Multifunctional SEI-like structure coating stabilizing Zn anodes at a large current and capacity. Issue 1 (20th December 2022)

• Record Type: Journal Article
• Authors: Chen, Aosai; Zhao, Chenyang; Gao, Jiaze; Guo, Zhikun; Lu, Xingyuan; Zhang, Jiachi; Liu, Zeping; Wang, Ming; Liu, Nannan; Fan, Lishuang; Zhang, Yu; Zhang, Naiqing
• Is Part Of: Energy & environmental science. Volume 16:Issue 1(2023)
• Page Start: 275
• Page End: 284
• Publication Date: 2022-12-20
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/d2ee02931f
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : The SEI-like structure coating can combine the advantages of each component and give sufficient mechanical stability to the coating. The establishment of fast Zn 2+ migrating pathway supports the cycling of the anode at large current and capacity. Abstract : The development and application of aqueous zinc-ion batteries still face some obstacles, such as dendrite growth and side reactions triggered by active water. Here, we constructed a PVA@SR-ZnMoO4 multifunctional coating on the Zn anode with an SEI-like structure (SR refers to SO4 2− receptor). The PVA@SR outer layer can give the coating some flexibility while enhancing Zn 2+ mobility and dispersion. The ZnMoO4 inner layer can effectively inhibit dendrite growth and side reactions. Importantly, a fast Zn 2+ migration pathway can be established between PVA and ZnMoO4 in the inorganic–organic composite inner layer, ensuring high-current operation of the Zn anode. Thanks to the "mutual cooperation", the Zn anode exhibits a high Coulomb efficiency (CE) of 99.42% and good cycling stability of 1700 h at 5 mA cm −2 and 5 mA h cm −2 . Moreover, the Zn/α-MnO2 full cell can maintain a residual capacity of 141.7 mA h g −1 without capacity decay after 1000 cycles at 1.0 A g −1 .