Fabrication of graphene nanoplatelets-supported SiOx-disordered carbon composite and its application in lithium-ion batteries

Mingqi Li, Yan Yu, Jing Li, Baoling Chen, Aishuak Konarov, P. Chen

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Developing high-capacity electrode materials is critical to enhance the energy-density of lithium-ion batteries. Here, a new graphene nanoplatelets-supported SiOx-disordered carbon composite (SiOx-C/GNPs) is fabricated by a Stöber-type process and high-temperature treatment. When used as an anode for lithium-ion batteries, SiOx-C/GNPs exhibits excellent cycle stability and rate capability even under deep charge-discharge cycling. A stable reversible capacity of about 630 mAh g-1 (calculated on the total mass of the composite) can be achieved at a current density of 100 mA g-1 and the capacity retention is nearly 100% after 250 cycles. Additionally, the plateau voltages of lithium extraction for the composite are only slightly higher than those for the commercial graphite, which ensures the high energy density of the assembled batteries. The superior electrochemical performance of this novel material is due to its unique features: excellent electronic conductivity, short transportation length for both lithium ions and electrons, elastomeric space to accommodate volume changes upon Li insertion/extraction and robust connection between SiOx and GNPs. Crown

Original languageEnglish
Pages (from-to)976-982
Number of pages7
JournalJournal of Power Sources
Volume293
DOIs
Publication statusPublished - Jun 16 2015

Keywords

  • Anode
  • Electrochemical performance
  • Graphene nanoplatelets
  • Lithium-ion batteries
  • Nonstoichiometric silicon oxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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