Graphite microspheres decorated with Si particles derived from waste solid of organosilane industry as high capacity anodes for Li-ion batteries

Jing Yu, Hanhui Zhan, Yanhong Wang*, Zailiei Zhang, Han Chen, Hong Li, Ziyi Zhong, Fabing Su

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

We report the decoration of commercial graphite microspheres (GMs) with Si particles as anode materials for Li-ion batteries. The Si particles are obtained from solid Si waste of organosilane industry that is acid-washed to remove the impurities and further ground. The GMs with a size of 5-40 μm as main active material, Si particles with a size of 1-10 μm as an additive, and sucrose dissolved in water as a binder are mixed and followed by carbonization to obtain Si/C composites containing graphite, Si, and amorphous carbon generated from sucrose. It is found that the composite containing 60.5 wt% of GMs, 22.1 wt% of Si, and 17.4 wt% of amorphous carbon obtained at 800°C for 5 h shows the best electrochemical performance with a specific capacity of 522.6 mA h g -1 at the current density of 50 mA g-1 and 306.9 mA h g-1 at 500 mA g-1, much higher than those of GMs. Its capacity retention at 500 mA g-1 attains 93.9% after 20 cycles. The work demonstrates the possibility for utilization of the industrial Si waste to enhance graphite anode materials in Li-ion batteries.

Original languageEnglish
Pages (from-to)112-119
Number of pages8
JournalJournal of Power Sources
Volume228
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Electrochemical performance
  • Graphite
  • Lithium-ion batteries
  • Silicon waste
  • Silicon/carbon composite anode

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