The present study describes a novel strategy for preparing thin Silicon 2D and 3D electrodes for\nlithium ion batteries by a spin coating method. A homogeneous and stable suspension of Si nanoparticles\n(SiNPs) was prepared by dispersing the nanoparticles in 1-methyl-2-pyrrolidone (NMP) or in the room\ntemperature ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (Pyr14TFSI).\nThis proposed methodology was successfully employed to prepare 2D and 3D with different aspect ratios\nelectrodes. Both 2D and 3D materials were then used as anode materials. The 2D SiNPs anodes exhibit\na high reversible capacity, which is close to 3500 mAhÃ?·gâË?â??1 at C/10. For a higher discharge rate, the\ncapacity of the 2D anode is considerably improved by dispersing the nanoparticles in Pyr14TFSI instead\nof NMP solvent. In order to further improve the anode performances, graphene particles were added\nto the SiNPs suspension. The anodes prepared using this suspension method exhibit relatively low\ncolumbic efficiency during the first few cycles (less than 30%) and low reversible capacity (2800 mAhÃ?·gâË?â??1\nat C/10). The 3D SiNPs (NMP) electrode shows a higher intensity during cyclic voltammograms and a\nbetter stability under galvanostatic cycling than the 2D SiNPs (NMP) electrode.
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