Flexible and High-Voltage Coaxial-Fiber Aqueous Rechargeable Zinc-Ion Battery

Abstract

Extensive efforts have been devoted to construct a fiber-shaped energystorage device to fulfill the increasing demand for power consumption of textile-based wearable electronics. Despite the myriad of available material selections and device architectures, it is still fundamentally challenging to develop eco-friendly fiber-shaped aqueous rechargeable batteries (FARBs) on a single-fiber architecture with high energy density and long-term stability. Here, we demonstrate flexible and high-voltage coaxialfiber aqueous rechargeable zinc-ion batteries (CARZIBs). By utilizing a novel spherical zinc hexacyanoferrate with prominent electrochemical performance as cathode material, the assembled CARZIB offers a large capacity of 100.2 mAh cm −3 and a high energy density of 195.39 mWh cm −3 , outperforming the state-of-the-art FARBs. Moreover, the resulting CARZIB delivers outstanding flexibility with the capacity retention of 93.2% after bending 3000 times. Last, high operating voltage and output current are achieved by the serial and parallel connection of CARZIBs woven into the flexible textile to power high-energy-consuming devices. Thus, this work provides proof-of-concept design for next-generation wearable energy-storage devices.

Recent Progress in the Electrolytes of Aqueous Zinc‐Ion Batteries

“…Zn/MnO 2 micro‐battery and cable‐type battery could also be fabricated by PVA‐based gel electrolytes . Apart from PVA, CMC, which is a widely used biomaterial, can also be used to design gel electrolytes . Compared with liquid electrolyte, the ionic diffusion of gel electrolyte is slower due to the restriction of CMC molecules.…”

“…[43b, d] Apart from PVA, CMC, which is aw idely used biomaterial, can also be used to design gel electrolytes. [44] Compared with liquid electrolyte, the ionic diffusion of gel electrolyte is slower due to the restriction of CMC molecules. However,o wing to its strong adhesiveness, the CMC-based gel electrolyte could coat integrally on the electrodes.…”

Recent Advances in Polymer Electrolytes for Zinc Ion Batteries: Mechanisms, Properties, and Perspectives

“…It can not only provide high mechanical flexibility and stability, but also exhibit aligned charge transport paths. Zhang et al108 demonstrated a flexible and coaxial‐fiber aqueous rechargeable ZIB with high voltage. As illustrated in Figure 12 a, carbon nanotube fiber (CNTF) adopting Zn nanosheet arrays (NSAs) is the inner electrode.…”

“…d) A red LED operated by the CARZIBs under 90° bending. Reproduced with permission 108. Copyright 2019, American Chemical Society.…”

Flexible Zinc‐Ion Hybrid Fiber Capacitors with Ultrahigh Energy Density and Long Cycling Life for Wearable Electronics

“…Supercapacitors based on ion adsorption or fast surface redox reactions usually have high power density but low energy density . In contrast, batteries based on diffusion‐controlled Faradic reactions have much higher energy storage capacity and lower power density . Thus, hybrid capacitors comprising of a battery‐type negative electrode and a capacitor‐type positive electrode have been explored to combine the merits of both batteries and supercapacitors .…”