Coulombic self-ordering upon charging a large-capacity layered cathode material for rechargeable batteries
NISHIMURA, Shin-Ichi
Department of Chemical System Engineering
Unit of Element Strategy Initiative for Catalysts & Batteries, ESICB, Kyoto University
Department of Chemical System Engineering
Unit of Element Strategy Initiative for Catalysts & Batteries, ESICB, Kyoto University
OKUBO, Masashi
Department of Chemical System Engineering
Unit of Element Strategy Initiative for Catalysts & Batteries, ESICB, Kyoto University
Department of Chemical System Engineering
Unit of Element Strategy Initiative for Catalysts & Batteries, ESICB, Kyoto University
YAMADA, Atsuo
Department of Chemical System Engineering
Unit of Element Strategy Initiative for Catalysts & Batteries, ESICB, Kyoto University
< Reduce
Department of Chemical System Engineering
Unit of Element Strategy Initiative for Catalysts & Batteries, ESICB, Kyoto University
Language
en
Article de revue
This item was published in
Nature Communications. 2019-12, vol. 10, p. 2185 (7 p.)
Nature Publishing Group
English 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 ...Read more >
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 ordered alkali-metal vacancies, leading to counterintuitive self-repairing of stacking faults and progressive ordering upon charging. The cooperatively ordered vacancy in lithium-/sodium-rich layered transition-metal oxides is shown to play an essential role, not only in generating the electro-active nonbonding 2p orbital of neighbouring oxygen but also in stabilizing the phase transformation for highly reversible oxygen-redox reactions.Read less <
Origin
Hal imported