Piezo-Electrochemical Energy Harvesting with Lithium-Intercalating Carbon Fibers

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• 作者：Eric Jacques ; G枚ran Lindbergh ; Dan Zenkert ; Simon Leijonmarck ; Maria Hellqvist Kjell
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 1, 2015
• 年：2015
• 卷：7
• 期：25
• 页码：13898-13904
• 全文大小：380K
• ISSN：1944-8252

文摘

The mechanical and electrochemical properties are coupled through a piezo-electrochemical effect in Li-intercalated carbon fibers. It is demonstrated that this piezo-electrochemical effect makes it possible to harvest electrical energy from mechanical work. Continuous polyacrylonitrile-based carbon fibers that can work both as electrodes for Li-ion batteries and structural reinforcement for composites materials are used in this study. Applying a tensile force to carbon fiber bundles used as Li-intercalating electrodes results in a response of the electrode potential of a few millivolts which allows, at low current densities, lithiation at higher electrode potential than delithiation. More electrical energy is thereby released from the cell at discharge than provided at charge, harvesting energy from the mechanical work of the applied force. The measured harvested specific electrical power is in the order of 1 渭W/g for current densities in the order of 1 mA/g, but this has a potential of being increased significantly.