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• The capacities achieved 0.08 mAh/cm2 for thin-film electrolytic MnO 2 -Zn batteries. • Over 200 cycles were demonstrated for batteries with electrolyte of 25 µL/cm2. • The shuttle reactions caused by iodide mediators were revealed experimentally. Whilst electrolytic MnO 2 with a high capacity draws great attention recently, the shuttle reactions between the mediator additives in the electrolytes with zinc and MnO 2 are often overlooked. In this work, neutral acetate electrolytes with iodide mediator are tested for electrolytic MnO 2 -Zn system on thin-film batteries. With a limited amount of electrolyte, the shuttle reactions caused by iodide mediator becomes more obvious, which results in low Coulombic efficiencies and shortens shelf-life. [ABSTRACT FROM AUTHOR]

The possibility of enhancing the frequency performance of electrochemical capacitors by tailoring the nanostructure of the carbon electrode to increase electrolyte permeability is demonstrated. Highly porous, vertically oriented carbon electrodes which are in direct electrical contact with themetallic current collector are produced viaMPECVD growth onmetal foils.Theresulting structure has a capacitance and frequency performance between that of an electrolytic capacitor and an electrochemical capacitor. Fully packaged devices are produced on Ni and Cu current collectors and performance compared to state-of-the-art electrochemical capacitors and electrolytic capacitors.The extension of capacitive behavior to the AC regime (~100Hz) opens up an avenue for a number of new applications where physical volume of the capacitor may be significantly reduced. [ABSTRACT FROM AUTHOR]

We propose an electrode-free zinc manganese battery, where both zinc and MnO2 are electro-deposited from the electrolyte via a charging process onto carbon current collectors. The electrode-free batteries show an improved cycling performance of thin-film batteries than the ones with a zinc anode and a facilitated fabrication process for fiber batteries. [ABSTRACT FROM AUTHOR]