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Title page for ETD etd-06142018-084514


Type of Document Dissertation
Author Muralidharan, Nitin
Author's Email Address nitin.muralidharan@vanderbilt.edu
URN etd-06142018-084514
Title Mechano-Electrochemistry for Advanced Energy Storage and Harvesting Devices
Degree PhD
Department Interdisciplinary Materials Science
Advisory Committee
Advisor Name Title
Dr. Cary Pint Committee Chair
Dr. Douglas Adams Committee Co-Chair
Dr. Greg Walker Committee Member
Dr. Leon Bellan Committee Member
Dr. Piran Kidambi Committee Member
Dr. Rizia Bardhan Committee Member
Keywords
  • electrochemical mechanical coupling
  • energy harvesting
  • in-situ
  • strain
  • stress
  • mechanical processes
  • elastic strain engineering
  • strain setting
  • substrate strains
  • shapememory alloy
  • superelastic
  • multifunctional energy storage
  • transient energy harvesters
  • transient energy storage
  • pseudocapacitors
  • supercapacitors
  • load-bearing
  • structural
  • human motion harvesting
  • modulating electrochemistry
  • mechano-electrochemistry
  • advanced energy storage
  • advanced energy harvesting
  • low frequency energy harvesting
  • ambient energy harvesting
  • electrochemical-mechanical energy harvesting
  • Nitinol
  • battery mechanics
  • strain engineering
  • energy storage
Date of Defense 2018-06-06
Availability unrestricted
Abstract
A fundamental perception in the energy storage community is that mechanical processes accompanying electrochemical processes are an unavoidable by-product. However, the coupling between mechanics and electrochemistry termed as the ‘mechano-electrochemical coupling’ is a powerful yet unexplored tool. Using principles of elastic strain engineering, we demonstrate controllable modulation of electrochemical parameters governing energy storage systems. Leveraging the shape memory properties of NiTi alloys, redox potentials and diffusion coefficient modulations for energy storage materials were achieved as a function of applied strain. Building off these principles, we developed electrochemical-mechanical energy harvesters for harnessing ambient mechanical energy at very low frequencies (<5 Hz), a regime where the conventional state-of the art piezoelectric and triboelectric energy harvesters have drastically reduced performances. We also highlight frequency tuning capabilities in this class of energy harvesters owing to the inherent differences in various battery electrode chemistries for use in human motion harvesting and sensing applications and multifunctional transient energy harvesting and storage devices. Additionally, to further illustrate the relationship between mechanical and electrochemical properties, we developed multifunctional structural supercapacitor and battery composites for use in load-bearing applications. Overall, these approaches provide paradigm shifting fundamental insights as well as create a framework for developing such multifunctional energy storage/harvesting architectures for a multitude of applications.
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