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Title page for ETD etd-05162018-110624

Type of Document Dissertation
Author Cohn, Adam Paul
Author's Email Address adampcohn@gmail.com
URN etd-05162018-110624
Title Cointercalation and In-Situ Plating for Advanced Sodium Batteries
Degree PhD
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Cary Pint Committee Chair
David Cliffel Committee Member
Greg Walker Committee Member
Jason Valentine Committee Member
Richard Haglund Committee Member
  • battery
  • Na-ion
  • grid storage
  • cointercalation
  • anode-free
  • sodium
  • sodium-ion
Date of Defense 2018-04-11
Availability unrestricted
In the push to decarbonize our electricity and transportation sectors, the continued reduction in the cost of electrical energy storage is critical. While Li-ion batteries have emerged as the best-suited technology for grid storage and electric vehicles, the cost sensitivity of these applications and concerns over the limited reserves of Li motivate the development of alternative strategies for low-cost electrical energy storage. In this dissertation, I explore opportunities for developing advanced batteries based on Na chemistries. Rather than working on Na-ion cells analogous to commercial Li-ion cells, I focus on the unique advantages of Na. Specifically, I study (1) the fast cointercalation of Na ions and diglyme solvent into graphitic carbon, and (2) the stable electroplating of Na metal on carbon and Na alloy substrates. Building on my findings, I develop the first sodium metal battery using an "anode-free" assembly, where all the sodium is initially stored in an air-stable cathode material. Through this approach, I demonstrate cell performance attributes (such as specific energy, energy efficiency, and voltage stability) that are attractive for low-cost, high-performance electrical energy storage applications.
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