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Sci Rep. 2018 Jul 24;8(1):11150. doi: 10.1038/s41598-018-29266-0.

Biscrolled Carbon Nanotube Yarn Structured Silver-Zinc Battery.

Author information

1
Center for Self-Powered Actuation, Department of Biomedical Engineering, Hanyang University, Seoul, 04763, Korea.
2
Division of Smart Textile Convergence Research, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Korea.
3
The Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX, 75083, USA.
4
Center for Self-Powered Actuation, Department of Biomedical Engineering, Hanyang University, Seoul, 04763, Korea. sjk@hanyang.ac.kr.

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.

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