Abstract
Flexible yarn- or fiber-based energy storing devices are attractive because of their small dimension, light weight, and suitability for integration into woven or textile application. Some Li-ion based yarn or fiber batteries were developed due to their performance advantages, realizing highly performing and practically safe wearable battery still remains a challenge. Here, high performance and safe yarn-based battery is demonstrated by embedding active materials into inner structure of yarn and using water based electrolyte. Thanks to biscrolling method, loading level of silver and zinc in yarn electrodes increased up to 99 wt%. Our high loaded Silver and Zinc yarn electrodes enables high linear capacity in liquid electrolyte (0.285 mAh/cm) and solid electrolyte (0.276 mAh/cm), which are significantly higher than previously reported fiber batteries. In additions, due to PVA-KOH based aqueous electrolyte, our yarn battery system is inflammable, non-explosive and safe. Consequently, these high-capacities enable our Silver-Zinc aqueous yarn battery to be applicable to the energy source of portable and wearable electronics like an electric watch.
Highlights
Flexible yarn- or fiber-based devices are attractive because of their exceptionally small dimensions, light weight, mechanical flexibility, and suitability for integration into woven or textile application, providing advantages over conventional rigid, bulky three- or two-dimensional (3D, 2D) devices[1,2,3]
Scanning electron microscope (SEM) micrographs of the cross-sectional area of the 75 μm Ag/CNT yarn showed a porous structure with a porosity around 8.6% and pores smaller than 5 μm (Fig. 1d and Fig. S1a)
Due to the metal particles used for active material and MWNT used for current collector, yarn electrodes have good electrical conductivity
Summary
Flexible yarn- or fiber-based devices are attractive because of their exceptionally small dimensions, light weight, mechanical flexibility, and suitability for integration into woven or textile application, providing advantages over conventional rigid, bulky three- or two-dimensional (3D, 2D) devices[1,2,3] Such advantages have inspired a lot of recent researches that have focused on the development of fiber based energy storage device such as supercapacitors[4,5,6,7,8,9] and Li-ion batteries[3,10,11,12,13,14,15]. Due to high active material loading, Ag-Zn aqueous yarn battery showed high linear capacity in liquid electrolyte (CL = 0.285 mAh/cm) and solid electrolyte (CL = 0.276 mAh/cm), which are significantly higher than previously reported fiber batteries These high-capacities enable our yarn battery to be applicable to the energy source of portable and wearable electronics like an electric watch
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