Electrosprayed silicon-embedded porous carbon microspheres as lithium-ion battery anodes with exceptional rate capacities

Gemeng Liang, Xianying Qin, Jinshuo Zou, Laiyan Luo, Yunzhe Wang, Mengyao Wu, Hua Zhu, Guohua Chen, Feiyu Kang, Baohua Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

107 Citations (Scopus)

Abstract

Silicon-embedded porous carbon microspheres with an exceptional conductive framework for ions and electrons were obtained by electrospraying a mixed polymer solution of polystyrene and polyvinylpyrrolidone, containing silicon nanoparticles, carbon nanotubes and carbon blacks, and subsequent heat treatment. In the composite microspheres, silicon particles were embedded in the porous carbon framework composed of interwoven carbon nanotubes, filled carbon blacks and interconnected amorphous carbon derived from polymers. The cage-like porous carbon microspheres could not only accommodate the volume expansion of silicon but also ensure a robust electrical contact, fast transport for electrons and ions. Therefore, the silicon/carbon anode exhibits a high capacity of 1325 mAh g −1 at 0.2 A g −1 after 60 cycles and superior rate capability with a capacity of 925 mAh g −1 at a large current density of 5 A g −1.

Original languageEnglish
Pages (from-to)424-431
Number of pages8
JournalCarbon
Volume127
DOIs
Publication statusPublished - 1 Feb 2018

ASJC Scopus subject areas

  • Chemistry(all)

Cite this