Pt/Ga Microelectrode Localized Lithium Detection in Li-Ion Battery Electrolytes

Local Li + ion detection in the Lithium Ion Batteries (LIBs) is important as lithium ions are exchanging between cathode and anode material via the electrolyte during battery operation. Therefore, the goal here is to develop a technique to detect lithium ions transport within the electrolyte filled porous network of the cathode. Scanning electrochemical microscopy (SECM) was chosen for Li + detection in this study as a powerful tool for recoding the in situ electrochemical behavior of this chemical species. 1,2 A Pt/Ga microelectrode was used as a probe for SECM. After preparing a cone shape Pt/Ga microelectrode and using anodic stripping voltammetry (ASV) or square wave voltammetry (SWV), a linear current response from 0.3-5 mM Li + concentrations was obtained. The limit of detection was determined to 77 µM. These result firmly established Pt/Ga microelectrode as a reliable probe for determining the diffusion of Li + ion from different locations of the LIB solid materials. References: (1) Polcari, D.; Dauphin-Ducharme, P.; Mauzeroll, J. Chemical reviews 2016 , 116 , 13234-13278. (2) Barton, Z. J.; Rodríguez-López, J. n. Analytical chemistry 2014 , 86 , 10660-10667. Figure 1