A Sub‐Square‐Millimeter Microbattery with Milliampere‐Hour‐Level Footprint Capacity. Issue 28 (11th June 2022)

• Record Type: Journal Article
• Authors: Qu, Zhe; Zhu, Minshen; Yin, Yin; Huang, Yang; Tang, Hongmei; Ge, Jin; Li, Yang; Karnaushenko, Dmitriy D.; Karnaushenko, Daniil; Schmidt, Oliver G.
• Is Part Of: Advanced energy materials. Volume 12:Issue 28(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-11
• Subjects: aqueous batteries -- high capacity -- microbatteries -- on‐chip systems -- origami -- self‐assembly; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202200714
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: As substantial progress has been made to miniaturize intelligent microsystems to the sub‐square‐millimeter scale, there is a desperate need to move beyond existing microbattery technologies to offer adequate energy at the same footprint. A micro‐origami technology able to wind up a flat layer stack into a Swiss roll presents a promising approach in this regard because it mimics the most successful way to make energy‐dense full‐sized batteries. Here, an on‐chip Swiss‐roll current collector made via the micro‐origami process is developed and it is infused with a MnO2 slurry comprising a zincophilic binder. The zincophilic binder layer enhances zinc ion transportability and suppresses MnO2 dissolution. The MnO2 Swiss‐roll microelectrode is used to create an on‐chip microbattery with a small electrode footprint area of 0.75 mm 2, which shows a footprint capacity up to 3.3 mAh cm –2 . The microbattery demonstrates a reversible capacity of more than 1 mAh cm –2 for 150 cycles. The battery stability can be improved to over 600 cycles at a 50% depth of discharge. An on‐chip integration of a microsystem with the microbattery is demonstrated. The microbatteries set foot in the untrodden sub‐square‐millimeter area providing adequate energy for ever more miniaturized intelligent microsystems. Abstract : A micro‐origami technology able to wind up a flat layer stack into a Swiss roll offers a novel design approach for building a bridge between bulk and microscale batteries. The on‐chip MnO2 Swiss‐roll electrode with a zincophilic interface attains milliampere‐hour‐level energy density, showing great potential for powering sub‐millimeter smart devices.