Weak Solvation Effect Induced Optimal Interfacial Chemistry Enables Highly Durable Zn Anodes for Aqueous Zn-Ion Batteries.
Angew Chem Int Ed Engl
; 63(6): e202317302, 2024 Feb 05.
Article
em En
| MEDLINE
| ID: mdl-38116830
ABSTRACT
Aqueous zinc-ion batteries (AZIBs) are emerging as one of the most reliable energy storage technologies for scale-up applications, but still suffer from the instability of Zn anode, which is mainly caused by the undesirable dendrite growth and side reactions. To tackle these issues, we formulate a new aqueous electrolyte with weak solvation effect by introducing low-dielectric-constant acetone to achieve H2 O-poor solvation structure of Zn2+ . Experimental and theoretical calculation studies concurrently reveal that such solvation structure can i)â
relieve the solvated H2 O related side reactions, ii)â
suppress the dendrite growth by boosting the desolvation kinetics of Zn2+ and iii)â
in situ form solid electrolyte interface (SEI) to synergistically inhibit the side reaction and dendrite growth. The synergy of these three factors prolongs the cycling life of Cu/Zn asymmetric cell from 30â
h to more than 800â
h at 1â
mA cm-2 /1â
mAh cm-2 , and can work at more harsh condition of 5â
mA cm-2 /5â
mAh cm-2 . More encouragingly, Zn/V2 O5 â
nH2 O full cell also shows enhanced cycling stability of 95.9 % capacity retention after 1000â
cycles, much better than that with baseline electrolyte (failing at ≈700th â
cycle).
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2024
Tipo de documento:
Article