Intramolecular Hydrogen Bond Improved Durability and Kinetics for Zinc-Organic Batteries
Tianjiang Sun, Jun Pan, Weijia Zhang, Xiaodi Jiang, Min Cheng, Zhengtai Zha, Hong Jin Fan, Zhanliang Tao
Abstract
Abstract Organic compounds have the advantages of green sustainability and high designability, but their high solubility leads to poor durability of zinc-organic batteries. Herein, a high-performance quinone-based polymer (H-PNADBQ) material is designed by introducing an intramolecular hydrogen bonding (HB) strategy. The intramolecular HB (C=O⋯N–H) is formed in the reaction of 1,4-benzoquinone and 1,5-naphthalene diamine, which efficiently reduces the H-PNADBQ solubility and enhances its charge transfer in theory. In situ ultraviolet–visible analysis further reveals the insolubility of H-PNADBQ during the electrochemical cycles, enabling high durability at different current densities. Specifically, the H-PNADBQ electrode with high loading (10 mg cm −2 ) performs a long cycling life at 125 mA g −1 (> 290 cycles). The H-PNADBQ also shows high rate capability (137.1 mAh g −1 at 25 A g −1 ) due to significantly improved kinetics inducted by intramolecular HB. This work provides an efficient approach toward insoluble organic electrode materials.