Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
236267 | Powder Technology | 2014 | 4 Pages |
•Electrostatic attraction provides the driving force for self-assembly.•We use porous-graphite replacing graphene to encapsulate silicon.•The electrochemical performance of the composites have been improved.
The self-assembly of porous-graphite/silicon/carbon composites is fabricated by electrostatic attraction in solvent and pyrolysis method. Silicon carries a positive charge after surface modification and porous-graphite carries a negative charge after oxidation. Transmission electron microscopy reveals some Si nanoparticles encapsulated in pores of porous-graphite. X-ray diffraction shows that the structure of porous-graphite and silicon are not destroyed during oxidation of the graphite and surface modification of the silicon with APTES. Galvanostatic charge/discharge tests demonstrate that porous-graphite/silicon/carbon composites have much higher reversible charge capacity than flake graphite and better capacity retation than pristine silicon. The composites exhibit an initial reversible charge capacity of 778.8 mAh · g− 1.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide