Enhanced Electrochemical Performance of Heterogeneous Si/MoSi₂ Anodes Prepared by a Magnesiothermic Reduction

Abstract

This work explores facile synthesis of heterogeneous Si/MoSi2 nanocomposites via a one-step magnesiothermic reduction. MoSi2 serves as a highly electrically conductive nanoparticle that has several advantages of electrochemical properties, which is formed through the absorption of local heat accumulation generated by magnesiothermic reduction. As a result, the Si/MoSi2 nanocomposites exhibit excellent electrochemical performance, showing initial charge capacity of 1933.9 mA h g(-1) at a rate of 0.2 C and retaining 85.2% after 150 cycles. This work using local heat accumulation generated by magnesiothermic reduction demonstrates a large-scale method for producing high-performance Si-based anode materials, which could provide referential significances for other materials.

Direct Growth of Si, Ge, and Si–Ge Heterostructure Nanowires Using Electroplated Zn: An Inexpensive Seeding Technique for Li‐Ion Alloying Anodes

“…The performance at high C-rates is comparable to those previously reported for nanostructured Si including Au-seeded Si NWs and Si NPs. [57,58] Rate capability testing performed using the Ge and Si-Ge heterostructure NW electrodes are shown in Figure S10b,c in the Supporting Information. These results highlight the improvement in the percent capacity retention at higher C-rates of Ge compared to Si NW electrodes.…”

Revisiting the Preparation Progress of Nano‐Structured Si Anodes toward Industrial Application from the Perspective of Cost and Scalability

“…Wu et al. [ 109 ] simply synthesized heterogeneous Si/MoSi 2 nanocomposites (Figure 8g) by one‐step MR, and the Si/MoSi 2 composites greatly improved the multiplicative properties of the material due to the addition of MoSi 2 (Figure 8h), but its excellent rate performance could not cover its low load of 0.46–0.54 mg cm −2 . MoSi 2 was a highly conductive nanoparticle with the advantage of multiple electrochemical properties, which was formed by absorbing the local thermal accumulation generated by the MR.…”

“…The four types of nanostructured Si and their preparation methods are summarized in Figure 1 . [ 71–75 ] The fabrication methods of 0D nanoparticles mainly include: Ball milling method, [ 76–78 ] plasma enhanced chemical vapor deposition (PECVD) technology, laser‐induced chemical vapor deposition (LICVD) technology, [ 79 ] radio frequency thermal plasma (RFTP) technology, [ 80–82 ] and solution synthesis method; [ 83–86 ] the fabrication processes of 1D nanowires and nanotubes mainly include: Vapor deposition method, [ 87–91 ] chemical etching method, [ 92,93 ] molten salt electrolysis (MSE) [ 94–97 ] and template method; [ 98,99 ] 2D thin‐films are mainly prepared by vapor deposition technology, [ 100,101 ] and magnetron sputtering technology; [ 102 ] 3D porous structure is the hot spot of research, and the synthesis routes mainly include: de‐alloying method for Si metal alloy, [ 103–108 ] magnesium thermal reduction method, [ 109 ] chemical etching, [ 110–112 ] magnesium evaporation method, [ 113,114 ] etc. In addition to these main methods above, there are some infrequent methods such as SiHCl 3 reduction method, [ 115,116 ] laser burning method, [ 117 ] electrostatic spinning, [ 118 ] and so on.…”

Dimensionally Designed Carbon–Silicon Hybrids for Lithium Storage

“…As engineering micro‐Si into a porous structure has been shown capable of improving the cyclic performance, the hybridization of porous micro‐Si and carbon materials represent an effective strategy to further enhance the lithium storage performance. Several promising synthesis routes have been consistently adopted to construct porous Si anode materials, such as chemical etching, solvothermal or hydrothermal reactions .…”