UROP Proceedings 2021-22

School of Engineering Department of Chemical and Biological Engineering 81 Anode Materials for Lithium Ion Batteries Supervisor: SHAO Minhua / CBE Student: JUNG Euntaek / CENG Course: UROP1100, Fall Lithiummetal is considered as a novel anode material due to its high specific capacity and low voltage plateau. To enable practical application of Li metal anode, problems regarding volume expansion and side reaction between active lithium and electrolyte need to be solved. Adjusting lithium salts and solvents of electrolyte is one way to address the limitations of Li metal anode. In this project, a ether based electrolyte containing lithium difluoro(oxalate)borate (LiDFOB) salt, 1,2-dimethoxyethane (DME) and 1,1,2,2-tetrafluoroethyl2,2,3,3-tetrafluoropropylether(HFE) solvents was prepared. Cells were assembled with LiCoO2 cathode, Li meatal anode and such electrolyte. During the electrochemical measurement, specific capacity and coulombic efficiency of the cells were measured for 100 cycles. Such electrolyte was stable on both LiCoO2 and Lithium metal sides, leading to high coulombic efficiency (99.5%) and capacity retention ratio(97% after 100 cycles). Anode Materials for Lithium Ion Batteries Supervisor: SHAO Minhua / CBE Student: KIM Sungrae / CHEM Course: UROP1000, Summer Currently, aluminum foil is widely employed as a cathode current collector due to its high electronic conductivity, low cost, and chemical stability. Despite its notable characteristics, the aluminum current collector still has a few obstacles to overcome to meet the demands of next-generation lithium batteries: higher chemical stability in high voltages and enhanced electronic conductivity. The study employs a carboncoated aluminum foil as a current collector in the lithium metal battery with Li1.2 Mn0.54Ni0.13Co0.13O2 (Li-rich) cathode. Half-cell tests with lithium metal batteries are performed to observe the enhanced capacity delivery and cycling stability due to the employment of carbon-coated aluminum as a new current collector material.