Electrostatic Shielding Boosts Electrochemical Performance of Alloy-Type Anode Materials of Sodium-Ion Batteries.
Angew Chem Int Ed Engl
; 62(14): e202214258, 2023 Mar 27.
Article
en En
| MEDLINE
| ID: mdl-36451256
ABSTRACT
The applications of alloy-type anode materials for Na-ion batteries are always obstructed by enormous volume variation upon cycles. Here, K+ ions are introduced as an electrolyte additive to improve the electrochemical performance via electrostatic shielding, using Sn microparticles (µ-Sn) as a model. Theoretical calculations and experimental results indicate that K+ ions are not incorporated in the electrode, but accumulate on some sites. This accumulation slows down the local sodiation at the "hot spots", promotes the uniform sodiation and enhances the electrode stability. Therefore, the electrode maintains a high specific capacity of 565â
mAh g-1 after 3000 cycles at 2â
A g-1 , much better than the case without K+ . The electrode also remains an areal capacity of ≈3.5â
mAh cm-2 after 100 cycles. This method does not involve time-consuming preparation, sophisticated instruments and expensive reagents, exhibiting the promising potential for other anode materials.
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MEDLINE
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En
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Angew Chem Int Ed Engl
Año:
2023
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Article