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Dendrites Inhibition in Rechargeable Lithium Metal Batteries

Citation

Aryanfar, Asghar (2015) Dendrites Inhibition in Rechargeable Lithium Metal Batteries. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Z9ZK5DMP. http://resolver.caltech.edu/CaltechTHESIS:05012015-161434189

Abstract

The specific high energy and power capacities of rechargeable lithium metal (Li0) batteries are ideally suited to portable devices and are valuable as storage units for intermittent renewable energy sources. Lithium, the lightest and most electropositive metal, would be the optimal anode material for rechargeable batteries if it were not for the fact that such devices fail unexpectedly by short-circuiting via the dendrites that grow across electrodes upon recharging. This phenomenon poses a major safety issue because it triggers a series of adverse events that start with overheating, potentially followed by the thermal decomposition and ultimately the ignition of the organic solvents used in such devices.

In this thesis, we developed experimental platform for monitoring and quantifying the dendrite populations grown in a Li battery prototype upon charging under various conditions. We explored the effects of pulse charging in the kHz range and temperature on dendrite growth, and also on loss capacity into detached “dead” lithium particles.

Simultaneously, we developed a computational framework for understanding the dynamics of dendrite propagation. The coarse-grained Monte Carlo model assisted us in the interpretation of pulsing experiments, whereas MD calculations provided insights into the mechanism of dendrites thermal relaxation. We also developed a computational framework for measuring the dead lithium crystals from the experimental images.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Rechargeable Batteries, Dendrites, Material Physics, Electrochemistry
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Mechanical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Hoffmann, Michael R.
Thesis Committee:
  • Andrade, Jose E. (chair)
  • Goddard, William A., III
  • Greer, Julia R.
  • Minnich, Austin J.
  • Hoffmann, Michael R.
Defense Date:22 April 2015
Non-Caltech Author Email:asghar.aryanfar (AT) gmail.com
Funders:
Funding AgencyGrant Number
Bill and Melinda Gates Foundation OPP1069500
Bill and Melinda Gates FoundationOPP1105724-1
Record Number:CaltechTHESIS:05012015-161434189
Persistent URL:http://resolver.caltech.edu/CaltechTHESIS:05012015-161434189
DOI:10.7907/Z9ZK5DMP
Related URLs:
URLURL TypeDescription
http://pubs.acs.org/doi/abs/10.1021/jz500207aPublisherArticle adapted for ch.2
http://pubs.rsc.org/en/content/articlepdf/2014/cp/c4cp03590aPublisherArticle adapted for ch.3
http://pubs.rsc.org/en/content/articlelanding/2015/cp/c4cp05786dPublisherArticle adapted for ch.4
http://pubs.acs.org/doi/abs/10.1021/es404137uPublisherArticle adapted for Appendix B
ORCID:
AuthorORCID
Aryanfar, Asghar0000-0002-8890-077X
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8727
Collection:CaltechTHESIS
Deposited By: Asghar Aryanfar
Deposited On:22 Sep 2015 19:52
Last Modified:13 Oct 2016 21:30

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