Stable anode enabled by an embossed and punched structure for a high‐rate performance Zn‐ion hybrid capacitor

Abstract

Summary Zinc (Zn)‐ion hybrid capacitors (ZICs) have been considered as the next‐generation energy storage technology due to their high energy density and excellent safety. However, ZICs still have serious challenges in overcoming the poor rate performance and low long‐term stability at high current density related to the inefficient use of the interface between the Zn anode and electrolyte, along with the poor wettability of the electrode, which lead to the growth of uniform Zn dendrites on the anode surface. To address these drawbacks, an advanced surface‐engineering approach is presented herein, involving a uniform, embossed, and punched anode structure. The as‐fabricated ZIC exhibits a superb energy storage performance and reversibility, with improved energy densities of 108 and 69 W h kg−1 at 450 and 9000 W kg−1, and an excellent fast long‐term stability, with a capacity retention of 90% during 10 000 cycles at 10.0 A g−1. These findings suggest that advanced surface engineering is an influential tool for the next‐generation ZICs.

Zinc‐ion hybrid supercapacitors: Design strategies, challenges, and perspectives

“…One simple and exciting process, embossing and punching commercial zinc foil to form furrows and macropores using steel mesh and a roll press, provided a stable surface for uniform Zn plating and achieved good rate performance and cycling stability. [80] The fabrication of hierarchical nanostructures can decrease the overpotential of diffusion-controlled stripping/deposition and improve the reaction kinetics after long cycling by providing more active sites, lowering the local current density, and homogenizing the localized electrical field to inhibit zinc dendrites. Various carbon substrates, including graphite fibers and AC, have been chosen as hosts for Zn coating in ZHSCs due to their chemical and electrochemical permanence, good conductivity, and superior mechanical stability.…”

Hierarchical Porous Doped Carbon Plates Derived from Chitosan Aerogel as Cathode for High Performance Zn‐ion Hybrid Capacitor

“…Among various electrochemical energy storage devices, supercapacitors have attracted great interest in recent years duo to their ultrahigh power density, long cycle life, high reliability as well as good safety [1,2] . However, the energy density of supercapacitors based on ion adsorption is much lower than those of batteries based on Faradic reactions [3–5] . Thus, the hybrid supercapacitors, which integrate battery‐type electrode with electric double‐layer capacitive electrode, can achieve higher energy density than conventional supercapacitors and higher power density than batteries.…”

“…[1,2] However, the energy density of supercapacitors based on ion adsorption is much lower than those of batteries based on Faradic reactions. [3][4][5] Thus, the hybrid supercapacitors, which integrate battery-type electrode with electric double-layer capacitive electrode, can achieve higher energy density than conventional supercapacitors and higher power density than batteries. Many progresses have been made in the field of the hybrid supercapacitors based on monovalent ions (e. g., Li + , Na + and K + ) and multivalent ions (e. g., Mg 2 + , Zn 2 + , Ni 2 + , Ca 2 + , and Al 3 + ).…”

Freestanding V 5 O 12 · 6H 2 O‐CNTs composite films as cathode for foldable aqueous zinc‐ion batteries

“…Considering these factors, researchers would like to choose aqueous zinc-ion battery (AZIBs), which has the advantages of high abundance, good safety, good flammability resistance and high ionic conductivity. [4][5][6][7][8][9] Nowadays, many cathode materials are being explored, such as manganese oxides, Prussian blue analogs, and vanadium-based compounds. [9][10][11][12][13] Among these potential cathode materials, the layered structure of vanadium oxide has attracted attention as one of the most promising cathode materials in AZIBs owing to vanadium oxide with a larger interlayer spacing for the high charge-radius ratio of Zn 2+ insertion.…”

“…Meanwhile, combustible organic electrolytes cannot achieve safety under foldable conduction. Considering these factors, researchers would like to choose aqueous zinc‐ion battery (AZIBs), which has the advantages of high abundance, good safety, good flammability resistance and high ionic conductivity 4‐9 . Nowadays, many cathode materials are being explored, such as manganese oxides, Prussian blue analogs, and vanadium‐based compounds 9‐13 .…”