Date of Award

12-2018

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

School of Materials Science and Engineering

Committee Member

Mark E. Roberts, Committee Chair

Committee Member

Jianhua Tong

Committee Member

Kyle S. Brinkman

Committee Member

Igor Luzinov

Abstract

Electrochemical energy storage devices such as supercapacitors (SCs) and lithium ion batteries (LIBs) play pivotal role in the undergoing “green energy revolution”, which involves the profound transformation of energy production pattern from fossil fuel to renewable energy such as solar and wind due to environmental pollution, global warming, and the inevitable depletion of crude oil and coal. However, wide applications of SCs and LIBs are still limited due to issues like thermal runway and derived hazards such as ageing or capacity degradation, fires and explosions. Even more so, thermal control issues only aggravate in large format devices. With the purpose to prevent thermal runaway from happening, temperature responsive polymers (TRPs) included electrochemical energy storage devices such as SCs and LIBs were designed and tested. By utilizing phase transition phenomenon such as hydrophilicity shift, precipitation of TRPs, it was discovered that TRP included system’s electrochemical performance could be efficiently halted once temperature raised beyond phase transition temperature, or lower critical solution temperature (LCST), therefore limiting further heating of the device. It is therefore believed that the development of this technology would offer inherent safe, localized protection mechanism (without disrupting the overall performance) for future large format energy storage devices.

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