Flexible fiber-shape Zn-MnO2 battery for wearable electronic devices

• Published in: Journal of energy storage Vol. 98; p. 113010
• Main Authors: Jiang, Zhuosheng, Wang, Yingying, Chen, Hedong, Zhai, Shengli, Li, Minzhang, Songsiriritthigul, Prayoon, Oo, Than Zaw, Lwin, Nyein Wint, Zaw, Mono, Hui, Kwun San, Chen, Fuming
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.09.2024
• Subjects: Flexible energy storage device; MnO2 cathode; Zn ion battery; MnO2 cathode; Flexible energy storage device; Zn ion battery
• ISSN: 2352-152X
• DOI: 10.1016/j.est.2024.113010

In the advent of the smart era, wearable electronic devices have become ubiquitous in people's lives. However, the advancement of wearable devices is impeded by the limitations of conventional commercial batteries, thus necessitating the development of a stable, safe, high flexible, and cost-effective energy storage solution to power wearable electronics. In this study, we propose a quasi-solid-state fiber-shaped Zn-MnO2 battery (FZMB) featuring a simple fabrication process, enhanced safety, efficiency, and superior mechanical performance, achieved through a three-dimensional coaxial cylindrical structure electrode. This electrode comprises a 3D carbon nanofiber (CNF) substrate, MnO2 active material, and a protective Poly(3,4-ethylene dioxythiophene) (PEDOT) layer, denoted as PEDOT@MnO2@CNF. Through meticulous optimization of the electrode structure, the PEDOT@MnO2@CNF electrode exhibits a notable capacity of 258.54 mAh g−1 at 0.1 A g−1 and exceptional rate performance, delivering 118.11 mAh g−1 at 2 A g−1 in an aqueous electrolyte. Notably, the quasi-solid-state FZMB demonstrates a substantial capacity of 123.37 mAh g−1 at 0.5 A g−1, even when employing a gel electrolyte characterized by low ionic conductivity. Furthermore, the battery exhibits a satisfactory capacity retention rate of 62 % after 100 cycles. Additionally, under simulated extreme usage scenarios, the quasi-solid-state FZMB maintains a stable power output, underscoring its high reliability and availability. With its remarkable electrochemical and mechanical properties, this highly flexible battery represents a significant advancement in the power supply for wearable electronics, opening up new avenues for their utilization. The fiber-shaped flexible solid-state battery based on the 3D coaxial cylindrical electrodes assembled for application in wearable electronic devices. Excellent mechanical properties with stable electrical output under extreme deformation. [Display omitted] •A fiber-shaped quasi-solid-state Zn-MnO2 battery is proposed with 3D coaxial cylindrical structure of PEDOT@MnO2@CNF electrode.•Achieved capacity of 258.54 mAh g-1 at 0.1 A g-1 and 118.11 mAh g-1 at 2 A g-1 in aqueous electrolyte.•The fiber-shaped quasi-solid-state battery can work well in gel electrolyte with low ionic conductivity.•The quasi-solid-state battery is able to maintain a stable power output.