Controlled synthesis of yolk–mesoporous shell Si@SiO₂nanohybrid designed for high performance Li ion battery

Abstract

Yolk–mesoporous shell Si@SiO2nanohybrids with controllable shell thickness were preparedviaa facile vesicle-template method, which exhibit good cycle performance and excellent rate capabilities.

Facile Fabrication of 3D SiO2@Graphene Aerogel Composites as Anode Material for Lithium Ion Batteries

“…The XPS Si 2p spectrum of SiO 2 @GA composites shows a strong peak at about 103.4 eV, suggesting the formation of SiO 2 (Fig. 7c) [42]. As shown in Figure 7 d, both Raman spectra of GA and SiO 2 @GA composites exhibit two obvious peaks corresponded to the disordered D and G bands of carbon.…”

Resilient Yolk–Shell Silicon–Reduced Graphene Oxide/Amorphous Carbon Anode Material from a Synergistic Dual‐Coating Process for Lithium‐Ion Batteries

“…To understand the increased stability of the YS‐Si@rGO/a‐C anode, Nyquist and electrochemical impedance spectroscopy (EIS) plots, performed on both YS‐Si@rGO/a‐C and YS‐Si@a‐C anodes after 101 cycles in the charged state, were conducted (Figure c). The curves were modeled by using an equivalent circuit as shown in the insert of Figure c, R S represents the impedance from ohmic contributions; R SEI represents the impedance of Li transport through the SEI, and R ct is the charge‐transfer resistance . R S for cycled YS‐Si@a‐C and YS‐Si@rGO/a‐C anodes were found to be 4 and 2 Ohms, respectively.…”

Cu3Si@Si core–shell nanoparticles synthesized using a solid-state reaction and their performance as anode materials for lithium ion batteries

“…[10][11][12][13] Microporous carbon coated Si 30 nanocomposites with core-shell structure were fabricated by insitu polymerization followed by carbonization method. 15 Double-walled core-shell structure Si@SiO 2 @C nanocomposites were prepared by calcination of Si nanoparticles in air and subsequent carbon coating and exhibit a reversible 40 capacity of 786 mA h g -1 at a current density of 0.1 A g -1 after 100 cycles. 14 Si@SiO 2 core-shell nanocomposites were synthesized 35 by a vesicle template method, which showed a capacity retention of 687 mA h g -1 at the current density of 0.05 A g -1 after 30 cycles.…”

“…2e-g) clearly disclose that part of Cu atoms came up on the surface of Si particles. 3a exhibits the typical cyclic voltammetry (CV) curves of Cu 3 Si@Si core-shell nanoparticles from 1st to 5th cycle at a scanning rate of 0.1 mV s - 15 1 in the potential window of 0.01-1.5 V vs. Li/Li + . 2h-j) of the products (Sample-6 h) show that more Cu atoms have deeply diffused into the Si particles.…”

“…3d comparatively 15 describes the cycling performance of the three electrodes at a current of 1 A g -1 . Fig.…”