The synergistic effects of combining the high energy mechanical milling and wet milling on Si negative electrode materials for lithium ion battery

Mechanochemical synthesis of Si/Cu3Si-based composite as negative electrode materials for lithium ion battery

“…Figure 1 illustrates the synthesis for Si/Cu 3 Si-based composite powder. First, Mixture of micrometric Si P , CuO and VGCF was high energy mechanically milled to reduce particle size, which induces amorphizing to form micro-sized SCV H aggregate (nanocrystalline/amorphous phases) 23 . Meanwhile, high energy impacting supposedly leads CuO to decomposing and alloying with Si to form amorphous Cu-Si solid solution.…”

“…S3(a) and (b) online present the cyclic voltammetry curves of first and second cycle for SCV H+W , C-SCV H+W and Si H+W , respectively in a voltage window of 0.005 to 2.0 V at a scan rate of 0.1 mV s −1 . Here, Si H+W 23 is pure Si processed high mechanical milling and wet milling as the one of SCV H+W . Accordingly, onset voltage of first cathodic curves is 0.36 V for SCV H+W and 0.13 V for C-SCV H+W , corresponding to observation of steep potential dropping for C-SCV H+W as shown in Fig.…”

“…HEMM reduce powder size, induce crystallite amorphizing and enable alloying reaction under non-equilibrium driven by high mechanical energy 22 . In our previous work, submicro-sized Si aggregate of nanocrystalline/amorphous phases prepared by combining HEMM with wet milling treatments improve Si negative electrode performance 23 . In this work, Cu 3 Si compound is further synthesized by mechanochemical reaction between CuO and Si upon HEMM.…”

Top‐Down Synthesis of Silicon/Carbon Composite Anode Materials for Lithium‐Ion Batteries: Mechanical Milling and Etching

“…Recently, the HEMM process has been demonstrated in powder metallurgy technology as an efficient technique that can be used for large‐scale production of a variety of nanostructured materials and has been widely used to synthesize nano‐Si based anode materials to relieve the huge volume changes of Si anodes for LIBs. For example, nanosized Si with a particle size around 150 nm can be prepared at a large scale through HEMM from cheap and abundant microsized low‐grade Si sources (metallurgical Si: ∼99 wt % Si at a cost of ∼$1 kg −1 and ferrosilicon: ∼83 wt % Si and ∼13 wt % Fe, costing ∼$0.6 kg −1 ) .…”

Cyclability evaluation on Si based Negative Electrode in Lithium ion Battery by Graphite Phase Evolution: an operando X-ray diffraction study

“…Meanwhile, crashed Si powders exposes fresh surface to electrolyte thus causing overgrowth of solid electrolyte interface (ESI). In past decades, improvements in the cyclability and rate capability of silicon negative electrodes have been demonstrated by reducing particle size to the nanoscale 10 , seeking conductive coatings 11 or conductive networks 12 , providing void space to accommodate volume expansion 13 , and introducing highly elastic phases to mitigate the deleterious effect of large volume changes 14,15 . Regardless of attempts been utilized, cyclability of LIB has been partially improved and is still far from criteria of the commercialization.…”