Hydrogen‐Substituted Graphdiyne Ion Tunnels Directing Concentration Redistribution for Commercial‐Grade Dendrite‐Free Zinc Anodes. Issue 25 (14th May 2020)

• Record Type: Journal Article
• Authors: Yang, Qi; Guo, Ying; Yan, Boxun; Wang, Changda; Liu, Zhuoxin; Huang, Zhaodong; Wang, Yukun; Li, Yiran; Li, Hongfei; Song, Li; Fan, Jun; Zhi, Chunyi
• Is Part Of: Advanced materials. Volume 32:Issue 25(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-05-14
• Subjects: artificial interfaces -- concentration fields -- graphdiyne -- ion tunnels -- Zn dendrites; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202001755
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Current aqueous Zn batteries (ZBs) seriously suffer from dendrite issues caused by rough electrode surfaces. Despite significant efforts in prolonging lifespan of these batteries, little effort has been devoted to dendrite elimination in commercial‐grade cathode loading mass. Instead, demonstrations have only been done at the laboratory level (≤2 mg cm −2 ). Additionally, new dilemmas regarding change of the proton‐storage behavior and interface pulverization have emerged in turn. Herein, hydrogen‐substituted graphdiyne (HsGDY), with sub‐ångström level ion tunnels and robust chemical stability, is designed as an artificial interface layer to address these issues. This strategy prolongs the symmetric cell lifespan to >2400 h (100 days), which is 37 times larger than without protection (63 h). The simulation of dual fields reveals that HsGDY can redistribute the Zn 2+ concentration field by spatially forcing Zn 2+ to deviate from the irregular electric field. During practical use, the as‐assembled full batteries deliver a long lifespan 50 000 cycles and remain stable even at a commercial‐grade cathode loading mass of up to 22.95 mg cm −2 . This HsGDY‐protection methodology represents great progress in Zn dendrite protection and demonstrates enormous potential in metal batteries. Abstract : Aqueous Zn‐based batteries suffering from the dendrite issue show a short lifespan, especially at commercial‐grade cathode loading mass. Hydrogen‐substituted graphdiyne with ion tunnels is employed to eliminate dendrites, based on ion redistribution, achieving a long lifespan of 10 000 cycles at a cathode loading mass of 22.95 mg cm −2 . This work sheds light on tackling the dendrite issue encountered by metal batteries.