Abstract
The flexibility and safety of energy storage devices have drawn wide attention due to rapid development of wearable electronics. Silver-zinc (Ag–Zn) battery are one of the promising aqueous zinc-based battery with non-toxic environment, stable output voltage and high energy density. Flexible electrode plays a key role in excellent mechanical and electrochemical properties of batteries. In this work, silver nanoparticles/carbon nanotubes-graphite paper (AgNP/CNT-Gp) cathode is prepared by double-side coating on graphite paper. The mixed silver nanoparticles and carbon nanotubes construct a 3D spatial conductive network to contribute excellent electrochemical performance for Ag–Zn battery. The quasi-solid-state Ag–Zn battery shows area specific capacity of 1.268 mAh/cm2 and excellent energy density of 1.913 mWh/cm2 at current density of 1 mA/cm2. The battery not only represents superior electrochemical properties, but also demonstrates perfect flexibility. We use the quasi-solid-state Ag–Zn battery to successfully light up an indicator composed of 9 LED bulbs, which can still work when the battery is completely folded.
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