A Versatile, High-Precision, High-Throughput Integrated Impedance Spectroscopy and Battery Cycling Instrument for Army Power Sources Research
Abstract
The High-Precision, High-Throughput Integrated Impedance Spectroscopy Cycler is a versatile tool for conducting advanced power sources research to meet the needs of the United States Army. The Army Research Office (ARO)Õs Electrochemistry Branch led by Dr. Robert Mantz has a mission of performing fundamental research for developing advanced power sources to meet the needs of the United States Army. The ARO program specifically emphasizes research into understanding the materials and processes that limit the performance of current power sources, and also learning how to design future power source devices. Specific research areas of interest include: fundamental processes in ion-conduction, interfacial electron transfer, transport through coatings, and the development of quantitative models. The proposed instrumentation will allow us to conduct operando high-precision Electrochemical Impedance Spectroscopy (EIS) experiments on power sources to determine the properties of the electrode-electrolyte interface, diffusion through the electrode bulk structure and interfaces, and the process of ionic conduction in the electrolytes. The technique of EIS is particularly well-suited for investigating multiple physicochemical processes simultaneously in a single experiment. In this experiment, a small, alternating sinusoidal excitation potential of known frequency is applied to the device and the alternating current response is measured. The magnitude of impedance and phase shift between the potential and current response are then measured. ÒImpedance spectroscopyÓ derives its name from the response typically being measured over a wide range of excitation frequencies. This method has been widely applied to the study of various fundamental processes in electrochemical systems, and is directly applicable to the study of power sources. The high-precision feature of this instrument will allow us to monitor the slow changes and characterize the non-steady state behavior that can occur as a result from the conditions of operation, storage, and abuse of the power sources. The high-throughput feature of the instrument will allow us to collect large sets of data in order to determine statistical significance. Finally, the EIS capability of this instrument is integrated with battery cycling capabilities, allowing us to continuously monitor the evolution of interfacial properties as functions of power and capacity fade of the battery.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 22, 2019
- Source ID
- W911NF1910213
Entities
People
- Sri Narayan
Organizations
- Army Contracting Command
- United States Army
- University of Southern California