Regulating Zn2+ Migration-Diffusion Behavior by Spontaneous Cascade Optimization Strategy for Long-Life and Low N/P Ratio Zinc Ion Batteries.
Angew Chem Int Ed Engl
; : e202407194, 2024 May 31.
Article
em En
| MEDLINE
| ID: mdl-38818621
ABSTRACT
Parasitic side reactions and dendrite growth on zinc anodes are formidable issues causing limited lifetime of aqueous zinc ion batteries (ZIBs). Herein, a spontaneous cascade optimization strategy is first proposed to regulate Zn2+ migration-diffusion behavior. Specifically, PAPE@Zn layer with separation-reconstruction properties is constructed in situ on Zn anode. In this layer, well-soluble poly(ethylene oxide) (PEO) can spontaneously separation to bulk electrolyte and weaken the preferential coordination between H2O and Zn2+ to achieve primary optimization. Meanwhile, poor-soluble polymerized-4-acryloylmorpholine (PACMO) is reconstructed on Zn anode as hydrophobic flower-like arrays with abundant zincophilic sites, further guiding the de-solvation and homogeneous diffusion of Zn2+ to achieve the secondary optimization. Cascade optimization effectively regulates Zn2+ migration-diffusion behavior, dendrite growth and side reactions of Zn anode are negligible, and the stability is significantly improved. Consequently, symmetrical cells exhibit stability over 4000â
h (1â
mA cm-2). PAPE@Zn//NH4 +-V2O5 full cells with a high current density of 15â
A g-1 maintains 72.2 % capacity retention for 12000â
cycles. Even better, the full cell demonstrates excellent performance of cumulative capacity of 2.33â
Ah cm-2 at ultra-low negative/positive (N/P) ratio of 0.6 and a high mass-loading (~17â
mg cm-2). The spontaneous cascade optimization strategy provides novel path to achieve high-performance and practical ZIBs.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2024
Tipo de documento:
Article