Constructing a High-Performance Aqueous Rechargeable Zinc-Ion Battery Cathode with Self-Assembled Mat-like Packing of Intertwined Ag(I) Pre-Inserted V3O7·H2O Microbelts with Reduced Graphene Oxide Core

• DOI: 10.1021/acssuschemeng.0c06147
• Publication Date: 2021-03-10T16:54:51Z
• Authors: Rangaswamy Puttas...; Radha Nagaraj; Pranav Kulkarni; Hemanth Kumar Beere; Shrish Nath Upadhyay; R. Geetha Balakri...; Nataraj Sanna Kot...; Srimanta Pakhira; Debasis Ghosh
• Keywords: Orthorhombic crystal system

Orthorhombic crystal structure of the V3O7·H2O material has large interlayer spacing with an open tunnel, making it promising as intercalation-based cathode for aqueous zinc-ion batteries. However, structural degradation and dissolution cause quick capacity fading V3O7·H2O. We addressed this issue via a dual modification by pre-intercalation Ag(I) inside layers (henceforth will be mentioned AgxV3O7·H2O) simultaneous in situ composite formation reduced graphene oxide (rGO). Computationally, we showed that V3O7 facilitates Zn2+ intercalation process thermodynamically stabilizing energy −34.3 eV. The AgxV3O7·H2O ∼1.44-fold improved (270 mA h g–1) much rate capability, over pristine specific cycle stability was further significantly constructed conductive flexible architecture hydrothermally assisted self-assembled packing several intertwined microbelt mats rGO core (AgxV3O7·H2O@rGO). AgxV3O7·H2O@rGO enabled reversible insertion/de-insertion during charge/discharge (as observed ex XRD study) decreased (>27 times) charge transfer resistance to promote high 437 170 g–1 at both low (100 (2000 current, respectively. morphological analysis before after 1000 cycles reveals that, although breakdown is inevitable repetitive cycling, support provides strong interaction mat buffers strain, prevents agglomeration active material, slows down interface. synergistic ∼2.3-fold only 0.028% loss per cycles.