Zinc-iodine battery-capacitor hybrid device with excellent electrochemical performance enabled by a robust iodine host. (June 2023)

• Record Type: Journal Article
• Authors: Sun, Zhaorui; Han, Xinliang; Wang, Dewei
• Is Part Of: Journal of energy storage. Volume 62(2023)
• Publication Date: 2023-06
• Subjects: Zinc‑iodine batteries -- Zinc-ion hybrid capacitors -- Battery-supercapacitor hybrid device -- Porous carbons -- Iodine host material; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2023.106857
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: From both the cost and safety point of view, aqueous rechargeable zinc-ion based electrochemical energy storage devices are highly attractive as a substitute for lithium-ion batteries. The development of zinc‑iodine battery-capacitor hybrid devices (ZIBCHDs) properly integrated with zinc‑iodine batteries (ZIBs) and zinc-ion hybrid capacitors (ZICs) are desired to endure both the large energy density of ZIBs and the high-power density of ZICs. We demonstrated herein an N-doped porous carbon framework (3D) decorated with nanosheets (2D) hybrids can serve as a robust iodine host. Benefitting from its unique 3D2D microstructure, large BET surface area, and abundant surface functional groups, the resulting porous carbon/iodine cathodes can display battery level specific capacity and energy density as well as a supercapacitor level rate capability and cycle stability. The optimized cathode delivers a large reversible specific capacity of 291.5 mAh g −1 at 0.5 A g −1, which is much larger than the corresponding ZIBs (163.8 mAh g −1 ) and ZICs (148.9 mAh g −1 ) revealing the broadening potential window can effectively utilize carbon scaffold to further boost the specific capacity. Additionally, the energy storage mechanism was fully explored through a series of ex-situ testing techniques, and a combination of physical/chemical adsorption-desorption and redox reactions mechanism has been proposed. Graphical abstract: Unlabelled Image Highlights: zinc-iodine battery-capacitor hybrid devices have been developed. N-doped porous carbon framework decorated with nanosheets hybrids have been prepared. potassium acid tartrate can act as a mild chemical activator in the presence of NaCl. The resulting samples has large specific surface area. The resulting devices display excellent electrochemical performance.