Core double-shell Si@SiO2@C nanocomposites as anode materials for Li-ion batteries

Abstract

Core double-shell Si@SiO(2)@C nanocomposites were prepared through a facile route. SiO(2) and carbon double shells effectively accommodated the volume swing of Si during repeated cycles and enhanced the electronic network between nanoparticles.

Si@SiOx/Graphene Nanosheets Composite: Ball Milling Synthesis and Enhanced Lithium Storage Performance

“…At the same time, the void space between GNS could favor the diffusion of Li + and electrons and facilitate the accessibility of electrolyte. Finally, though SiOx reduces the reversible capacity and Coulombic efficiency of Si anode, the SiOx layer may improve the adhesion of Si and GNS, so, the cycling stability of Si anode is effectively enhanced (Liwei et al, 2010;Xin et al, 2012). Meanwhile, the generated Li2O can also buffer volume changes.…”

“…On the other hand, SiOx nanocomposites also have attracted considerable attention because the in situ generated Li2O during the first discharge process can buffer the volume changes during lithiation/ delithiation process and further improve the cycling performance of electrode (Hu et al, 2008). For example, core double-shell Si@ SiO2@C nanocomposites were produced through hydrothermal and annealing process, and displayed stable cycling performance even in the VC-free electrolyte (Liwei et al, 2010). Furthermore, some groups also successfully prepared SiOx anodes with great cycle performances (Guo et al, 2012;Xin et al, 2012).…”

Electrochemical Charge Transfer Reaction Kinetics at the Silicon-Liquid Electrolyte Interface

“…4,25 The general trend toward nanoscaling of silicon has been motivated almost entirely by these considerations. Novel electrode architectures 13,16,[26][27][28][29][30][31][32] and cycling regimes have been developed to limit capacity fade, 4,23 and modeling 22 can guide the design of fracture-resistant microstructures. However, an equally important, and to our knowledge overlooked consideration, is the high interfacial current density (current per area of particle/liquid electrolyte interface) required to access the exceptionally high volumetric capacity of Si (8.3 Ah/cm 3 vs. 0.84 Ah/cm 3 for graphite).…”

A Carbon Nanotubes-Silicon Nanoparticles Network for High Performance Lithium Rechargeable Battery Anodes

“…Having noticed that Si-carbon composites could also alleviate the contact loss with conducting agent, [19][20][21][22][23][24] in the present study, we develop a composite structure consisting of Si nanoparticles (NPs) and carbon nanotubes (CNTs). In particular, as an effort to develop an organized structure, CNTs were grown via a chemical vapor deposition (CVD) process to homogenously surround Si NPs and thus to ensure robust contacts between both components.…”

“…17,18) Although these nanostructures have exhibited promising electrochemical performances, nanoparticles composited with carbon materials might be one of the most viable options for large-scale production. [19][20][21][22] Other morphologies require relatively more complicated or more expensive synthetic procedures which might not be acceptable in large quantity production.…”