Facile Synthesis of Porous Silicon Nanofibers by Magnesium Reduction for Application in Lithium Ion Batteries.
We report a facile fabrication of porous silicon nanofibers by a simple three-stage procedure. Polymer/silicon precursor composite nanofibers are first fabricated by electrospinning, a water-based spinning dope, which undergoes subsequent heat treatment and then reduction using magnesium to be converted into porous silicon nanofibers. The porous silicon nanofibers are coated with a graphene by using a plasma-enhanced chemical vapor deposition for use as an anode material of lithium ion batteries. The porous silicon nanofibers can be mass-produced by a simple and solvent-free method, which uses an environmental-friendly polymer solution. The graphene-coated silicon nanofibers show an improved cycling performance of a capacity retention than the pure silicon nanofibers due to the suppression of the volume change and the increase of electric conductivity by the graphene.
School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA.
Daehwan
D
Cho
School of Electrical and Computer Engineering, Cornell University, Ithaca, NY, 14853, USA.
Moonkyoung
M
Kim
School of Electrical and Computer Engineering, Cornell University, Ithaca, NY, 14853, USA.
Jeonghyun
J
Hwang
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Jay Hoon
JH
Park
School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA.
Yong Lak
YL
Joo
Department of Organic Materials and Fiber Engineering, Soongsil University, Seoul, 156-743, Korea. yjeong@ssu.ac.kr.
Youngjin
Y
Jeong
Electrospinning; Graphene; Lithium ion batteries; Magnesium reduction; Porous silicon nanofibers