Prompt microwave-assisted synthesis of carbon coated Si nanocomposites as anode for lithium-ion batteries

Abstract

Hard carbons derived from glucose and glucosamine are synthesized via microwave-assisted hydrothermal carbonization (HTC) and subsequent pyrolysis treatment to be used as anode materials for lithium-ion batteries (LIBs). Related to the limited lithium ion intercalation to graphite (LiC 6 ) resulting relatively low theoretical capacity (372 mAh/g), silicon is considered as one of the most appealing anode materials for LIBs by exhibiting very high theoretical capacity (3578 mAh/g, based on Li 15 Si 4 ).However, silicon suffers from huge volume expansion during intercalation of lithium ions which causes rapid capacity fading. One of the most practical strategy to suppress this problem is to coat the silicon nanoparticles with carbonaceous materials. Herein, silicon is coated via microwave-assisted hydrothermal carbonization method in the presence of glucose or glucosamine which are then further pyrolyzed at 750 °C to obtain silicon-carbon composite anodes. Composite containing glucosamine (Si-GA-C-750) enables N-doped carbon evidenced by EDX and XPS analyses which contributes to obtain much enhanced electrochemical properties than that of glucose containing composite (Si-G-C-750).Additionally, higher Li + diffusion coefficient and smaller resistance values attest the advantageous nature of the N-doped anode material.

A Flame-Retardant and Insoluble Inorganic–Organic Hybrid Cathode Material Based on Polyphosphazene with Pyrene-Tetraone for Lithium Ion Batteries

“…The characteristic Nyquist diagrams of PPAPT and PTO are shown in Figure S9a,b. R1, R2, R3, Q1, Q2, and W components of the proposed equivalent circuit (inset picture in the Figure S9) refer to electrolyte resistance, solid electrolyte interphase, charge transfer resistance, polarization of the surface layer, electrical double layer capacitances, and Warburg impedance, respectively . For pristine PPAPT , EIS data were fitted and found R1 as 5.2 Ω, R2 as 77.6 Ω, and R3 as 47.7 Ω with the total resistance of R total : 130.5 Ω.…”

In Situ Microwave Synthesis of SnO2‐Porous Biomass Carbon as Anode Materials for Lithium‐Ion Batteries

“…In addition, microwave irradiation is extensively investigated because of its fast reaction rates, energy‐saving property, and simplicity. [ 30 ]…”

“…In addition, microwave irradiation is extensively investigated because of its fast reaction rates, energy-saving property, and simplicity. [30] The structures and morphologies of the prepared carbonized absorbent cotton fiber were investigated by SEM. SEM images of the carbonized absorbent cotton fiber without any treatment are shown in Figure 3a-c.…”

Research Progress on Coating Structure of Silicon Anode Materials for Lithium‐Ion Batteries

“…For example, the hydrothermal (or solvothermal) method does not affect the properties of the material itself, and the process (equipment) is simple and easy to operate, thus gaining increasing attention recently. The reaction conditions of hydrothermal (or solvothermal) can be easily controlled via simple regulation of parameters such as temperature, time, or addition of surfactants, rendering more possibilities for material design [34–37] . Wang et al [38] .…”

“…Subsequently, many different composite structures have been developed based on carbon materials, of which the encapsulation structure is a research hotspot that has been confirmed to significantly improve the lithium storage performance of silicon‐based materials [48–51] . Generally, the Si/C composites can be divided into 0D (monodisperse nanoparticles), [34,39,49,52–72] 1D (nanofibers and nanotubes), [35,40,73–80] 2D [graphene (G) sheet], [36,41,81–88] and 3D (graphene shell and porous structure) [38,89–99] material according to the encapsulation structure.…”