Ultrathin Surface Coating of Conductive and Zincophilic Titanium Oxynitride Interphase for Stable Zinc Metal Anode

Le résumé fourni par la source

The lifespan of aqueous zinc ion batteries (AZIB) has been hindered by the instability of zinc anodes, encountering challenges such as ir-regular dendritic growth, corrosion and hydrogen evolution reactions. Here, an ultrathin conductive titanium oxynitride (TiN x O y ) layer with rich zincophilic sites is constructed by a high-precision and atomic-scale controlled atomic layer deposition (ALD) technique for sta-bilizing the Zn anode. The TiN x O y layer acts as a bi-functional barrier, effectively isolating metal zinc from the electrolyte and thereby mitigating spontaneous corrosion and hydrogen evolution reaction of the Zn anode. Additionally, it enhances zincophilic sites and ho-mogenizes the distribution of interfacial electric field, facilitating uniform plating and stripping of Zn at the anode. Consequently, the TiN x O y @Zn anode exhibits significantly reduced over-potential and long-term cycling stability over 1300 h at 1 mA cm -2 in symmetric cell. The full cell is assembled with a TiN x O y @Zn anode and MnO 2 cathode, achieving a capacity of 85.3 mAh g -1 after 4500 cycles at 10 C.

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