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High-Voltage Liquid-Electrolyte Microbatteries Inspired from Electric Eels

전기뱀장어의 전기발생을 모사한 고전압 액체 전해질 미소전지

  • 김문철 (한국과학기술원 바이오및뇌공학과, 디지털나노구동연구단) ;
  • 조영호 (한국과학기술원 바이오및뇌공학과 및 기계공학과, 디지털나노구동연구단)
  • Published : 2009.05.01

Abstract

We present high-voltage liquid-electrolyte microbatteries, inspired from the high-voltage generation mechanism of electric eels using serially connected multiple-cell arrays. In the microbatteries, we purge air into the electrolyte filled in a channel layer to isolate serially connected multiple cell arrays using three surface-tension valves (cell-front, outlet, and cell-end valves). Compared to the previous multi-cell stack or interconnection, present microbatteries provide a reduced multi-cell charging time. We have designed and characterized four different prototypes C1, C10, C20, and C40 having 1, 10, 20, and 40 cells, respectively. In the experimental study, the threshold pressures of cell-front, outlet, and cell-end valves were measured as $460{\pm}47$, $1,000{\pm}53$, and $2,800{\pm}170$ Pa, respectively. The average charging time for C40 was measured as $26.8{\pm}4.9$ seconds where the electrolyte and air flow-rates are 100 and $10{\mu}l/min$, respectively. Microbatteries showed the maximum voltage of 12 V (C40), the maximum power density of $110{\mu}W/cm^2$ (C40), and the maximum power capacity of $2.1{\mu}Ah/cm^2$ (C40). We also proposed a tapered-channel to remove the reaction gas from the cell chamber using a surface tension effect. The present microbatteries are applicable to high-voltage portable power devices.

Keywords

Microbattery;High-Voltage Generation;Liquid-Electrolyte Battery;Serially Connected Cell Array;Surface Tension Valve

References

  1. Koeneman, P., Busch-Vishniac, I., and Wood, K., 1997, 'Feasibility of Micro Power Supplies for MEMS,' Journal of Microelectromechanical systems, Vol. 6, No. 4, pp. 355-362 https://doi.org/10.1109/84.650133
  2. Lee, K. B., and Lin, L., 2003, 'Electrolyte-Based on-Demand and Disposable Microbattery,' Journal of Microelectromechanical systems, Vol. 12, No. 6, pp. 840-847 https://doi.org/10.1109/JMEMS.2003.820272
  3. Ryan, D. M., LaFollette, R. M. and Salmon, L. 1997, 'Microscopic Batteries for Micro Electro-Mechanical Systems (MEMS),' Proceedings of the 32nd Intersociety Energy Conversion Engineering Conference, Vol. 1, pp. 77-82 https://doi.org/10.1109/IECEC.1997.659163
  4. Seo, Y. H., and Cho, Y. -H., 2004, 'Design, Fabrication and Chracterization of Miniature Direct Methanol Fuel Cell Using Platinum-Sputtered Microcolumn Electrodes with Limited Fuel Source,' Sensors and Materials, Vol. 16, No. 6, pp. 277-289
  5. Feng, Y., Zhou, Z., Ye, X. and Xiong, J., 2003, 'Passive Valves Based on Hydrophobic Microfluidics,' Sensors and Actuators A, Vol. 108, pp. 138-143 https://doi.org/10.1016/S0924-4247(03)00363-7