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"AFM" by Tang Weihua of Nanjing University of Science and Technology: Controlling triquinoline-based polymer electrodes to achieve 1500 cycles of aqueous zinc-ion batteries

 Last Update: 2023-03-01
 Source: Internet
 Author: User

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Aqueous zinc-ion batteries (ZIBs) with safety and cost advantages are increasingly promising for energy storage; meanwhile, organic electrodes have attracted considerable interest
.
The development of organic ZIBs is aimed at addressing the challenging problem of hindering the interfacial diffusion of Zn2+ and the corresponding slow reaction kinetics
.

In view of this, Professor Weihua Tang from Nanjing University of Science and Technology designed and prepared a triquinoline (3Q)-based homopolymer (P3Q) and a triazine-linked 3Q polymer (P3Q-t) with enlarged conjugation planes to reveal the molecular structure The effect of type on Zn2+ transfer and coordination kinetics
.
This work systematically investigates their ZIBs properties and ion intercalation mechanism through structural characterization, electrochemical tests, and theoretical calculations
.
Specifically, P3Q showed interaction with Zn2+ and H+, while P3Q-t was found to coordinate selectively with Zn2+ only
.
Furthermore, due to intermolecular and intramolecular effects, P3Q-t exhibits high conjugation planarity and electronegativity fused-ring pathways, which lead to faster reaction kinetics and reduced Zn transfer resistance
.
Therefore, P3Q-t provides a high capacity of 237 mAh g-1 at 0.
3 A g-1
.
What's more, this capacity can be maintained at 45% at 15 A g-1 and an average of 81% after 1500 cycles
.

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