Monodisperse porous silicon spheres as anode materials for lithium ion batteries

Scientific Reports
Wei WangCengiz S Ozkan

Abstract

Highly monodisperse porous silicon nanospheres (MPSSs) are synthesized via a simple and scalable hydrolysis process with subsequent surface-protected magnesiothermic reduction. The spherical nature of the MPSSs allows for a homogenous stress-strain distribution within the structure during lithiation and delithiation, which dramatically improves the electrochemical stability. To fully extract the real performance of the MPSSs, carbon nanotubes (CNTs) were added to enhance the electronic conductivity within the composite electrode structure, which has been verified to be an effective way to improve the rate and cycling performance of anodes based on nano-Si. The Li-ion battery (LIB) anodes based on MPSSs demonstrate a high reversible capacity of 3105 mAh g(-1). In particular, reversible Li storage capacities above 1500 mAh g(-1) were maintained after 500 cycles at a high rate of C/2. We believe this innovative approach for synthesizing porous Si-based LIB anode materials by using surface-protected magnesiothermic reduction can be readily applied to other types of SiOx nano/microstructures.

References

Jul 26, 2008·Nature Nanotechnology·Candace K ChanYi Cui
Jan 6, 2012·ACS Nano·Xiao Hua LiuJian Yu Huang
Jan 18, 2013·Nano Letters·Matthew T McDowellYi Cui
Apr 16, 2014·Scientific Reports·Zachary FavorsCengiz S Ozkan
Jul 9, 2014·Scientific Reports·Zachary FavorsCengiz S Ozkan

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Citations

May 10, 2017·ACS Applied Materials & Interfaces·John B CookSarah H Tolbert
Oct 11, 2016·Chemical Communications : Chem Comm·Changling LiCengiz S Ozkan
May 21, 2018·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Hyeonglim SeoYoungbok Lee
Oct 13, 2018·Chemical Communications : Chem Comm·Xiangyang ZhouJingjing Tang
Apr 21, 2017·Scientific Reports·Changling LiCengiz S Ozkan
Feb 23, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Matea RaićMile Ivanda

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Methods Mentioned

BETA
X-ray
ESR
scanning
transmission electron microscopy

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