Description
Date/Time: 04-05-2018 - Thursday - 05:00 PM - 07:00 PM
Taichong Ma1

1, University of Washington, Seattle, Washington, United States

High energy density, thin and flexible batteries are a critical component of flexible electronics. Metal air chemistries are particularly attractive for flexible electronics applications as they eliminate the need for thickness-adding packaging and capacity-limiting cathode volumes. Here we demonstrate the first fully printed ultrathin metal air batteries from solution processed cell layer materials that enable monolithic layer by layer stencil printing. Printed cell layers include the current collector, a zinc alloy composite electrode, a solid ionic liquid/polymer electrolyte and an oxide nanocatalyst-decorated reduced graphene oxide(r-GO) /carbon nanotube(CNT) composite cathode. The carbon nanotube/graphene catalyst mixture layer self aseembles into hierarchical porous structure with MnCo2O4 nanoparticles(~10nm) decorated r-GO flakes(2-4 layers) covering the surface of CNT bundles(~50μm). We utilized the hierarchical nanostructures to maximize the number of reaction active sites while maintaining sufficient electrical percolation and air access to the catalytic sites in the cathode. The The low vapor pressure of ionic liquid enables thermal processing temperatures of 80°C. The printed metal air batteries exhibit high thin cell volumetric capacities of 170 mAh/cm3, areal capacities of 2.0 mAhr/cm2 from a total cell thickness of 150 micron. This is among the very highest areal capacity batteries demonstrated to date and relies on air stable, low cost and low toxicity printed Zn air / solid polymer electrolyte chemistry. The batteries are bendable and lightweight and are well positioned as a promising power source of flexible electronics and next generation wearable and on-body electronics.

Meeting Program
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5:00 PM–7:00 PM Apr 5, 2018

PCC North, 300 Level, Exhibit Hall C-E