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Authors

HUH, YOOMIN

Issue Date

2026-08

Citation

논문 Pre-print, v., no., pp.-

Journal Title

Pre-print

DOI

10.2139/ssrn.6695427

Abstract

<jats:p>Micro-sized silicon particle (SiMP) anodes offer high practical energy density and good manufacturing compatibility for lithium-ion batteries but suffer from severe volume expansion and interfacial instability during cycling. Herein, we report a simple and scalable interfacial engineering strategy to stabilize SiMP anodes by post-coating pre-fabricated electrodes with a water-processable poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and poly(acrylic acid) (PAA) mixture as a functional overlayer. The conformal PEDOT:PSS/PAA (P:PP) layer simultaneously provides mechanical buffering and electronic conduction, enabling homogeneous current distribution and regulated interfacial reactions. As a result, the P:PP-coated anode exhibits markedly improved cycling stability and rate capability, along with reduced interfacial resistance compared to the bare Si anode. Morphological analyses reveal that deformation and electrode thickening are effectively constrained beneath the P:PP layer, preserving macroscopic surface planarity and mitigating the electrical isolation of fractured Si fragments. Furthermore, post-mortem analyses indicate that the P:PP overlayer promotes the formation of a LiF-rich solid-electrolyte interphase with reduced accumulation of fluorophosphate species, suggesting more effective interfacial passivation. Notably, the P:PP-coated SiMP anode retains ~80% of its capacity (~2,160 mAh g-1) after 150 cycles at 0.5C (2.1 A g-1), highlighting the effectiveness of this scalable aqueous post-coating strategy for durable, high-capacity Si anodes under practical conditions.</jats:p>