A novel 3D ZIF-8 network-reinforced polyethylene oxide (PEO) composite polymer electrolyte (Z-C-PAN-PEO) is successfully built, in which the network with an interpenetrated structure is tactfully developed by in situ assembling ZIF-8 nanoparticles on electrospinning carboxylated polyacrylonitrile (C-PAN) nanofiber surfaces. ZIF-8 with high porosity and unsaturated open metal sites will act as the bridge between C-PAN nanofibers and the PEO matrix. It is proven that the selected ZIF-8 can play a significant role in facilitating Li + conduction and transference by effectively interacting with the oxygen atoms of C−O−C to promote the segmental movement of PEO and immobilizing TFSI − anions to release more free Li + . The 3D interpenetrating structure of Z-C-PAN further enables the conduction channels more consecutive and long-ranged, endowing the Z-C-PAN-PEO electrolyte with an optimum ionic conductivity of 4.39 × 10 −4 S cm −1 and a boosted Li + transference number of 0.42 at 60 °C. Other improvements occurring in the reinforced electrolytes are the broaden electrochemical stability window of ∼4.9 V and sufficient mechanical strength. Consequently, the stable Li-plating/stripping for 1000 cycles at 0.1 mA cm −1 witnesses the splendid compatibility against Li dendrite. The cycling performance of LiFePO 4 /Z-C-PAN-PEO/Li cells with a reversible capacity of 116.2 mAh g −1 after 600 cycles at 0.2 C guarantees the long-term running potential in lithium metal batteries. This study puts forward new insights in designing and exploiting the active role of MOFs for highperformance solid polymer electrolytes.

Acidic zinc−carbon dry batteries have been widely used in life because of their low cost. However, a great quantity of used batteries is discarded as refuse, which not only wastes resources but also leads to environmental contamination. To reuse spent batteries on a large scale, this study concerns a simple, effective, and sustainable strategy to turn them into MnO/ZnO/C composites. After a conventional leaching treatment followed by pyrolysis, the rust cathode materials can be reduced to MnO/ZnO/C. When serving as a rechargeable zinc‐ion battery cathode, this electrode provides a maximum reversible capacity of around 362 mAh g−1MnO) and a rate capability of 191 mAh g−1MnO at a high current rate of 1.20 A g−1. Furthermore, ZnO gradually dissolves in the electrolyte with the increase of discharge cycles, replenishing the Zn2+ content in the electrolyte and further enhancing cycling stability (98.02 % after 500 cycles). The device also exhibits a remarkable energy density of 336.37 Wh kg−1, low self‐discharge rate, and can efficiently power a LED panel. This strategy offers an economical and facile route to convert zinc−carbon battery waste into useful materials for aqueous rechargeable zinc ion batteries.

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Manganese-base cathodes have attracted enormous attention in rechargeable aqueous zinc ion batteries (AZIBs) owing to their high energy density and abundant reserves. However, the low electrical conductivity and the inevitable...