Direct Observation of Cycle and Temperature Effects on Surface Film Morphology of Graphite Negative Electrode by In-situ Electrochemical AFM
Year: 2025
Type: article
Abstract: This study investigated the stability of the surface film of the negative electrode by investigating how temperature affects the morphology of the surface film of the negative electrode using in-situ electrochemical atomic force microscope (AFM) in LiPF6-based electrolytes with the addition of vinylene carbonate (VC) or by replacing LiPF6 with lithium bis(fluorosulfonyl)imide (LiFSI). AFM measurements revealed that, in the case of the LiPF6-based electrolyte, blisters were generated by the reductive decomposition of the electrolyte at the step edge of the negative electrode, grew larger as the storage temperature increased up to 45 °C, and collapsed at 55 °C. The surface film with blisters was partially broken down at 65 °C. Conversely, with VC addition or LiFSI substitution, no blister collapse and film dissolution were observed, even when the temperature was raised to 65 °C.
Source: Electrochemistry
Authors: Yasushi UEBOU, Yoshihiko SATO, Takeshi SASAKI
Institution: GS Yuasa (Japan)
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,130
OpenAlex ID: W4408044255