Abstract
Although lithium ion battery research often focuses on electrochemical properties, lithium ion intercalation materials are also mechanically active. Essentially, these materials exhibit a mechanical-electrochemical coupling such that when a stress is applied, the voltage of the battery increases. In this work, we develop a model to study and predict the effectiveness of intercalation materials as mechanical energy harvesters. Specifically, we show that a lithium ion battery harvester can be modelled as a simple circuit and that we can make both qualitative and quantitative predictions about the effectiveness of a battery material given its intrinsic mechanical and electrochemical properties. The measured efficiency of our system, calculated from the energy output and total work input, is 0.012 ± 0.004%, and our model predicts that the maximum theoretical efficiency of the system is 2.9 ± 0.5%. In the future, this model will help us develop and study other intercalation materials that will bring the measured efficiency closer to our proposed theoretical maximum.
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Acknowledgements
The authors thank Sydney Hall for assistance with data collection. Funding provided through Princeton University and the Princeton University School of Engineering and Applied Science.
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Schiffer, Z.J., Arnold, C.B. Characterization and Model of Piezoelectrochemical Energy Harvesting Using Lithium ion Batteries. Exp Mech 58, 605–611 (2018). https://doi.org/10.1007/s11340-017-0291-1
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DOI: https://doi.org/10.1007/s11340-017-0291-1