Amorphous Bimetallic Co<sub>3</sub>Sn<sub>2</sub> Nanoalloys
Are Better Than Crystalline Counterparts for Sodium Storage
- Publication date
- Publisher
Abstract
Sodium-ion batteries are considered
as a promising alternative
to replace the existing lithium-ion batteries for energy storage due
to the benefits of low cost and safety. However, it is still challenging
to develop suitable electrode materials for reversible storage of
sodium. Metal anodes have high capacity for sodium storage but suffer
the issue of poor cyclability due to pulverization caused by large
volume variation and electrode disintegration. To address this issue,
amorphous bimetallic active–inactive nanoalloy Co–Sn
with Sn acting as a high capacity active compound and Co acting as
a conductive inactive matrix has been explored here. We demonstrated
that amorphous nanoalloys exhibited superior electrochemical performances
as compared to the low-crystalline and crystalline counterpart nanoalloys
as negative electrode materials for sodium-ion batteries. The degree
of crystallinity has negative effects on electrochemical performances.
The improved performance of amorphous nanoalloys could be attributed
to the easy accessibility for sodium ions, strain accommodation, and
defect sites to host sodium ions