Vacancies-regulated Prussian Blue Analogues through Precipitation Conversion for Cathodes in Sodium-ion Batteries with Energy Densities over 500â
Wh/kg.
Angew Chem Int Ed Engl
; : e202400214, 2024 Feb 01.
Article
em En
| MEDLINE
| ID: mdl-38299760
ABSTRACT
Prussian blue analogues (PBAs) have been widely applied in many fields, especially as cathode materials of sodium-ion batteries on account of their low cost and open framework for fast ions transport. However, the capacity of reported PBAs has a great distance from its theoretical value. Herein, we proposed that [Fe(CN)6 ] vacancies are crucial point for the high specific capacity for the first time. The [Fe(CN)6 ] vacancies may create net electrons and reduce obstacles to ionic transport, which is conducive to rate performance of PBAs by increasing electronic and ionic conductivity to some extent. As a proof of concept, a series of PBAs have been prepared by co-precipitation method. And then, a novel precipitation conversion method has been designed, by which unique PBAs with a specific quantity of [Fe(CN)6 ] vacancies was successfully synthesized. Remarkably, the as-prepared PBAs possessing hierarchical hollow morphology have reached a unprecedent level of high capacity (168â
mAh g-1 at 25â
mA g-1 , close to PBAs' theoretical capacity 170â
mAh g-1 ), high rate performance (90â
mAh g-1 at 5â
A g-1 ), and high energy density (over 500â
Wh kg-1 ).
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1
Base de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China