Rational Design of Si@SiO₂/C Composites Using Sustainable Cellulose as a Carbon Resource for Anodes in Lithium-Ion Batteries

Abstract

In this work, we propose a novel and facile route for the rational design of Si@SiO/C anode materials by using sustainable and environment-friendly cellulose as a carbon resource. To simultaneously obtain a SiO layer and a carbon scaffold, a specially designed homogeneous cellulose solution and commercial Si nanopowder are used as the starting materials, and the cellulose/Si composite is directly assembled by an in situ regenerating method. Subsequently, Si@SiO/C composite is obtained after carbonization. As expected, Si@SiO is homogeneously encapsulated in the cellulose-derived carbon network. The obtained Si@SiO/C composite shows a high reversible capacity of 1071 mA h g at a current density of 420 mA g and 70% capacity retention after 200 cycles. This novel, sustainable, and effective design is a promising approach to obtain high-performance and cost-effective composite anodes for practical applications.

Si/SiOx Nanoparticles Embedded in a Conductive and Durable Carbon Nanoflake Matrix as an Efficient Anode for Lithium‐Ion Batteries

“…The wide scan survey spectrum is shown in Figure S2(a), and the peaks at 532, 285, 155, and 104 eV correspond to O 1s, C 1s, Si 2 s, and Si 2p, respectively. [40] These results suggest that the sample includes a combination of Si, O, and C. High-resolution O 1s spectra are separately shown in Figure S2(b). The curvefitting method was used to differentiate the chemical states of C and Si.…”

Structure and conductivity enhanced treble-shelled porous silicon as an anode for high-performance lithium-ion batteries

“…It should be mentioned that an appropriate thickness of the silicon oxide layer is vital for the electrochemical performance of the Si anode. 34 The silicon oxide layer can maintain the structure stability of porous Si during multiple cycles; however, a thick silicon oxide layer will consume too much of the lithium source, resulting in the lowering of the initial coulombic efficiency and a poor electrical conductivity. In addition, the EDS elemental line scanning of Ag nanoparticle-coated porous Si (Fig.…”

Silicon Anodes for High‐Performance Storage Devices: Structural Design, Material Compounding, Advances in Electrolytes and Binders

“…Covering one carbon layer on the surface of the silicon film can effectively improve the material‘s ability to resist mechanical stress . The use of low‐cost petroleum pitch and cellulose as precursors to synthesize silicon‐carbon composites in a simple manner obtains considerable reversible capacity and excellent cycle stability . In addition, the use of organic molecules as a carbon source is also a common means of synthesizing silicon‐carbon composites.…”