Rotating Ring Disk Electrode for Monitoring the Oxygen Release at High Potentials in Li-Rich Layered Oxides

Wei Yin (1) , Sathiya Mariyappan (1) , Alexis Grimaud (1) , J.-M. Tarascon (1)

1 Collège de France - Chaire Chimie du solide et énergie

Li-rich layered oxides show a staggering capacity that relies on cumulative cationic and anionic redox processes. However, their practical applications are plagued by roadblocks dealing with large hysteresis, capacity fade and irreversible oxygen loss during the first charge that causes undesirable structural changes. Hence, the first step to screen the Li-rich layered oxides is the identification of this gas release phenomenon and its better understanding. Differential electrochemical mass spectrometry (DEMS) is presently used for the elucidation of gas evolution, but its usage is lengthy and far to be routine. Herein we propose the utilization of the simple rotating ring disc electrode (RRDE) technique for the identification of O 2 release phenomenon and hence the quick screening of Li-rich layered

Domaines: Chimie

Wei Yin, Sathiya Mariyappan, Alexis Grimaud, J.-M. Tarascon. Rotating Ring Disk Electrode for Monitoring the Oxygen Release at High Potentials in Li-Rich Layered Oxides. Journal of The Electrochemical Society, 2018, 165 (14), pp.A3326-A3333. ⟨10.1149/2.0481814jes⟩. ⟨hal-02388365⟩