A Dynamic and Self‐Adapting Interface Coating for Stable Zn‐Metal Anodes. Issue 2 (12th November 2021)

• Record Type: Journal Article
• Authors: Guo, Zhikun; Fan, Lishuang; Zhao, Chenyang; Chen, Aosai; Liu, Nannan; Zhang, Yu; Zhang, Naiqing
• Is Part Of: Advanced materials. Volume 34:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-12
• Subjects: dynamic -- interface coating -- Zn dendrites -- Zn metal; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202105133
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: The zinc (Zn)‐ion battery has attracted much attention due to its high safety and environmental protection. At present, the critical issues of the generation of dendrites and the accumulation of dead Zn on the surface will lead to a sharp decline of the battery life. Zn dendrites can be inhibited to some extent by constructing an interface protective coating. However, the existing rigid coating method cannot maintain conformal contact with Zn due to the volume change of Zn deposition and will cause fracture irreversibly during the cycle. Here, a highly self‐adaptable poly(dimethylsiloxane) (PDMS)/TiO2− x coating is developed that can dynamically adapt to volume changes and inhibit dendrites growth. PDMS has high dynamic and self‐adaptability due to the crosslinking of the B–O bond. In addition, the rapid and uniform transfer of Zn 2+ is induced by the oxygen‐vacancy‐rich TiO2− x . The assembled cells still achieve 99.6% coulombic efficiency after 700 cycles at a current density of 10 mA cm −2 . The adaptive interface coating constructed provides a sufficient guarantee for the stable operation of the Zn anode. Abstract : A novel strategy is proposed for constructing a dynamic and adaptive volume change interface coating to stabilize zinc anodes and prepare poly(dimethylsiloxane) (PDMS)/TiO2− x as a reasonable artificial interface coating, which can provide continuous dynamic protection and induce rapid and uniform transfer of Zn 2+ . This provides an effective and feasible approach for the protection and practical application of zinc‐metal anodes.