Project Description
The large-energy-density battery need for emerging electrical vehicles (EVs) and portable electronic devices such as mobiles and drones necessitates scientists to explore new electrode materials in rechargeable battery that can deliver long-lifetime and high energy density. Li metal, having a theoretical capacity of 3860 mAh/g, is attracting more attentions in next-generation lithium-ion batteries (LIBs). However, the irreversible Li plating/striping can reduce the cycling capability and possibly introduce dendrite growth, thus leading to a series of performance decay and safety issues. In this project, we will design a passivated thin Li metal anode via surface modification, which shows a highly reversible plating/stripping performance upon ultra-long cycles. Full cell batteries of both coin and pouch cells with high-nickel manganese-cobalt oxide as cathode exhibit an improved capacity retention. The mossy/dendritic Li is largely suppressed, which ensures great safety of the battery during cycling. This applied research has significant impacts on human daily life by guiding the design of high energy-density and high safety batteries.
Tasks and Responsibilites
The student will focus on the surface modifications of lithium metal and coin cell battery testing. Specifically this will cover: (1) material preparation and electrochemical property measurements, (2) coin cell assembly and (3) cell cycling performance testing. The student will participate the operation/analysis of various scientific apparatuses including centrifuges, tube furnace, X-ray Diffraction, Scanning Electron Microscopy, and Energy Dispersive X-ray Spectroscopy. He will assist with research projects including materials synthesis, related characterization and performance tests; helps order laboratory supplies; performs literature search; interprets experimental test data; performs minor equipment repairs. He will also attend group meeting and participate in group discussion.