Stabilizing anionic redox in Mn-rich P2-type layered oxide material by Mg substitution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F23%3A43933908" target="_blank" >RIV/60461373:22310/23:43933908 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1385894723031819?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1385894723031819?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cej.2023.144450" target="_blank" >10.1016/j.cej.2023.144450</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stabilizing anionic redox in Mn-rich P2-type layered oxide material by Mg substitution

Popis výsledku v původním jazyce

Anionic oxygen redox reactions provide additional reversible capacity beyond 4 V in Mn-rich layered oxide cathodes; however, the irreversible anionic redox intensifies the structural deterioration, resulting in capacity fading. This study reports a stable anionic redox in Mn-rich P2-type Na0.67Mn0.8Fe0.1Ni0.1O2 by substituting Ni via Mg in the TM layer. The similarities in size and valence state of Mg2+ and Ni2+ confirm the homogenous substitution of Mg2+ into the TM layer, maintaining the layered structure. Mg2+ ion in the TM layer provides thermodynamic phase stability and facilitates the extra charge on the O atom that aggravates the oxidation of O, mitigating irreversible oxygen redox. As a result, Na0.67Mn0.8Fe0.1Mg0.1O2 displayed better reversibility in an expanded voltage range of 1.5-4.5 V and improved rate capability compared to Na0.67Mn0.8Fe0.1Ni0.1O2. Furthermore, Mg substitution reinforces the reversibility of the P2-O2 phase transition and improves Na+ diffusion kinetics. Hence, the profound study on Mg substitution in Mn-rich P2-type layered oxide is constructive to stabilize the anionic oxygen redox.

Název v anglickém jazyce

Stabilizing anionic redox in Mn-rich P2-type layered oxide material by Mg substitution

Popis výsledku anglicky

Anionic oxygen redox reactions provide additional reversible capacity beyond 4 V in Mn-rich layered oxide cathodes; however, the irreversible anionic redox intensifies the structural deterioration, resulting in capacity fading. This study reports a stable anionic redox in Mn-rich P2-type Na0.67Mn0.8Fe0.1Ni0.1O2 by substituting Ni via Mg in the TM layer. The similarities in size and valence state of Mg2+ and Ni2+ confirm the homogenous substitution of Mg2+ into the TM layer, maintaining the layered structure. Mg2+ ion in the TM layer provides thermodynamic phase stability and facilitates the extra charge on the O atom that aggravates the oxidation of O, mitigating irreversible oxygen redox. As a result, Na0.67Mn0.8Fe0.1Mg0.1O2 displayed better reversibility in an expanded voltage range of 1.5-4.5 V and improved rate capability compared to Na0.67Mn0.8Fe0.1Ni0.1O2. Furthermore, Mg substitution reinforces the reversibility of the P2-O2 phase transition and improves Na+ diffusion kinetics. Hence, the profound study on Mg substitution in Mn-rich P2-type layered oxide is constructive to stabilize the anionic oxygen redox.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20400 - Chemical engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemical Engineering Journal

ISSN

1385-8947

e-ISSN

1873-3212

Svazek periodika

471

Číslo periodika v rámci svazku

September 2023

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

10

Strana od-do

144450

Kód UT WoS článku

001040477300001

EID výsledku v databázi Scopus

2-s2.0-85164302986