Electrospinning Preparation of Nanosilicon/Disordered Carbon Composite as Anode Materials in Li-Ion Battery

Preparation and characterization of flake graphite/silicon/carbon spherical composite as anode materials for lithium-ion batteries

“…However, large volume change (>300%), occurring in the Si-based anodes during the process of Li + insertion/extraction, leads to high internal stress, electrode pulverization and subsequent loss of electrical contact between the active material and current collector, finally resulting in poor cycling stability of Si-based anodes [3,7]. To improve the stability of silicon-based anodes, silicon/carbon composite anodes attract great interest because of the good electrical conductivity and stress-buffer nature of carbon, such as Si-graphite [8], Si-disordered carbon [9], Si-MCMB [10], Si-carbon nanotubes [11], Si-graphene [12], Si-carbon aerogel [13], and Si-graphitedisordered carbon [14], especially those in which the nanosized silicon was uniformly dispersed within active matrix [15]. As a result, the types of carbon sources and the preparing methods of Si/C composite anodes seem to be quite important for producing a Si/C composite anode with good electrochemical performance.…”

“…As a result, the types of carbon sources and the preparing methods of Si/C composite anodes seem to be quite important for producing a Si/C composite anode with good electrochemical performance. On the basis of the preparation methods, they can be mainly classified into five categories, i.e., pyrolysis [9,16] or chemical/thermal vapor deposition [17], in situ polymerization and pyrolysis [18,19], mechanical milling and pyrolysis [20], chemical reaction of gels [21], and other methods such as dehydration of a carbon precursor [22]. Excluding those above, spray drying and subsequent pyrolysis is also supposed to be an effective way in preparing spherical particles with homogeneous distribution of chemical composition and improving the tap density and electrochemical performances of the electrode materials [14].…”

Conformal Surface Coatings to Enable High Volume Expansion Li‐Ion Anode Materials

“…Many methods employ alternative binderfree and 3-D cell constructions, such as thin film, [4][5][6] nanoarrays, [7][8][9] and embedded composites and membranes. [10,11] Although higher reversible capacities using alternative cell architectures have been achieved, most of these formats are not yet plausible for large scale, commercial, roll-to-roll processing.…”

Si/C nanocomposite anode materials by freeze-drying with enhanced electrochemical performance in lithium-ion batteries

“…On the one hand, the graphite in the nano-Si/C material and the fluffy structure introduced by freeze-drying acted as a framework to stabilize the electrode structure during lithiation and delithiation. On the other hand, the coated carbon with uniform distribution could prevent forming nonuniform SEI layer at the beginning of insertion of Li + on the surface of Si particles [17][18][19]. Figure 2c shows the Nyquist plots of the nano-Si/C and Si/C samples discharged to 0.09 V vs. Li/Li + after the first cycle.…”

“…Graphite, mesophase microbeads, pyrolyzed polyvinyl chloride, and other carbonaceous materials have been used as carbon source for Si-based anode materials [14][15][16]. The carbon phase in the Si/C composites acts as both of a structural buffer and an electrochemically active material because of its softness, good electronic conductivity, and much smaller volume expansion [17][18][19]. Numerous methods have been employed in preparing Si/C composite anodes, including mechanical milling, chemical/thermal vapor deposition, and the sol-gel method [18,20,21].…”