Interfacial Evolution and Accelerated Aging Mechanism for LiFePO₄/Graphite Pouch Batteries Under Multi-Step Indirect Activation.

ABSTRACT: The dissolution of iron from the cathode and electrode/electrolyte interface (EEI) during long cycles significantly accelerates the aging process of LiFePO₄ (LFP)/graphite batteries; there is a lack of systematic understanding of the spatial distribution of the EEI interface layer and the dissolve of Fe ions, especially in terms of the mechanism of the cathode-electrolyte interphase (CEI), solid electrolyte interphase (SEI), and iron dissolution. In this study, aged cells were subjected to continuous activation with constant current and multi-step segmented indirect activation (IA) and analyzed for capacity fade, impedance growth, and active Li⁺ mass loss at the EEI and nanoscale levels. The interaction between dissolved Fe²⁺ and the EEI in LFP/graphite pou

SUBMITTER: Liu Y 

PROVIDER: S-EPMC12765781 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature