Interfacial Molecule Engineering Builds Tri‐Functional Bilayer Silane Films with Hydrophobic Ion Channels for Highly Stable Zn Metal Anode

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 24, 2025

Abstract The vulnerable Zn electrode interface with uncontrolled dendrite growth and severe parasitic side reactions constrains the practical application of aqueous zinc‐ion batteries (AZIBs). General engineering offers a promising approach to relieve these issues but is limited by confined functionality, low affinity, additional weight protective layer. In this study, bilayer silane film (SF) developed hydrophobic, ion‐buffering, strong interfacial adhesion properties through precise assembly coupling agents. well‐designed SF layer enables 2+ undergo continuous processes, including being captured –CF 3 groups, followed in sequence inducing desolvation, directed diffusing nanochannels, buffered diffusion. This multiple process contributed accelerated [Zn(H 2 O) 6 ] stabilized transport, inhibited reactions. Consequently, dendrite‐free highly reversible SF@Zn anodes are realized, exhibiting an ultra‐long lifetime (more than 4300 h), high Coulombic efficiency (CE) (99.1% after 2600 cycles), superior full cell capacity retention (83.2% 1000 cycles). innovative strategy provides novel method enhance anode stability via molecular‐level design multicomponent reaction, offering new insights into advanced for AZIBs.

Язык: Английский

Hierarchical Ag Coating on Active Zinc Metal Powder Anodes via Galvanic Replacement for High‐Performance Aqueous Zn‐Ion Batteries

Small Structures, Год журнала: 2025, Номер unknown

Опубликована: Апрель 15, 2025

The energy storage performance of aqueous Zn‐ion batteries (AZIBs) is heavily influenced by the condition Zn metal anode. While using powder (ZnMP) with a larger surface area, as opposed to foil, can enhance density AZIBs, it also introduces surface‐related stability challenges. increased area ZnMP leads more severe side reactions induced free water and protruding dendrite growth, negatively impacting long‐term cyclability. To address these issues, Ag nanosheets (AgNSs) controlled size are uniformly coated onto via simple galvanic replacement reaction (GRR) between Zn. Additionally, trisodium citrate dihydrate (TCD) used stabilizer (a metal‐chelating agent) regulate GRR rate. slower rate introduced TCD ensures uniform even deposition AgNSs over ZnMP. resulting AgNS‐coated (Ag@ZnMP) anodes exhibit superior electrochemical properties, including higher densities, reduced hydrogen evolution, improved cycling. A Ag@ZnMP symmetric cell demonstrates outstanding operational stability, maintaining for 800 h at current 2 mA cm −2 capacity 1 mAh . Furthermore, Ag@ZnMP||MnO full‐cell substantially enhances overall battery performance.

Язык: Английский