UROP Proceedings 2021-22

School of Engineering Department of Chemical and Biological Engineering 80 Neural Circuits for Visual Behaviors Supervisor: SEMMELHACK Julia Lee / CBE Student: FARHAN Ishraq / IRE Course: UROP1000, Summer Freezing behaviour, expressed by bradycardia, can be provoked by visual stimulus. The project seeks to establish that this behaviour can be exhibited and to optimise the features of a visual stimulus required to evoke this response. The stimulus evoking freezing is a moving dot. One feature of the stimuli to study is the changing luminance as it moves. With a dynamic luminance stimulus, which is a rectangle spanning the screen whose contrast is changing over time, we control for the changing luminance received by the eyes to determine whether the freezing behaviour can be ascribed to the changing luminance of a dot as it moves across the larvae’s field of view. Anode Materials for Lithium Ion Batteries Supervisor: SHAO Minhua / CBE Student: CHOI Jae Uk / CENG Course: UROP1100, Fall UROP2100, Summer Higher energy density and higher voltage batteries have been the long sought out characteristics for further development of electric vehicles (EV) and electrical storage systems (ESS). However, current Ni-rich LiNi0.8Co0.1Mn0.1 (NCM811) cathodes exhibit oxidative instability under high potential (>4.2V) conditions, resulting in particle surface deterioration and poor cycling stability. In this report, Li-rich Li1.2Mn0.54Ni0.13Co0.13 (LR-MNC) cathode and bis(2, 2, 2-Trifluoroethyl) Carbonate (DTFEC) electrolyte were explored. LR-MNC exhibits promising stability and capacity at higher potential (<4.8V) with the higher Mn content. Highly fluorinated carbonate DTFEC offers to be a good replacement for ether-based electrolyte such as 1,2dimethoxyethane (DME) and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether (HFE), which is unstable when paired with high Ni-content cathodes at higher potential.