Building Microcracked Structure Fibrous Cathode Coated by Pedot:Pss for Ultra-Stable Fiber-Shaped Aqueous Zinc Ions Batteries

Abstract

Fiber-shaped aqueous zinc ions batteries (FAZIBs) deliver considerable underlying adhibition in flexible and wearable electronic devices, serving as energy supply devices attributing to their intrinsic safety, admirable energy density, superb omnidirectional flexibility, and outstanding power density. Nevertheless, the shedding of active substances caused by bending stress during the bending status would seriously restrict their practical application. To address the above knotty issue, an effective strategy integrated microcracked activated cobalt hydroxide [A-Co(OH)2] cathode with poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) (PEDOT:PSS) protective coat was put forward by this innovative work to enhance the cyclic and bending performances of FAZIBs. The microcracked A-Co(OH)2 cathode can alleviate the stress concentration caused by bending conditions, while the PEDOT:PSS protective coat maintains configurable integrity and prevents the shedding of A-Co(OH)2. Benefiting from the synergistic effect of microcracked A-Co(OH)2 cathode and the PEDOT:PSS protective coat, the FAZIBs based on gel electrolyte offered an outstanding energy density(173.5 Wh·kg-1) at a power density(90 W·kg-1) and outstanding bending durability (94.4% after 500 cycles). Consequently, the present work not only presents a novel approach to designing high-performance FAZIBs but also stimulate inspirations the development of highly flexible and steady fiber-shaped batteries.

Keywords: fiber-shaped Zn ions batteries, microcracked structure, activated Co(OH)2, protective layer, quasi-solid-state electrolytes