One‐Step Synthesis of Multi‐Core‐Void@Shell Structured Silicon Anode for High‐Performance Lithium‐Ion Batteries

Abstract

The core‐void@shell architecture shows great advantages in enhancing cycling stability and high‐rate performance of Si‐based anodes. However, it is usually synthesized by template methods which are complex and environmentally unfriendly and would lead to low‐efficiency charge and mass exchange because of the single‐point van der Waals contact between the Si core and the shell. Here, a facile and benign one‐step method to synthesize multi‐Si‐void@SiO2 structure, where abundant void spaces exist between multiple Si cores that are multi‐point attached to a SiO2 shell through strong chemical bonding, is reported. The corresponding electrode exhibits highly stable cycling stability and excellent electrochemical performance. After 200 cycles at a current density of 0.1 A g−1 and then another 200 cycles at 1.2 A g−1, the electrode outputs a specific capacity of 1440 mAh g−1. Even at 2.0 A g−1, it outputs a specific capacity as high as 1182 mAh g−1. Such an anode can match almost all the cathode materials presently used in lithium‐ion batteries. These results demonstrate the multi‐Si‐void@SiO2 as a promising anode to be used in future commercial lithium‐ion batteries of high energy density and high power density.

High-performance Si@C anode for lithium-ion batteries enabled by a novel structuring strategy

“…No peak of Si 0 was found, which is ascribed to a combination of amorphous SiO x plus compact carbon coating and the limited detection depth of XPS (10 nm). 28 However, both Si@FeNO@P and Si@FeNO@P-Et exhibit a weak peak of Si-Si bond in 99.2 eV and a prominent peak of the Si-O bond in the range of 103.2-103.3 eV. This indicates that the porous carbon is conducive to improve the detection efficiency of XPS.…”

Scalable Synthesis of SiOx-TiON Composite As an Ultrastable Anode for Li-Ion Half/Full Batteries

“…Based on the digital images of P-SiO x , SiO x -B, SiO x @TO-10, and SiO x @ TON-10 powders (Figure S2a−d), the color changes of asprepared samples are clearly observed. Furthermore, the particle size distribution of the four samples was studied by using a statistical method, 32 as illustrated in the inset of Figure S2e−h. For the SiO x -B, the diameter is mainly between 3.6 and 5.8 μm (85%), which is smaller than that of P-SiO x (4.4−6.6 μm, 80%).…”

Tight Binding and Dual Encapsulation Enabled Stable Thick Silicon/Carbon Anode with Ultrahigh Volumetric Capacity for Lithium Storage

“…Additionally, incorporating nanostructured Si with carbonaceous materials by interface modification and hollow/porous structure construction can further lead to the achievement of electrode structures with improved specific capacity and long-term cycle life. [31][32][33][34][35][36][37][38][39][40][41][42][43][44] For instance, diverse nanostructured Si/carbon (Si/C) composites have been fabricated in recent years by adopting different carbon sources, such as graphite, [45] pitch, [46] graphene, [47] carbon nanotubes, [48] MOFsderived carbon, [49] biomass-derived carbons, [50] and macromolecular compound-derived carbons, [51] etc. In addition, the combination of multiple carbon components could further relieve the volume expansion of Si and improve the cyclic stability of Si anodes during lithiation and delithiation processes.…”