We previously demonstrated that a redesign of the form factor for zinc (Zn) anodes to a monolithic, porous 3D-wired sponge sets a new benchmark for rechargeable alkaline Zn batteries. By engineering the solid volume fraction from the benchmarked 20% (Zn 20 ) to 30% (Zn 30 ), we increase the degree of metallic connectivity, boost mechanical integrity, and out-power the first-generation counterpart. Visualizing the internal structure using X-ray computed microtomography (XCMT) confirms increased interconnectivity within the denser Zn 30 . To highlight the energy and power improvements, we pair the zinc sponges with a silver oxide cathode in prototype Ag−Zn cells and demonstrate superior performance with Zn 30 anodes: 50% improvement in zincnormalized volumetric capacity (up to 1.6 Ah L Zn −1) and supercapacitor-like specific power (up to ∼6 kW kg Zn −1 ), all while maintaining rechargeability.
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