119th General Meeting of the KCS

Type Symposium
Area Recent Trends in Electrochemistry I
Room No. 406호
Time THU 14:45-:
Code ELEC1-4
Subject Real-time & Quantitative Analysis of Li-air Battery Materials by In-situ Differential Electrochemical Mass Spectrometry
Authors 김동욱
한국화학연구원 차세대전지소재연구센터, Korea
Abstract Lithium-air battery is a promising battery technology for next generation battery for a long-driving-range electric vehicle. However recent tremendous research studies have found that there are many issues such as fast capacity fading on cycling, high overpotential in charge, low oxygen efficiency, etc. Since the problems are largely due to instability in the electrolytes and electrodes, many researches are driven to develop stable materials for electrolytes and electrode for true rechargeable lithium-air battery. During the cycles, the reactive superoxide ion and lithium peroxide may attack the susceptible organic electrolyte and carbon cathode, yielding several by-products such as lithium carbonate, lithium carboxylate, and lithium alkyl carboxylates. The side-products caused evolution of carbon dioxide instead of oxygen in charge, loss of capacity, and finally failure of the cell operation. Many research groups are attempting to develop a stable electrolyte and cathode to suppress the side reaction in the cell. To identify stable materials, they measure mainly coulomb efficiency, energy efficiency, and cyclability. There is another important parameter to be evaluated in the lithium air cell: oxygen efficiency, which is a ratio of oxygen consumed in discharge to oxygen re-generated in charge stage. In-situ differential electrochemical mass spectrometer (DEMS) is a useful instrument to measure the oxygen efficiency. It is composed of an electrochemical cell connected with a potentiostat and a mass spectrometer, to measure a gas product generated during an electrochemical reaction in the cell in in-situ and real-time mode. In this talk, I will present and discuss how to utilize in-situ DEMS for identifying and developing stable lithium-air battery materials.
E-mail dongwook@krict.re.kr