A High Capacity p‐Type Organic Cathode Material for Aqueous Zinc Batteries
Yan Zhang, Min Li, Zongyang Li, Yongyi Lu, Houmou Li, Jiaxin Liang, Xinyu Hu, Libin Zhang, Kun Ding, Qunjie Xu, Haimei Liu, Yonggang Wang
Abstract
Abstract P‐type organic cathode materials typically exhibit high redox potentials and fast redox kinetics, presenting broad application prospects in aqueous zinc batteries (AZBs). However, most of the reported p‐type organic cathode materials exhibit limited capacity (<100 mAh g −1 ), which is attributable to the low mass content ratio of oxidation‐reduction active functional groups in these materials. Herein, we report a high‐capacity p‐type organic material, 5,12‐dihydro‐5,6,11,12‐tetraazatetracene (DHTAT), for aqueous zinc batteries. Both experiments and calculation indicate the charge storage of DHTAT mainly involves the adsorption/desorption of ClO 4 − on the −NH− group. Benefitting from the high mass content ratio of the −NH− group in DHATA molecule, the DHATA electrode demonstrates a remarkable capacity of 224 mAh g −1 at a current density of 50 mA g −1 with a stable voltage of 1.12 V. Notably, after 5000 cycles at a high current density of 5 A g −1 , DHTAT retains 73 % of its initial capacity, showing a promising cycling stability. In addition, DHTAT also has good low‐temperature performance and can stably cycle at −40 °C for 4000 cycles at 1 A g −1 , making it a competitive candidates cathode material for low‐temperature batteries.