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Polysaccharide Hydrogel Electrolytes with Robust Interfacial Contact to Electrodes for Quasi-solid State Flexible Aqueous Zinc Ion Batteries with Efficient Suppressing of Dendrite Growth by Yongqi Deng; Yihan Wu; Lele Wang; Kefu Zhang; Yu Wang; Lifeng Yan is a Chemistry article available to read on EtoBox.

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Flexible aqueous zinc-ion batteries (AZIBs) require high conductive and adhesive hydrogel electrolytes. However, high adhesion tends to hinder ion conduction rate. Herein, we designed a water/glycerol binary solvent coordinating the hydrophilic polymers to reconstruct the water molecules' environment in the hydrogel. As a consequence, the interface adhesion strength between Zn and the hydrogel reached 3.0 kPa and the ionic conductivity was up to 16.8 mS cm. In addition, inspired by the slurry electrode preparation method, we developed a simple blade coating technique using a non-Newtonian polysaccharide liquid solution to construct an ultra-thin hydrogel electrolyte in situ on the cathode. The thickness of the obtained hydrogel reached 70 μm, and the ultrathin flexible AZIBs were easily constructed by pasting a Zn anode directly on the adhesive hydrogel, showing the potential of flexible AZIBs scalable assembly. In addition, the Zn//Zn symmetrical cells with the hydrogel electrolyte provided stable cycling performance for over 400 h at 0.1 mA cm with suppressed dendrite growth. The assembled Zn//Polyaniline battery and Zn//VO battery also exhibited excellent capacity retention afte

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Author

Yongqi Deng; Yihan Wu; Lele Wang; Kefu Zhang; Yu Wang; Lifeng Yan

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Chemistry (Physical Sciences)