Jump to main content
Jump to site search


Rational Design of Na(Li1/3Mn1/2Cr1/6)O2 Exhibiting Cation-Anion-Coupled Redox Reactions with Superior Electrochemical, Thermodynamic, Atomic, and Chemomechanical Properties for Advanced Sodium-Ion Batteries

Abstract

Anionic redox reactions (O2-/O-), an alternative to conventional cationic redox reactions (Mn+/M(n+1)+; M: transition metals), have recently been identified as essential to achieve high energy density cathodes for sodium-ion batteries (SIBs). To overcome the drawbacks of anionic redox reactions leading to phase change and separation in the newly discovered Na(Li1/3Mn2/3)O2 material (NLMO, ~4.2 V vs. Na/Na+ with a high charge capacity of 190 mAh g-1), we have rationally designed high energy density Na(Li1/3Mn1/2Cr1/6)O2 (NLMCO) coupled the Cr 3d-electron with the labile O 2p-electron coordinated with Mn4+ for charge compensation during desodiation processes. NLMCO exhibits reduced phase change and separation and chemomechanical strain and stress compared to those of NLMO and is thus expected to show high electrochemical performance, where the formation of short O–O bonds is not observed. By correlating the thermodynamic energy behavior with the redox mechanism in NLMO, it is concluded that our systematically designed cation-anion-coupled NLMCO is an excellent cathode material, introducing advanced materials of formula Na(Li1/3M2/3(1-y)Mcy)O2 (M and Mc: transition metals with stabilized M4+ species and cationic redox active Mc4+ species) for next-generation SIBs.

Back to tab navigation

Supplementary files

Publication details

The article was received on 16 Mar 2018, accepted on 02 Aug 2018 and first published on 02 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA02435A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
  •   Request permissions

    Rational Design of Na(Li1/3Mn1/2Cr1/6)O2 Exhibiting Cation-Anion-Coupled Redox Reactions with Superior Electrochemical, Thermodynamic, Atomic, and Chemomechanical Properties for Advanced Sodium-Ion Batteries

    D. Kim, M. Cho and K. Cho, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02435A

Search articles by author

Spotlight

Advertisements