Coulombic self-ordering upon charging a large-capacity layered cathode material for rechargeable batteries.

ABSTRACT: Lithium- and sodium-rich layered transition-metal oxides have recently been attracting significant interest because of their large capacity achieved by additional oxygen-redox reactions. However, layered transition-metal oxides exhibit structural degradation such as cation migration, layer exfoliation or cracks upon deep charge, which is a major obstacle to achieve higher energy-density batteries. Here we demonstrate a self-repairing phenomenon of stacking faults upon desodiation from an oxygen-redox layered oxide Na₂RuO₃, realizing much better reversibility of the electrode reaction. The phase transformations upon charging A₂MO₃ (A: alkali metal) can be dominated by three-dimensional Coulombic attractive interactions driven by the existence of o

SUBMITTER: Mortemard de Boisse B 

PROVIDER: S-EPMC6522540 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature