Designing Flexible Current Collectors for Lithium-ion Batteries

Open Access
Author:
Farese, Joseph Jeffrey
Area of Honors:
Mechanical Engineering
Degree:
Bachelor of Science
Document Type:
Thesis
Thesis Supervisors:
  • Christopher D. Rahn, Thesis Supervisor
  • Hosam Kadry Fathy, Honors Advisor
Keywords:
  • Lithium-ion
  • Current Collectors
  • Flexible Batteries
Abstract:
Lithium-ion batteries are used in many applications as energy storing devices. In some of these applications, it is advantageous for the battery to be axially flexible so it can deform in response to applied loads and/or to accommodate volume change in the active material. Silicon anodes, for example, have high energy density and can change volume by up to 300% during charging, providing the potential for self-powered actuators and sensors. This thesis designs flexible electrodes that can change shape and size with volume-changing active materials. Design and analysis were performed on several current collector topologies that utilized compliant array technology to be more flexible. Analysis looked to optimize flexibility while also maintaining battery integrity and performance. Specific parameters compared between designs included the maximum stresses, internal electrical resistance, and axial flexibility of the current collectors. Comparison of designs via these parameters resulted in an array of designs that could be optimized for the needs of a specific application.