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A MEMS-enabled 3D zinc-air microbattery with improved discharge characteristics based on a multilayer metallic substructure
- A MEMS-enabled 3D zinc-air microbattery with improved discharge characteristics based on a multilayer metallic substructure
- Armutlulu A.; Fang Y.; Kim S.H.; Ji C.H.; Bidstrup Allen S.A.; Allen M.G.
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- Journal of Micromechanics and Microengineering
- vol. 21, no. 10
- SCI; SCIE; SCOPUS
- This paper reports the design, fabrication and testing of a three-dimensional zinc-air microbattery with improved areal energy density and areal capacity, particularly at high discharge rates. The device is based on a multilayer, micron-scale, low-resistance metallic skeleton with an improved surface area. This skeleton consists of alternating Cu and Ni layers supporting Zn as electrodeposited anode electrode, and provides a high surface area, low-resistance path for electron transfer. A proof-of-concept zinc-air microbattery based on this technology was developed, characterized and compared with its two-dimensional thin-film counterparts fabricated on the same footprint area with equal amount of the Zn anode electrode. Using this approach, we were able to improve a single-layer initial structure with a surface area of 1.3 mm 2 to a scaffold structure with ten layers having a surface area of 15 mm 2. Discharging through load resistances ranging from 100 to 3000 Ω, the areal energy density and areal capacity of the microbattery were measured as 2.5-3 mWh cm -2 and ∼2.5 mAh cm -2, respectively. © 2011 IOP Publishing Ltd.
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