Using Rotating Ring-Disk Electrode to Study the Stability of Organic Solvents in Li-O2 Battery Electrolytes

• Main Authors: CHENG, MENG-HUAN, 鄭孟桓
• Other Authors: CHEN, JENN-SHING
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/14204751332752515397

碩士 === 國立高雄大學 === 應用化學系碩士班 === 105 === Lithium-Oxygen Battery (Li-O2 battery) is attractive due to its huge theoretical energy density (~11000 W/hr), but there are still some obstacles to be overcome. One of the problems is that the electrolyte is not stable and may decompose during discharging/charging process. To realize and to solve this problem, we use rotating ring disk electrode voltammetry (RRDEs) to study the reactions and to quantify the stability of the electrolyte by calculating the oxygen reaction rate constant(kf) and the electrolyte decomposition rate constant(k). Our results confirm that acetonitrile(MeCN) gets the highest kf(7.78×10-2 cms-1), which means the oxygen reduction reaction is the most easily to work in this electrolyte. Pyr14TFSI(1-Butyl-1- methylpyrrolidinium bis(trifluoromethylsulfonyl)imide)has the smallest kf due to its high viscosity and low oxygen diffusion ability. At the other hand, Pyr14TFSI has the lowest decomposition rate constants, means this electrolyte has the best stability against superoxide.