Research progress of zinc-ion batteries. (A) The schematic illustration of the fiber battery based on Zn wire and MnO₂/carbon fiber. (B) The discharge curves of fiber battery with Zn wire or Zn powder/carbon fiber as negative electrode. (C) Two fiber batteries connected in series continuously drive a commercial green LED when bent around human finger. (A–C) Reproduced with permission from [80]. Copyright©2013, Elsevier. (D) Schematic of fabrication and encapsulation of yarn ZIBs to power luminescent panel. Reproduced with permission from [81]. Copyright©2018, American Chemical Society. (E) Schematic illustration of quenched Ni-V₂O₅ NWs@CNT fiber electrode. (F) Galvanostatic charge-discharge (GCD) curves. (E, F) Reproduced with permission from [82]. Copyright©2012, Elsevier. (G) Diagram of synthesis procedure of a-Ca-V₂O₅/CNTF. (H) Comparison of rate performance. (G, H) Reproduced with permission from [83]. Copyright©2023, Wiley-VCH. (I) Schematic of flexible high-voltage coaxial of FAZBs. Reproduced with permission from [1]. Copyright©2019, American Chemical Society. (J) Schematic illustration of as-fabricated FAZIB based on dual-layer gel electrolyte with lysine. (K) Cyclic property and coulombic efficiency of as-assembled FAZIB. Inset: GCD splines at selected cycle. (J, K) Reproduced with permission from [27]. Copyright©2024, Wiley-VCH.