An advanced “top-down dispersion meets bottom-up synthesis” leads to high performance graphene-based Si LIB anodes. All the reported manufacturing processes are designed to be industrially feasible.
A prominent anodic material of silicon ultranano particles (SiUPs, size < 10 nm) using recycled Si wafer fractures as raw materials and further improvement called top-down dispersion for highcapacitive Li-ion batteries has been addressed originally in this work. Economic benefits and outstanding electrochemical properties, including shorter Li-ion diffusive paths and low-strained effects as a result of the unique ultra-nanometric structure, enable such SiUPs to possess superior advantages for scalable manufacturing procedures as compared to other nanometric Si powders and become the priority of starting materials for Si-based anodes potentially. Meanwhile, an advanced top-down dispersive process has been optimized systematically to prevent severe particles aggregations to ameliorate the electrochemical performance of SiUPs electrodes. In addition to avoiding pre-aggregations, this top-down dispersion brings in adequate buffer spaces, constructed by dispersive media (graphite flakes) and well-dispersive ultrasmall SiUPs nanoclusters (size < 100 nm), alleviating drastic volume variation and local stress during cycling. These improved SiUPs electrodes maintained 1200 mAh g -1 sepcific capacity over 300 cycles under a high current density of 0.8 A g -1 , coupled with ca. 98.5% reversibility. On the basis of these advantages, including low cost, facile manufacture and high performance, this original method provides a pathway to achieve commercial high-capacitive Si-C composite anodes for Li-ion batteries.Please do not adjust margins Please do not adjust margins materials to exclude the simultaneous in-situ powderization and topdown dispersion process. These comparative experiments highlighted the positive effect of the in-situ powderization and topdown dispersion on the electrochemical properties.
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