What question did this study set out to answer?

The research aims to enhance the performance of Zn-ion batteries by customizing their solvation structure and solid-electrolyte interphase.

March 1, 2026

Molecular Polarity Attenuation Tailors Weak Solvation Structure with Accelerated Kinetics and Robust SEI for High-Areal-Capacity Large-Format Pouch Zn-Based Batteries.

Key Points

The research aims to enhance the performance of Zn-ion batteries by customizing their solvation structure and solid-electrolyte interphase.
Propose a molecular polarity-weakening strategy for electrolyte additives.
Customize solvation structure for rapid reaction kinetics.
Evaluate performance using Zn||Zn and Zn||I2 pouch cells.
Achieved 352 hours of stable cycling at 40 mAh cm^-2 for 25 cm^2 Zn||Zn symmetric cells.
Demonstrated a high areal capacity of 9.8 mAh cm^-2 for 100 cm^2 Zn||I2 full batteries.
Sustained nearly 400 hours of stable cycling under high capacity conditions.

Abstract

Large-format, high-areal-capacity aqueous Zn-ion batteries are pivotal for practical energy storage but remain hindered by sluggish kinetics, heterogeneous local reactions, and drastic interfacial deformation. In this work, a molecular polarity-weakening strategy of electrolyte additive is proposed to customize a rapid-reaction-kinetics solvation structure and a hybrid solid-electrolyte interphase (SEI) for Zn metal pouch batteries. Leveraging this synergistic solvation-SEI regulation, a 25 cm2 Zn||Zn pouch symmetric cell achieves unprecedent 352 h stable cycling at 40 mAh cm-2 (DOD = 68%, 10 mA cm-2). More importantly, a 100 cm2 Zn||I2 pouch full battery delivers a high areal capacity of 9.8 mAh cm-2 and sustains nearly 400 h of stable cycling.

Molecular Polarity Attenuation Tailors Weak Solvation Structure with Accelerated Kinetics and Robust SEI for High-Areal-Capacity Large-Format Pouch Zn-Based Batteries.

Key Points

Abstract

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