Graphene as an Interfacial Layer for Improving Cycling Performance of Si Nanowires in Lithium-Ion Batteries

Abstract

Managing interfacial instability is crucial for enhancing cyclability in lithium-ion batteries (LIBs), yet little attention has been devoted to this issue until recently. Here, we introduce graphene as an interfacial layer between the current collector and the anode composed of Si nanowires (SiNWs) to improve the cycling capability of LIBs. The atomically thin graphene lessened the stress accumulated by volumetric mismatch and inhibited interfacial reactions that would accelerate the fatigue of Si anodes. By simply incorporating graphene at the interface, we demonstrated significantly enhanced cycling stability for SiNW-based LIB anodes, with retentions of more than 2400 mAh/g specific charge capacity over 200 cycles, 2.7 times that of SiNWs on a bare current collector.

1D Nanomaterials: Design, Synthesis, and Applications in Sodium–Ion Batteries

“…CVD is an especially attractive method to produce 1D nanostructured materials. Semiconductor (such as Si, Ge) nanowires are the most common 1D nanomaterials prepared by CVD . In the typical process, the foreign metal nanoparticles can catalyze the decomposition of the semiconductor‐containing gas, as well as promote 1D growth.…”

Critical thickness of phenolic resin-based carbon interfacial layer for improving long cycling stability of silicon nanoparticle anodes

“…[4][5][6][7] Surface modification of electrode materials by coatings are effective approaches to avoid the direct contact with electrolyte and suppress the structure transformation, thus minimizing the side reaction originated from the electrode/electrolyte interfaces, guaranteeing the structural stability and enhancing the battery performances while preventing the fast decay in capacity. [8][9][10][11][12][13] Of the various currently available coating materials, carbon encapsulated on the surface of active electrode materials, rather than simply mixing, has been demonstrated as a promising way to increase the cycling life in all-solid-state batteries. [4,10,14,15] The additional benefit is that the carbon coating layer can provide superior electronic conductivity.…”

Effect of Silicon Crystallite Size on Its Electrochemical Performance for Lithium‐Ion Batteries

“…Therefore, Si electrode shows poor cycle stability. To mitigate Si electrode degradation, nanostructured Si materials, such as nanoparticles, nanowires, and nanorods, have been utilized as the active material. It has also been reported that Si anodes with smaller crystallite size show better electrochemical performance for LIBs, and Si with different particle diameters has been used in the previous reports .…”