[CCoE Notice] Thesis Defense: Flexible and Stretchable Lithium Ion Batteries Using Fabric-Based Electrodes and Solid Polymer Electrolyte

[Grayson, Audrey A]

Flexible and Stretchable Lithium Ion Batteries Using Fabric-Based Electrodes and Solid Polymer Electrolyte

Bahar Moradi Ghadi

PhD Defense, Mechanical Engineering
Committee members: Dr. Haleh Ardebili, Dr. Jae-Hyun Ryou, Dr. Debora Rodrigues, Dr. Yashashree Kulkarni, Dr. Li Sun
Friday April 27th, 3-5 pm
Location: College of Technology T2—Building 508, Conference Room 323

Abstract
The development of stretchable and wearable energy storage devices including lithium ion batteries are strongly motivated by tantalizing applications such as smart garments, wearable communication, flexible display devices, and medical implants. Such lithium ion batteries require a stable performance while experiencing mechanical deformations such as bending, compressing, twisting, and stretching. Therefore, in addition to flexibility, they need to be stretchable. Although there has been a noticeable progress in developing flexible and stretchable energy storage devices such as supercapacitors and solar cells, a similar technical maturity has not yet been achieved in stretchable lithium ion batteries. Current designs generally suffer from many problems including low energy and/or power density, limited deformability, poor stability in stretched configurations, short cycle life, and presence of large amounts of toxic and flammable liquid electrolytes. In addition, most reported designs rely on stretchable architectural designs using one or more rigid components and therefore, fail to demonstrate stretchability of the entire device.
The purpose of this dissertation is the development and characterization of a flexible and stretchable lithium ion battery that meets the requirement of stretchability of each and all the components of the battery including electrodes, electrolyte, and encapsulation. The lithium ion battery in this study is developed in the view of eventual integration in flexible and stretchable smart textile applications. The study initially investigates the feasibility of using stretchable fabrics as platform and current collector in stretchable electrodes for lithium ion batteries. Inherently electrically conductive silver fabric is demonstrated as a viable choice for fabric-based stretchable electrodes. Stretchable silver-fabric LiCoO2 cathode and graphite anode are fabricated and their mechanical and electrochemical properties are characterized. The compatibility of the developed electrodes with a stretchable solid polymer electrolyte (i.e. polyethylene oxide) is investigated and the amount of the required liquid electrolyte to achieve a desirable discharge capacity is optimized. Furthermore, fabrication and characterization of a fully flexible and stretchable fabric-based lithium ion battery is reported. The stretchable lithium ion battery composed of silver fabric LiCoO2 cathode and graphite anode, polyethylene oxide solid polymer electrolyte, and an elastic encapsulation. Both the electrochemical and mechanical performances of the fabric-based stretchable lithium ion battery are presented and discussed.

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