Work

Unveiling factors affecting the solid electrolyte interphase resistance: the effect of real surface area and particle size of electrode materials

Year: 2025

Type: article

Abstract: This work identifies previously neglected factors and their impact on solid electrolyte interphase (SEI) formation on graphite and cathode electrolyte interphase (CEI) formation on lithium manganese oxide (LiMn 2 O 4 ). These factors are active materials’ surface area and particle size. They were investigated by galvanostatic charging/discharging and electrochemical impedance spectroscopy (EIS) on the following examples: graphite (25.2 m 2 g −1 , 12.3 m 2 g −1 , 6.0 m 2 g −1 ), LiMn 2 O 4 (particle size < 0.5 µm) 11.7 m 2 g −1 , and LiMn 2 O 4 (particle size < 5 µm) 3.3 m 2 g −1 , respectively. The test cells were worked in 1 M LiPF 6 solution in a mixture of ethylene carbonate (EC) with dimethyl carbonate (DMC) (1:1) electrolyte. The other aspect of this study features the assessment of optimal current for the SEI layer formation. For this purpose, five electrode materials were cycled galvanostatically with current densities between 5 and 100 mA g −1 . As observed, the lower current causes the formation of a more resistive SEI layer. Changes in SEI resistance do not necessarily lead to the corresponding changes in diffusion impedance. The current rate of the SEI formation cycle should be correlated not with the system capacitance but rather with the specific surface area of the active material.

Source: Journal of Solid State Electrochemistry

DOI: 10.1007/s10008-025-06347-5

Authors: Agnieszka Swiderska-Mocek, Agnieszka Gabryelczyk, Mikołaj Popławski, Andrzej Lewandowski

Institution: Poznań University of Technology

Language: English

Topic: Advancements in Battery Materials

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,790