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Scalable Fabrication of Silicon‐Graphite Microsphere by Mechanical Processing for Lithium‐Ion Battery Anode with Large Capacity and High Cycling Stability

Von Wiley-VCH zur Verfügung gestellt

Towards better silicon-graphite anode: A two-step mechanical strategy is investigated for silicon-graphite microsphere anode at a large scale. The Si−G microsphere formed by assembly of tightly interconnected silicon nanoparticles and graphite nanosheets, performs a high reversible capacity of 1895 mAh g−1 at a current density of 0.5 A g−1 and a capacity retention of 99.8 % over 500 cycles.


Abstract

In order to combine the high stability of graphite and the large theoretical capacity of silicon, silicon-graphite composites attract tremendous attentions. However, the cycling stability is still a bottleneck hindering their commercialization due to the large volume expansion and poor interface compatibility. In this study, the bead grinding method is used to break micro-sized silicon and graphite particles by strong shear force simultaneously, inducing the solid-solid interface reaction between fresh silicon nanoparticles and graphite nanosheets. Subsequently, an evaporation induced self-assembly happens in spray drying process, allow for scalable synthesis of Si-graphite microsphere. The silicon-graphite microsphere (Si−G microsphere) delivers an excellent cycling performance, with a reversible capacity of 1895 mAh g−1 at a current density of 0.5 A g−1 over 500 cycles and a capacity retention of 99.8 %. Moreover, the pouch-type full battery of Si−G microsphere/graphite||LiNi0.5Co0.2Mn0.3O2 exhibits remarkable cycling stability with the capacity retention of 79.3 % after 800 cycles. The manufacture process using commercial raw materials and simple mechanical strategy demonstrates great potential for the low-cost and scaled synthesis of high-performance silicon-graphite anodes.

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