As a key component of the battery, the electrolyte determines the ion transport and interface chemistry of the positive and negative electrodes. Recently, scientific researchers developed a dual network structure hydrogel electrolyte composed of polyacrylamide (PAM), sodium alginate (SA) and potassium iodide (KI) for solid zinc-air/iodide mixed batteries. The assembled hybrid battery exhibits excellent renewability and 110 hours long cycle life and 80% high energy efficiency . The dual network structure of ion crosslinking of ionic crosslinking enables the material to have higher mechanical strength and higher ionic conductivity. More importantly, the introduction of iodine substances not only provides cathode kinetics for iodide/iodate redox that is more favorable than oxygen electrocatalysis, but also regulates the solvation structure of zinc ion to ensure better interface stability. This work provides an important concept for the development of new solid-state electrolytes to enable high-performance energy equipment and technologies.
Figure 1. (a) synthesis process, (b) ion transport diagram, (c) FESEM image, and (d) FT-IR spectra of PAM/SA/KI hydrogel.
Figure 4. (a) LSV curve of Pt/C+RuO2 composite in different O2 or Ar saturated electrolytes at 5 mV s-1. (b) UV-visible spectrum of KOH/Zn(Ac) KI solution at different charging/discharge times. (c) SEM image of circulating zinc anode for zinc air/iodide mixed battery. (d) Raman spectrum of different electrolytes.
related papers are published in Dual-Network Structured Hydrogel Electrolytes Engaged Solid-State Rechargeable Zn-Air/Iodide Hybrid Batteries in "Angewandte Chemie International Edition". Corresponding author is Huazhong University of Science and Technology Professor Xia Baoyu .
References:
doi.org/10.1002/anie.202210567
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