Theoretical and Experimental Study of Current from Non-Disintegrable Suspended Particles at a Rotating Disk Electrode. Issue 1 (14th January 2022)

• Record Type: Journal Article
• Authors: Tang, Christopher R.; Housel, Lisa M.; Huang, Cynthia; Li, Wenzao; Wang, Lei; Yan, Shan; Takeuchi, Esther S.; Marschilok, Amy C.; Colosqui, Carlos E.; Takeuchi, Kenneth J.
• Is Part Of: Journal of the Electrochemical Society. Volume 169:Issue 1(2022)
• Publication Date: 2022-01-14
• Subjects: rotating disk electrode -- lithium titanium oxide -- Cotrell equation -- semi-solid battery -- suspended solid electrochemistry; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac3ade
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Understanding the current response at an electrode from suspended solid particles in an electrolyte is crucial for developing materials to be used in semi-solid electrodes for energy storage applications. Here, an analytical model is proposed to predict and understand the current response from non-disintegrable solid particles at a rotating disk electrode. The current is shown to be limited by a combination of ion diffusion within the solid particle and the mean residence time of the particle at the rotating disk electrode. This results in a relationship between current and angular frequency of I ∝ ω 3 / 4, instead of the classical I ∝ ω 1 / 2 predicted by Levich theory. Specifically, the current response of Li4 Ti5 O12 (LTO) microparticles suspended in a non-aqueous electrolyte of lithium hexafluorophosphate (LiPF6 ) in ethylene carbonate: diethyl carbonate (EC:DEC) was determined experimentally and compared favorably with predictions from the proposed analytical model using fitting parameters consistent with the experimental conditions.