Surface-Functionalized Silicon Nanoparticles as Anode Material for Lithium-Ion Battery

Abstract

An epoxy group was successfully attached to the surface of silicon nanoparticle (SiNPs) via a silanization reaction between silanol-enriched SiNPs and functional silanes. The epoxy-functionalized SiNPs showed a much improved cell performance compared with the pristine SiNPs because of the increased stability with electrolyte and the formation of a covalent bond between the epoxy group and the polyacrylic acid binder. Furthermore, the anode laminate made from epoxy-SiNPs showed much enhanced adhesion strength. Post-test analysis shed light on how the epoxy-functional group affects the physical and electrochemical properties of the SiNP anode.

Recent Applications of Molecular Structures at Silicon Anode Interfaces

“…Functionalized COFs could Reactive monolayers have also been reported for the application of Si anodes. Jiang et al [86] developed epoxy monolayers on Si nanoparticles that were produced via silanization reaction between epoxy-trialkoxysilane precursors and silanol-enriched Si nanoparticles. The epoxy monolayer helped to improve the Si anode performance by forming covalent bonding with polyacrylic acid (PAA) binder and by preventing the parasitic reactions of electrolyte.…”

Chemical Coupled PEDOT:PSS/Si Electrode: Suppressed Electrolyte Consumption Enables Long-Term Stability

“…However, SEI regeneration will overconsume electrolytes, resulting in sudden battery death. An ideal solution would be creating an artificial SEI on Si via an organic/ polymer coating layer [7][8][9][10], which can effectively control the contact between electrolyte and active material. Nevertheless, the artificial SEI is usually insulating that cannot transfer both Li + and electrons well.…”

Si/FeSi2 Nanoparticles Prepared by Thermal Plasma with Stress‐releasing Effect for Li‐ion Storage

“…Various methods have been developed to settle these problems, such as reducing the size of Si particles to nanoscale, [12–14] building the coating layer, [15,16] doping hetero‐element, [17–19] designing porous structure, [20–22] and introducing inert components [23–26] . Simultaneously, carbon materials received extensive research as coating layer for Si anode materials due to its high conductivity, superior structural stability (negligible volume expansion), and stable SEI layers.…”