Graphene Nanoscrolls with Confined Silicon Nanoparticles as a Durable Anode for Lithium‐Ion Batteries

Abstract

Silicon anodes have been given great focus due to the unparalleled theoretical specific capacity. However, destructive volume expansion during lithiation/delithiation processes and intrinsic inferior electrical conductivity cause drastic capacity decay. Forming composites with conductive and stretchable material is an effective solution to address these problems. Here, a three‐dimensional continuous conductive network consisting of one‐dimensional flexible graphene nanoscroll wrapped silicon nanoparticles (Si@GNS) is realized by a simple cold quenching method followed by a facile annealing process. GNS acted as conductive framework and elastic buffer layer, improving electrochemical reaction kinetics and suppressing Si volume expansion, respectively. Hence, Si@GNS shows excellent rate capability of 760 mAh g−1 even at 2 A g−1 and long‐term cycling stability of 81.5% capacity retention after 1000 cycles.

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

“…Si as anode materials for Li‐ion batteries (LIBs) have been extensively studied by researchers due to its high theoretical specific capacity, non‐toxic and productive reserves [1–3] . However, the most vital problem of Si materials restricting their commercial LIBs application is the dramatic volume expansion (>300%) during the charge/discharge process [4–6] . The lithiation process of Si causes increase stress on the outer surface of the Si particles, leading to breakage of silicon particles, thick solid electrolyte interphase (SEI) layer overgrowth, and drastic capacity reduction [7] .…”

Conducting Nanofibers: Diagonal Scrolling of 2D Nanosheets into 1D Nanostructures via In Situ Self-Assembly

“…Two-dimensional (2D) layered nanostructures have shown substantial performance toward flexible electronics and magnetism owing to their unique physicochemical and electronic properties. − Subsequently, one-dimensional (1D) nanotubes, nanowires, and nanoscrolls (carbon, graphene oxide, and porphyrin) arising from scrolling of 2D nanosheets that are employed as novel nanostructures with enhanced mechanical properties have robust applications in optoelectronics, energy storage, and tissue engineering. − Over time, synthetic carbon allotropes such as graphene nanosheets and carbon nanotubes play a superior role in nanotechnology and chemotherapy − In this context, 2D nanomaterials are considered the foremost building blocks to generate 2D and 1D nanostructures via self-assembly; however, this methodology is restricted to inorganic oxides and a few organic π-conjugated systems thus far. − For example, Aida et al comprehensively investigated the transformation of amphiphilic HBC derivatives from nanosheets to nanotubes, yet their molecular structures mimic a small portion of the 2D graphene sheet. − Although a few other reports demonstrated the nanostructural transition from 2D to 1D, in situ self-assembly into graphitic nanotubes is hitherto unknown. Thus, the rational design strategy of feasible organic materials is obligatory to control the dimensionality of 2D and 1D nanostructures.…”