhou, Bei; Hahn, Horst; Wenzel, Wolfgang; Fichtner, Maximilian; Ma, Yuan; Breitung, Ben; Brezesinski, Torsten

Abstract

Mn‐based hexacyanoferrate (Mn‐HCF) cathodes for Na‐ion batteries usually suffer from poor reversibility and capacity decay resulting from unfavorable phase transitions and structural degradation during cycling. To address this issue, the high‐entropy concept is here applied to Mn‐HCF materials, significantly improving the sodium storage capabilities of this system via a solid‐solution mechanism with minor crystallographic changes upon de‐/sodiation. Complementary structural, electrochemical, and computational characterization methods are used to compare the behavior of high‐, medium‐, and low‐entropy multicomponent Mn‐HCFs resolving, to our knowledge for the first time, the link between configurational entropy/compositional disorder (entropy‐mediated suppression of phase transitions, etc.) and cycling performance/stability in this promising class of next‐generation cathode materials.

Subjects

CATHODES; SODIUM ions; ENTROPY; PHASE transitions; STORAGE batteries; CYCLING competitions

Publication

Advanced Functional Materials, 2022, Vol 32, Issue 34, p1

ISSN

1616-301X

Publication type

Academic Journal

DOI

10.1002/adfm.202202372