Yang Qi, Guo Ying, Yan Boxun, Wang Changda, Liu Zhuoxin, Huang Zhaodong, Wang Yukun, Li Yiran, Li Hongfei, Song Li, Fan Jun, Zhi Chunyi
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China.
National Synchrotron Radiation Laboratory CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, 230029, China.
Adv Mater. 2020 Jun;32(25):e2001755. doi: 10.1002/adma.202001755. Epub 2020 May 14.
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 ). 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 concentration field by spatially forcing Zn 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 . This HsGDY-protection methodology represents great progress in Zn dendrite protection and demonstrates enormous potential in metal batteries.
目前的水系锌电池（ZBs）因电极表面粗糙而严重受枝晶问题困扰。尽管在延长这些电池的寿命方面付出了巨大努力，但在商业级阴极负载质量下消除枝晶方面投入的精力却很少。相反，相关演示仅在实验室水平（≤2 mg cm²）进行。此外，质子存储行为变化和界面粉化等新难题也相继出现。在此，具有亚埃级离子隧道和强大化学稳定性的氢取代石墨炔（HsGDY）被设计为一种人工界面层来解决这些问题。该策略将对称电池的寿命延长至>2400小时（100天），比无保护时（63小时）长37倍。双场模拟表明，HsGDY可以通过在空间上迫使锌偏离不规则电场来重新分布锌浓度场。在实际使用中，组装好的全电池可实现50000次循环的长寿命，即使在高达22.95 mg cm²的商业级阴极负载质量下也能保持稳定。这种HsGDY保护方法在锌枝晶保护方面取得了巨大进展，并在金属电池中展现出巨大潜力。
