Liu Nannan, Wu Xian, Zhang Yu, Yin Yanyou, Sun Chengzhi, Mao Yachun, Fan Lishuang, Zhang Naiqing
School of Chemistry and Chemical Engineering State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150001 China.
Academy of Fundamental and Interdisciplinary Sciences Harbin Institute of Technology Harbin 150001 China.
Adv Sci (Weinh). 2020 Jun 25;7(14):2000146. doi: 10.1002/advs.202000146. eCollection 2020 Jul.
Aqueous zinc-ion batteries (ZIBs) are an alternative energy storage system for large-scale grid applications compared with lithium-ion batteries, when the low cost, safety, and durability are taken into consideration. However, the reliability of the battery systems always suffers from the serious challenge of the large Zn dendrite formation and "dead Zn," thus bringing out the inferior cycling stability, and even cell shorting. Herein, a dendrite-free organic anode, perylene-3,4,9,10-tetracarboxylic diimide (PTCDI) polymerized on the surface of reduced graphene oxide (PTCDI/rGO) utilized in ZIBs is reported. Moreover, the theoretical calculations prove the reason for the low redox potential. Due to the protons and zinc ions coparticipant phase transfer mechanism and the high charge transfer capability, the PTCDI/rGO electrode provides superior rate capability (121 mA h g at 5000 mA g, retaining the 95% capacity of that compared with 50 mA g) and a long cycling life span (96% capacity retention after 1500 cycles at 3000 mA g). In addition, the proton coparticipation energy storage mechanism of active materials is elucidated by various ex-situ methods.
考虑到低成本、安全性和耐用性，水系锌离子电池（ZIBs）是一种可用于大规模电网应用的替代储能系统，可与锂离子电池相媲美。然而，电池系统的可靠性一直受到严重挑战，即会形成大量锌枝晶和“死锌”，从而导致循环稳定性较差，甚至电池短路。在此，报道了一种用于水系锌离子电池的无枝晶有机阳极，即聚合在还原氧化石墨烯（PTCDI/rGO）表面的苝-3,4,9,10-四羧酸二亚胺（PTCDI）。此外，理论计算证明了其氧化还原电位较低的原因。由于质子和锌离子共同参与的相转移机制以及高电荷转移能力，PTCDI/rGO电极具有优异的倍率性能（在5000 mA g下为121 mA h g，与50 mA g相比保留了95%的容量）和长循环寿命（在3000 mA g下1500次循环后容量保持率为96%）。此外，通过各种非原位方法阐明了活性材料的质子共同参与储能机制。
