In situ monitoring of discharge/charge processes in Li-O<sub>2sub> batteries by electrochemical impedance spectroscopy
详细信息 查看全文
- 作者：Imanol L ; a-Medrano ; Idoia Ruiz de Larramendi ; Nagore Ortiz-Vitoriano ; Ricardo Pinedo ; Jos茅 Ignacio Ruiz de Larramendi ; Te贸filo Rojo
- 关键词：Li&ndash ; O2batteries ; Battery performance ; Electrochemical impedance spectroscopy ; Discharge products
- 刊名：Journal of Power Sources
- 出版年：1 March, 2014
- 年：2014
- 卷：249
- 期：Complete
- 页码：110-117
- 全文大小：3179 K
文摘
Gaining insight into the reaction mechanisms underway during charge and discharge in Li-air batteries is essential to allow the target development of improved power and performance devices. This work reports the in situ monitoring of Li-air cells by electrochemical impedance spectroscopy and, for the first time, the development of an electrochemical model allowing the identification and attribution of the processes involved. The voltage at which each reaction product forms has been identified, including Li<sub>2sub>O<sub>2sub> or Li<sub>2sub>CO<sub>3sub> during discharge, together with the delithiation of the outer part of Li<sub>2sub>O<sub>2sub> and oxidation reactions and electrolyte decomposition. The developed model can be used as a valuable tool for the optimisation of composition and structure of the air electrode through the investigation of the resistance associated with each process.