Crystal Plane Reconstruction and Thin Protective Coatings Formation for Superior Stable Zn Anodes Cycling 1300 h. Issue 22 (2nd May 2022)

• Record Type: Journal Article
• Authors: Liu, Mengke; Cai, Jinyan; Xu, Jun; Qi, Kaiwen; Wu, Qianyao; Ao, Huaisheng; Zou, Tiansheng; Fu, Shengquan; Wang, Shuqing; Zhu, Yongchun
• Is Part Of: Small. Volume 18:Issue 22(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-02
• Subjects: crystal plane reconstruction -- hydrogen evolution -- metal anticorrosion -- planar deposition -- Zn metal anodes; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202201443
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Some new insights into traditional metal pretreatment of anticorrosion for high stable Zn metal anodes are provided. A developed pretreatment methodology is employed to prefer the crystal plane of polycrystalline Zn and create 3.26 µm protective coatings mainly consisting of organic polymers and zinc salts on Zn foils (ROZ@Zn). In this process, Zn metal exhibits a surface‐preferred (001) crystal plane proved by electron backscattered diffraction. Preferred (001) crystal planes and ROZ coatings can regulate Zn 2+ diffusion, promote flat growth of Zn, and prevent side reactions. As a result, ROZ@Zn symmetrical cells exhibit superior plating/stripping performance over 1300 h. Impressively, it is significantly prolonged over 40 times in comparison to the bare Zn symmetric cell at 5 mA cm ‐2 . Moreover, Zn//MnO2 button cells have a high capacity retention of 96.3% after 1600 cycles and pouch cells have a high capacity 122 mAh g ‐1 after 200 cycle at 5 C. This work provides inspiration for high stable aqueous Zn metal batteries using the developed metal pretreatment of anticorrosion, which will be a viable, low‐cost, and efficient technology. More interesting, it demonstrates the availability of reconstructing crystal planes by the largely heterogeneous reaction activation of the different crystal planes to H + . Abstract : A developed pretreatment methodology is employed to prefer the crystal plane of polycrystalline Zn and create thin protective coatings with thickness of 3.26 μm on Zn foils, which can regulate Zn 2+ diffusion, promote flat growth of Zn, and prevent side reactions. Superior long cycling stability is also achieved in both symmetrical cells and full cells.